Home

Safety Precautions - LG HVAC VRF Systems

1. Pressure Range Compressor Fan Ps lt 150kPa 1minute after operation Stop Stop Ps lt 150kPa 1minute before operation Inv Minimum freq STD Comp Off 100RPM 10sec Ps gt 190kPa Inv freq change limite less than 5Hz Ps gt 203kPa Normal Control Copyright 2011 LG Electronics Inc All right reserved 26 og LGE Internal Use Only Only for training and service purposes 3 2 Discharge temperature control B Outdoor unit control Temperature range Compressor Sub cooling EEV IDU EEV Tdis gt 115C SC SH decrease control SH decrease control Tdis gt 108C 5Hz 10sec SC SH decrease control SH decrease control Function Tdis gt 100C Normal control SC SH decrease control SH decrease control SC Sub Cooling SH Super Heating 3 3 Inverter protection control Normal Operation Frequency Down System Stop AC Input Current 33A or less 33A or more 35A or more AC input current is input current of inverter compressor except constant current current pass through noise filter Copyright 2011 LG Electronics Inc All right reserved 27 Only for training and service purposes LGE Internal Use Only Function 3 4 Phase detection B When the product is reversed or missed wiring installation Power line R S T it isn t defect or operate for protection of product function and constant speed compressor M 541 M S1 541 542 M S1 at the same time M S2 at the same time 542 543 M S1 S
2. Warning Please reset Main PCB before starting this function 1 Request installer to set the function during installation 2 In case the function is not used set the dip S W OFF and reset the power 3 If ODU RPM changes cooling capacity may go down Copyright 2011 LG Electronics Inc All right reserved 46 og LGE Internal Use Only Only for training and service purposes Function 4 13 Vacuum Mode This function is used for creating vacuum in the system after compressor replacement ODU parts replacement or IDU addition replacement Vacuum mode setting method Vacuum mode cancellation method ODU power reset Set the DIP S W OFF Vacuum mode cancellation Press the black button Main PCB 5 sec P Vacuum mode setting ODU V V OPEN Main EEV SC EEV OPEN IDU EEV OPEN DIP Switch Settings Warning Please reset Main PCB before starting this function caution ODU operation stops during vacuum mode 4 14 Static pressure compensation mode This function is used for creating vacuum in the system after compressor replacement ODU parts replacement or IDU addition replacement High static pressure mode Set DIP S W Static pressure compensation mode setting Static pressure compensation mode cancellation method method Set the DIP S W ON DIP switch OFF Static pressure compensation mode is set Static pressure compensation mode is cancelled DIP Switch Settings Warni
3. ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 87 1 EEPROM bad contact wrona insertion Master 871 Fan PCB EEPROM Error occurs when checking the gi Slave1 872 Error EEPROM checksum as initializing 2 EEPROM Version is different Slave 873 after power is supplied 3 ODU fan PCB assembly damage E Error Diagnosis and Countermeasure Flow Chart No 1 Check EEPROM insertion direction connection condition 2 Check EEPROM checksum gt Replace EEPROM if abnormality found Is EEPROM insertion normal Yes No Is Fan PCB assembly normal Replace fan PCB assembly Yes Recheck power and installation condition Fan EEPROM insertion Inverter EEPROM insertion direction Same direction both socket hole and EEPROM hole Note Replace after power off Copyright 2011 LG Electronics Inc All right reserved 126 Only for training and service purposes LGE Internal Use Only Error No Error Type Error Point 104 Master 11 gt 041 Slave1 12 gt 042 Slave2 13 gt 043 Master displays ODU number which is not communicated Slave displays own error number Communication Error Between Outdoors Error Diagnosis and Countermeasure Flow Chart Is communication cable installed normally No Yes Is Slave Unit Dip SW setting done Dip SW setting Is main PCB power supplied Replace mai
4. Scarcity of Refrigerant 629 Charge the refrigerant by using Refrigerant Auto Charging Function Impossible to Judge 639 IF the system is not in order check the other problem except refrigerant Copyright 2011 LG Electronics Inc All right reserved 40 iz LGE Internal Use Only Only for training and service purposes Function 4 8 Pump Down This function gathers the refrigerant present in the system to ODU Use this function to store refrigerant of system in ODU for leakage or IDU replacement Close liquid SVC v v of each unit Open gas SVC v v of each unit Power Reset after Master Unit Dip switch setting Refer to Dip switch setting page ODU SVC V V Setting Press the black button Liquid Pipe Gas Pipe Satisfy low pressure target Note 2 Yes ODU SVC V V Setting Note 1 Low pressure lt 229kpa Pump down completed Ki Ji Close Close Liquid Pipe Gas Pipe Note If Em is displayed close gas SVC V V of all ODU immediately If low pressure descends below 229 kPa the system turns off automatically Close the gas SVC V V immediately A Caution 1 Use pump down function within guaranteed temperature range IDU 20 32C ODU 5 40C 2 Make certain that IDU doesn t run with thermo off mode during operation 3 Maximum operation time of pump down function is 30 min in case low pressure doesn t go down 4 Press black red button during operation to end pump down IDU ODU off w
5. 2 Heating mode Tc can be set by initial dip switch setting Normal mode capacity up mode and energy save mode Note By setting dip switch Te and Tc are decided simultaneously 6 A LG Constant Speed Fuzzy control start Compressor Target inear Contro 2 C E E E W x E A Constant Speed Constant Speed Compressor Compressor Constant Speed Constant Speed Constant Speed Compressor Compressor Compressor B B Cooling and heating load System Capacity Min frequency Stop 0Hz Fuzzy Control Inverter linear control as cooling and heating load increasing Copyright 2011 LG Electronics Inc All right reserved 20 og LGE Internal Use Only Only for training and service purposes Function 1 3 Master and slave Unit s EEV control 1 Main EEV control Main EEV operates with fuzzy control rules to keep the degree of super Heat Superheat about 3 C at the evaporator outlet stable during heating mode The degree of Superheat Tsuction Tevaporation Tsuction temperature at suction pipe sensor C Tevaporation evaporation temperature equivalent to low pressure C 2 Subcooling EEV control about 15 C Subcooling EEV works with fuzzy rules to keep the degree of Subcool at the outlet of subcooler during cooling mode The degree of Subcool Tcondensation Tliquid Tliquid temperature at outlet of subcooler C Tcondensation condensation temperature equivalent to high pres
6. Instant Over Current Peak of Master Outdoor Unit PFC Instant Over Current Peak of Master Outdoor Unit PFC Instant Over Current Peak of Slave Outdoor Unit PFC Instant Over Current Peak of Slave1 Outdoor Unit PFC Instant Over Current Peak of Slave2 Outdoor Unit PFC Instant Over Current Peak of Slave2 Outdoor Unit PFC Master Outdoor Unit Fan CT Sensor Error Slave1 Outdoor Unit Fan CT Sensor Error 3 Slave2 Outdoor Unit Fan CT Sensor Error Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes Master Outdoor Unit Fan CT Sensor open or short Slave1 Outdoor Unit Fan CT Sensor open or short Slave2 Outdoor Unit Fan CT Sensor open or short ff LGE Internal Use Only Self diagnosis function Copyright 2011 LG Electronics Inc All right reserved Error Slave2 Outdoor Unit Main PCB EEPROM Error Master Outdoor Unit Fan PCB EEPROM Error Slave1 Outdoor Unit Fan PCB EEPROM Error Slave2 Outdoor Unit Fan PCB EEPROM Error Only for training and service purposes Display Title Cause of Error Master Outdoor Unit Fan DC Link High Master Outdoor Unit Fan DC Link High Voltage Error Voltage Error 7 6 Slavet Outdoor Unit Fan DG Link High gjavet Outdoor Unit Fan DC Link High Voltage Error Voltage Error Slave Outdoor Unit Fan DG Link High gjave2 Outdoor Unit Fan DC Link High V
7. Master model code gt Slave1 model code gt Slave2 model code gt total capacity gt 2 gt 25 gt 140 1 255 Master model code 1 255 Slave1 model code 1 255 Slave2 model code 1 255 Slave3 model code 8 42HP HP number sum of master capacity and slave capacity No display cooling only 2 heat pump 25 normal 140 Model Type ARUN BT3 Example 28Hp R410A 15 gt 15 gt 28 gt 2 gt 25 gt 140 Refer to table code caution Product may not properly operate if the relevant DIP switch is not properly setup Model Code Model Code Unit HP 12 Copyright 2011 LG Electronics Inc All right reserved 53 og LGE Internal Use Only Only for training and service purposes Test Run Setting the DIP switch Heat pump If you set the Dip switch when power is on the changed setting will not be applied immediately The changed setting will be enabled only when Power is reset or by pressing Reset button Index 112131 41 516171819110 11 121 131 14 Heating capacity up IDU Fan RPM Control Auto charging Refrigerant Checking Function Integrated test operation function Cooling Integrated test operation function Heating Inverter backup Unit backup Non operation indoor unit EEV adjustment Indoor unit target subcooling overheating adjustment Operation indoor unit EEV adjustment Dry contact Snow removal fuction Forced defrost Snow removal Forced defrost Forced overall def
8. Replace Main or Slave PCB Yes End In order to check communication cables between outdoor units check in order as below PCB connectors terminal block s communication cables Copyright 2011 LG Electronics Inc All right reserved 111 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error Type Error Point Main Reasons 50 1 Power cable or communication cable is not Communication error Main controller of Master Master 521 unit of Master unit can t connected between Slave1 522 receive signal from 2 Defect of outdoor Main fuse Noise Filter Slave2 533 Inverter PCB gt Main PCB inverter controller 3 Defect of outdoor Main inverter PCB Error diagnosis and countermeasure flow chart Is communication LED Yellow of inverter compressor PCB on No Is noise filter or fuse normal No ee Replace noise filter or fuse Yes Is communication cable connected correctly Yes No Is MAIN PCB normal Yes No Re connect communication cable Yes Replace inverter compressor PCB The method of checking MAIN PCB and inverter compressor PCB If normal communication LED blinks TE re nae TI Donor opis communication connector amp communication connector amp LED in MAIN PCB LED in inverter compressor PCB bk AJ AE Copyright 2011 LG Electronics Inc All right reserved 112 og LG
9. 2011 LG Electronics Inc All right reserved 130 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error No Error Type Error Point Main Reasons 115 Master Defective temperature sensor con Uele DIDE Abnormal sensor resistance value hae Slave1 condenser temperature Open Short Defective temperature sensor 12 gt 132 sensor error Open Short Open Short Slave2 13 gt 133 Defective outdoor unit PCB Error No Error Type Error Point Main Reasons 115 Master Defective temperature sensor con 414 151 Outdoor Unit Subcooling rm necter connection Slave1 Outlet Temperature Sensor cach a resistance VALS 2 Defective temperature sensor 12 gt 152 Error Open Short Open Short Slave2 13 gt 153 Defective outdoor PCB E Error diagnosis and countermeasure flow chart Is temperature sensor No connector connections Check and correct connection are normal Yes Is the value of temperature No uns sensor resistance normal p Yes Replace outdoor unit PCB Sensor resistance 100 kQover open or 100 Q below short will generate error Note Temperate sensor resistance vary with temperature So compare temperature sensor resistance value according to outdoor unit temperature by referring below table 5 tolerance Air temperature sensor 10 C 20 7kQ 25 C 10kQ 50 C 3 4kQ Pipe temperature sensor 10 C 10kQ 25 C 5KQ 50
10. No Is SVC valve open Yes Is this error appeared again after reset Is high pressure more than 2500kPa at manifold gauge No Yes Yes Is high pressure of LGMV similar as at manifold gauge No Yes Check pipe is blocked or not and take measure Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes Connect securely Is high pressure switch N No terminal short Replace high pressure switch Note 2 Note 1 High pressure switch connector on Main PCB Main PCB Open SVC valve Yes Replace connecting cable Re check momentary problem or not Replace PCB Note 2 Check short with high pressure switch connector CH24 inverter compressor PCB CH109 154 sub unit PCB Replace high pressure sensor 96 LGE Internal Use Only Troubleshooting Guide Error Type Error Point Main Reasons 25 Master 251 Input voltage is over limited 1 Input voltage abnormal R S T Slave1 Input Voltage high low value of the product 140V 2 Outdoor unit inverter PCB assembly dam 252 or less 300V or more age input voltage sensing part Slave2 253 E Error Diagnosis and Countermeasure Flow Chart Are there any power wire connections normal Check Yes 4 R S S T T R phase voltage is 220V 10 Is input voltage normal Check connection condition and wiring if power is abnormal 1 Chec
11. C 1 8kOQ Copyright 2011 LG Electronics Inc All right reserved 131 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 151 Master Away reversing valve 11 511 y 9 Function error of 4way reversing valve in Main or Slave outdoor units Function error of outdoor 1 Wrong operation of 4way valve because of sludge etc inflow 2 No pressure difference because of compressor fault 3 Wrong installation of In outdoor common pipe 4 Defect of 4way valve Error diagnosis and countermeasure flow chart Is 4 Way valve connecter connection are properly connected No Yes Is 4 Way valve coil No resistance normal Yes is 4 way valve coil connected __N to 4 way valve normally Yes In case of more than 2 units does master outdoor unit recognize as more than 2 units No Yes After reset can we check supply voltage at PCB when starting heating mode operation No Yes Is compressor working No normally Yes After opposite mode operation to present mode is the same error occurred again No Yes Replace 4 way valve Copyright 2011 LG Electronics Inc All right reserved 132 Only for training and service purposes Reconnect it Change 4 Way valve coil Re insert 4 way valve coil Refer to CH 5
12. Ceiling Concealed Duct High Static ARNUO73TJ 2 ARNU093TJ 2 ARNU123TJ 2 Ceiling Cassette 4Way ARNUO53TR 2 ARNUO73TR 2 ARNUO93TR 2 ARNU123TR 2 ARNU153TQ 2 ARNU183TQ 2 A Basic C Plasma ARNU363TN 2 ARNU423TM 2 ARNU483TM 2 ARNUO093TN 2 ARNU123TN 2 ARNU153TN 2 ARNU073BHA2 ARNU363BGA2 ARNUO93BHA2 ARNU423BGA2 ARNU123BHA2 ARNU483BRA2 ARNU153BHA2 URNU763B8A2 ARNU183BHA2 URNU963B8A2 ARNU243BHA2 ARNU153BGA2 ARNU283BGA2 ARNU183BGA2 ARNU243BGA2 Wall Mounted ARNUO73SE 2 ARNU153SE 2 ARNUO093SE 2 ARNU183 5 2 ARNU123SE 2 ARNU243S5 2 A Basic L Plasma ARNU183TM 2 ARNU243TM 2 ARNU243TP 2 ARNU283TP 2 A Basic C Plasma ART COOL Mirror ARNUO73SE 2 R Mirror ARNU093SE 2 _ V Silver ARNU123SE 2 B Blue ARNU153SE 2 ARNU18358 2 ARNU243S8 2 Ceiling Concealed Duct Low Static ARNU073B1G2 ARNU153B1G2 ARNU093B1G2 ARNU183B2G2 ARNU123B1G2 ARNU243B2G2 Ceiling Concealed Duct Built in ARNU073B3G2 ARNU153B3G2 ARNU093B3G2 ARNU183B4G2 ARNU123B3G2 ARNU243B4G2 Floor Standing With case ARNUO073CEA2 ARNUO093CEA2 ARNU123CEA2 ARNU153CEA2 ARNU183CFA2 ARNU243CFA2 Ceiling amp Floor ARNU093VEA2 ARNU123VEA2 Ceiling Suspended URNU183VJA2 URNU243VJA2 Without case ARNU073CEU2 ARNUO093CEU2 ARNU123CEU2 ARNU153CEU2 ARNU183CFU2 ARNU243CFU2 Vertical AHU ARNU183NJA2 ARNU243NJA2 ARNU303NJA2 ARNU363NJA2 ARNU423NKA2 ARNU483NKA2 ARNU5S43NKA2 Ceiling Cassette 2Way ARNU183TL 2 A
13. Compressor1 Discharge Temperature Sensor Fault Slave2 Outdoor Unit Constant Speed Compressor 1 Discharge Temperature Sensor open or short 10149 pejeje yun JOOPINQ A Master Outdoor Unit Constant Speed Compressor2 Discharge Temperature Sensor Fault Master Outdoor Unit Constant Speed Compressor 2 Discharge Temperature Sensor open or short Slave1 Outdoor Unit Constant Speed 4 Compressor2 Discharge Temperature Sensor Fault Slave1 Outdoor Unit Constant Speed Compressor 2 Discharge Temperature Sensor open or short Slave2 Outdoor Unit Constant Speed Compressor2 Discharge Temperature Sensor Fault Slave2 Outdoor Unit Constant Speed Compressor 2 Discharge Temperature Sensor open or short Master Outdoor Unit Faulty IPM Temperature Sensor Master Outdoor Unit IPM Temperature Sensor short open Slave1 Outdoor Unit Faulty IPM Slave1 Outdoor Unit IPM Temperature Sensor short open Temperature Sensor Slave2 Outdoor Unit Faulty IPM Slave2 Outdoor Unit IPM Temperature Sensor short open Temperature Sensor Copyright 2011 LG Electronics Inc All right reserved 75 lt LGE Internal Use Only Only for training and service purposes Self diagnosis function Display O F Q O O 5 D F D Q D O Copyright 2011 LG Electronics Inc All right reserved Omitting connection of R S T power of Master Outdoor Unit Cause of Error Omitting connection of Master
14. Only for training and service purposes LGE Internal Use Only ARUN Series e Function asranrnnnvnnnnnennnnnneunnnnnnuneunnunnnunnunnnunnunnunnnunnunnuunuunnuuuunnuun 19 Copyright 2011 LG Electronics Inc All right reserved 18 F LGE Internal Use Only Only for training and service purposes Function i Function Te BASIC CON ON Edet 20 1 1 Normal operation EEE EEE EE 20 ETL 20 1 3 Master and slave unit s EEV NN 21 2 SPECIA COMO raae e a EEE 22 EMNE 22 22 NISMO SE OM Le 24 2S SOP Operaio EE OE NE eee ee 25 2 ENN 25 BOLE CUO CO MENON cinsine E E 26 3 1 Pressure NENNE MM 26 3 2 Discharge temperature control aaneen enne ernene eere nnnreneersenrenrrenneenenrnenrnen 27 3 3 NET NENNE 27 PENN 28 3 5 Pressure Nm rsNede te 28 A ONE ON 29 TF EEEE o EAEE N E A A E AS A TE A T 29 AZ ETEN ANN 31 2 ST TENNE 32 4 4 Refrigerant Auto Charging rarrrrnrnnnrvrrnnnrrrnnnnevrnnnnennnnnnennnnernnrnnnsennnnssnnrnnssennnsnennnnnnee 35 4 5 Refrigerant Checking Nr 37 4 6 IDU EEV Abnormal Checking Function arseen serenade ne Aelia 39 4 7 Integrated Test Runing Function Cooling MOde ccccccseecceeeeeeeeseeeeeesaeeeeesaeeeees 40 4 8 Integrated Test Runing Function Heating Mode ccsscccssecceececeeeecseeeeeeseneeeens 41 4 8 Auto Back Up Function Inverter compressor anna an enen enen eener enerenrnnnrenensnn 41 4 9 PUMO DOWN zene nieeenke teens EEEE a NERA EEEE EEn EE EEA 43 ATO PUp Sn 44 4 11
15. Resistance value of discharge temperature sensor 10 C 362kQ 25 C 200kQ 50 C 82k 100 C 18 5kQ Is EEV in outdoor unit normal No at heating operation Replace outdoor unit EEV refer electric component part Yes Pere aquia rn NO Check liquid injection ke corresponded operate normally Yes Is there pipe No Check another components strainer etc clogging and operation conditions l l Take measures Yes Replace strainer Copyright 2011 LG Electronics Inc All right reserved 103 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error Type Error Point Main Reasons 1 Defect of high pressure sensor 2 Defect of indoor or outdoor unit fan 34 Error happens 3 Deformation because of damage of refrigerant pipe because of 3 times 4 Over charged refrigerant oma Overinerease ordis S a 5 Defective indoor outdoor unit EEV Slave1 en NE increase of high pres pr Kaen 342 compressor ee Outdoor unit is blocked during cooling Indoor unit filter is blocked during heating Slave2 sensor 343 7 SVC valve is clogged 8 PCB defect of outdoor unit 10 Indoor unit pipe temperature sensor defect Error diagnosis and countermeasure flow chart No Is service valve opened Open service valve Yes Are communication cable pipe connection normal No Check and repair communication cable pipe connection Yes Is refrigerant amount no
16. main PCB of Slave1 Outdoor Unit Communication Error Between Slave2 Outdoor Unit and Other Outdoor Unit Failing to receive master and other Slave Unit signal at main PCB of Slave2 Outdoor Unit Master Outdoor Unit Fan PCB Communication Error Failing to receive fan signal at main PCB of master unit Slave1 Outdoor Unit Fan PCB Communication Error Failing to receive fan signal at main PCB of Slave1 unit Slave2 Outdoor Unit Fan PCB Communication Error Failing to receive fan signal at main PCB of Slave2 unit Master Outdoor Unit FAN IPM Fault Error Instant Over Current at Master Outdoor Unit Fan IPM Slave1 Outdoor Unit FAN IPM Fault Error Instant Over Current at Slave1 Outdoor Unit Fan IPM 10119 pajejen HUN JOOPINQ Slave2 Outdoor Unit FAN IPM Fault Error Instant Over Current at Slave2 Outdoor Unit Fan IPM Master Outdoor Unit Fan DC Link Low Voltage Error Master Outdoor Unit Fan DC Link Input Voltage is under 140V Copyright 2011 LG Electronics Inc All right reserved Slave1 Outdoor Unit Fan DC Link Low Voltage Error Slave2 Outdoor Unit Fan DC Link Low Voltage Error Master Outdoor Unit Liquid pipe Temperature Sensor Error Slave1 Outdoor Unit Liquid pipe Temperature Sensor Error Slave2 Outdoor Unit Liquid pipe Temperature Sensor Error Only for training and service purposes Slave1 Outdoor Unit Fan DC Link Input Voltage is under 140V Slave2 Outdo
17. 7 25 C 2 Check insulation resistance between compressor terminal and pipe over 50M Replace compressor if abnormality found Are the resistance Between each phase and insulation resistance of Inverter compressor normal 1 Check inverter PCB assembly U V W connector connection condition Is compressor 2 Check wire disconnection and wiring Wire connection 3 Check compressor terminal connection condition condition normal bad contact gt Reassemble if abnormality found Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly Is inverter PCB assembly normal Yes Recheck power and Dinstallation condition Copyright 2011 LG Electronics Inc All right reserved 98 iz i LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Measuring resistance between each terminal of compressor Copyright 2011 LG Electronics Inc All right reserved 99 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 28 Master 281 Slave1 1 Input voltage abnormal R S T 2 ODU inverter PCB damage Inverter DC link high Inv PCB DC link voltage voltage error lied over 420V 282 9 pe DC Link voltage sensing part Slave2 283 E Error Diagnosis and Countermeasure Flow Chart 1 Check R S T wiring conditions 2 Check Noise filter wiring c
18. Auto Back Up Function Inverter COMPIeSSOM cccssccececeeeceeceeeseseceeeaeeceeeseeeaees 46 4 12 Auto Back Up Function_constant speed compressor annae enen eenenen 47 41 NOE NE Fra 48 2 AGU MOOG EEE EE E 49 4 15 Static pressure compensation MOdDe rrrrrrrarrrvnnnrnrannevnnnrrvnnnenrnnsennannennanennaneennnssnn 49 TOPP E E E E 50 Copyright 2011 LG Electronics Inc All right reserved 19 iz LGE Internal Use Only Only for training and service purposes Function 1 Basic control a i 1 1 Normal operation Cooling operation Heating operation Stop state Fuzzy control Fuzzy control Fuzzy control Fuzzy control Main EEV Full open Fuzzy control Min pulse e Normal minimum pulse Subcooling Fuzzy control e Avoiding control of high Min pulse EEV discharge temperature Indoor Unit Superheat fuzzy Subcooling fuzzy control Min pulse Note Heating operation is not functional at an outdoor air temperature of 24 C or more Cooling operation is not functional at an outdoor air temperature of 2 C or less with indoor unit combina tion of 10 or less 1 2 Compressor control Fuzzy control Maintain evaporating temperature Te to be constant on cooling mode and condensing tem perature Tc on heating mode by Fuzzy control to ensure the stable system performance Tc 47 51 C Te 2 5 C 1 Cooling mode Te can be set by initial dip switch setting Normal mode capacity up mode and energy save mode
19. Covering EEV defect Ref overcharge 2 Compressor damage Insulation Inverter PCB input 3 phase power damage Motor damage current is over 50A peak for 2ms 3 Input voltage abnormal R S T 4 Power line assemble condition abnormal 5 Inverter PCB assembly damage input current sensing part E Error Diagnosis and Countermeasure Flow Chart No Is installation condition normal Yes No Is input voltage normal Yes No Is AC input Wire connection condition normal Yes No Is compressor Wire connection condition normal Yes No Is inverter PCB assembly normal Yes Recheck power and installation condition Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found Check R S S T T R phase voltage is 220V 10 gt Check connection condition and wiring if power is abnormal 1 Check R S T connection condition 2 Check wire disconnection and wiring gt Reassemble if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Check inverter PCB assembly IPM norm
20. Do not directly turn off the main power switch after stopping operation e Wait at least 5 minutes before turning off the main power switch Otherwise it _ or other problems Use a firm stool or ladder when cleaning or maintaining the air conditioner e Be careful and avoid personal injury mA Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes Safety Precautions Turn on the power at least 6 hours before starting operation Starting operation immediately after turning on the main power switch can result in severe damage to internal parts Keep the power switch turned on during the operational season Do not operate the air conditioner with the panels or guards removed e Rotating hot or high voltage parts can cause injuries Auto addressing should be done in condition of connecting the power of all indoor and outdoour units Auto addressing should also be done in case of changing the indoor unit PCB WTS Jr Do not insert hands or other objects through the air inlet or outlet while the air conditioner is plugged in T
21. Pipe outlet temp sensor PCHGETOASM AH V ASREGBTIAYOGG2 217 E CN PIPE1 Pipe inlet temp sensor GA TATASEET 2 LL Measure the resistance of outlet pipe temp sensor Copyright 2011 LG Electronics Inc All right reserved 82 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 1 Remote controller fault The remote controller No communication between cabled did not receive the sig 2 Indoor unit PCB fault remote controller amp indoor unit nal from indoor unit 3 Connector fault Wrong connection during specific time 4 Communication cable problem Error diagnosis and countermeasure flow chart Does the error happens again if the remote controller is replaced Replace cabled remote controller Does the error occurred when the cable of remote controller is replaced Check connection amp communication cable Replace indoor unit PCB If there is no remote controller to replace Use another unit s remote controller doing well Check cable Contact failure of connected portion or extension of cable are main cause Check any surrounded noise check the distance with main power cable gt make safe distance from the devices generate electromagnetic wave After replacing indoor unit PCB do Auto Addressing amp input unit s address if connected to central controller All the indoor u
22. between coil terminal Replace EEV Outdoor short or red white red yellow red orange red blue unit misconnection 2 If the estimated resistance value is in 52 30 then the EEV is normal 1 Check the resistance between coil terminal Replace EEV brown white brown yellow brown orange brown blue 2 If the estimated resistance value is in 150 10Q then the EEV is normal Full closing 1 Operate indoor unit with FAN mode and operate another If the amount of Indoor valve leakage indoor unit with COOLING mode leakage is much unit 2 Check indoor unit FAN mode liquid pipe temperature Replace EEV from operation monitor of outdoor unit control board 3 When fan rotate and EEV is fully closed if there is any leakage then the temperature is down If estimated temperature is very low in comparison with suction temperature which is displayed at remote controller then the valve is not fully closed Copyright 2011 LG Electronics Inc All right reserved 62 iz i LGE Internal Use Only Only for training and service purposes Checking Method for Key Components 2 4 Phase Bridge Diode Internal circuit diagram Nppearance R S T o Ik ao 2 1 Wait until inverter PCB DC voltage gets discharged after the main power switch off 2 Pull out all the connectors connected with 3 phase bridge diode 3 Set multi tester in diode mode 4 Measured value should be 0 4 0 7V measuring as below table 5 In case the measu
23. compressor if not preheating the crank case with the electrical heater for more than 4 hours In case of the outdoor temperature below 10 C caution Preheat of compressor Start preheat operation for 4 hours after supplying main power In case that the outdoor temperature is low be sure to supply power 4 hours before operation so that the heater is heated insufficient heating may cause damage of the compressor Copyright 2011 LG Electronics Inc All right reserved 50 og LGE Internal Use Only Only for training and service purposes Test RUn 2 How to cope with Test Run abnori The phenomena from main component failure Component Phenomenon Check method and Trouble shooting Compressor Outdoor fan Not operating Motor insulation broken Check resistance between terminals and chassis Strainer clogged Change strainer Oil leakage Check oil amount after opening oil port Stop during running Check resistance between terminals and chassis Motor insulation failure Abnormal noise during running High pressure error at cooling R S T misconnection Check compressor R S T connection Motor failure Check the outdoor fan operation after being bad ventilation around turned the outdoor units off for some time outdoor heat exchanger Remove obstacles around the outdoor units Outdoor EEV Heating failure fre quent defrosting No operating sound at applyin
24. manage if abnormality found Is installation condition normal 1 Check resistance between each terminal of compressor U V 0 1790 7 V W 0 1780 7 W U 0 1780 7 25 C 2 Check insulation resistance between compressor terminal and pipe over 50M Are the resistance Between each phase and insulation resistance of Inverter compressor normal No Replace compressor if abnormality found Yes 1 Check inverter PCB assembly U V W connector connection condition No 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Is compressor Wire connection condition normal Yes No Check connection between inverter PCB assembly and bridge diode misconnection disconnection gt wiring again if abnormality found Is inverter PCB assembly power connection normal Yes No Check Is input voltage normal R S S T T R phase voltage is 220V 10 Check connection condition and wiring if power is abnormal No Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly Yes Is inverter PCB assembly normal Yes Recheck power and installation condition Copyright 2011 LG Electronics Inc All right reserved 92 iz i LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Measuring resistance between Inverter PCB
25. occurs and if valve is closed noise occurs Noise from EEV can be confirmed by touching the EEV surface with a screw driver and listening the Full open EEV noise 1950 pulses If liquid refrigerant is in EEV the noise is lower Copyright 2011 LG Electronics Inc All right reserved 60 og LGE Internal Use Only Only for training and service purposes Checking Method for Key Components EEV Coil and body Outdoor unit J Lead wire Coil l Remove and assemble the coil Remove Assemble Grip the A part tightly and pull up coil part upward When the coil part is removed or assembled be careful not to bend the pipe of the body Copyright 2011 LG Electronics Inc All right reserved 61 lt LGE Internal Use Only Only for training and service purposes Checking Method for Key Components e EEV failure check method Diagnosis Repair process Unit Microcomputer Driving circuit failure 1 Disconnect the EEV connector form control board and Check and replace Indoor connect testing LED Indoor unit control unit board 1K 2 Main power ON pulse signal is out from EEV for 17 sec If LEDs do not turn on or are in on state continuously then driving circuit is abnormal EEV locking 1 If EEV is locked in no load state the driving motor rotate Replace EEV Indoor and clicking sound always occurs Outdoor unit EEV Motor coil 1 Check the resistance
26. outdoor PCB 49 Outdoor Unit IPM Outdoor Unit IPM Bad connection of air temperature connector ee pe Temperature Temperature Sensor 2 Defect of air temperature connector Open Short Slave 493 Sensor Fault Open or Short Defect of outdoor PCB E Error diagnosis and countermeasure flow chart Is sensor connected to PCB correctly Connect sensor to PCB correctly Yes If value is 100kQ T open or 1000 short error occurs Replace corresponding outdoor unit PCB Error No Error Type Error Point Main Reasons NB Resistance value of temperature sensor change according to temperature It is normal if value shown as below 5 error Sensor of air temperature 10 C 20 7kQ 25 C 10kQ 50 C 3 4kO Sensor of piping temperature 10 C 10kQ 25 C 5Ok 50 C 1 8kQ 153 Outdoor Unit Outdoor Unit Upper 1 Temperature Sensor Connecting Fault Master 11 gt 531 Upper Heat PP p g Heat Exchanger 2 Temperature Sensor Open Short Slave1 12 gt 532 Exchanger Temperature Sensor 3 Main PCB Fault Temperature Slave2 13 gt 533 Sens r Fait open or short 154 Outdoor Unit Low Outdoor Unit Low Master 11 gt 541 Heat Exchanger Heat Exchanger Slave1 12 gt 542 Temperature Sensor Temperature Sensor Slave2 13 gt 543 Fault open or short 1 Temperature Sensor Connecting Fault 2 Temperature Sensor Open Short 3 Main PCB Fault Copyright 2011 LG Electronics Inc All right rese
27. over 30C air temperature Hot gas bypass valve OFF After 15 min 2 4 Oil equalizing control This function prevent oil unbalance between inverter compressor and constant speed compressor Compressor discharge temperature Compressor oil temperature Standard oil temperature Compressor oil temperature Compressor oil balance temperature where the end of capi Copyright 2011 LG Electronics Inc All right reserved 25 iz LGE Internal Use Only Only for training and service purposes Function 3 Protection control 3 1 Pressure protection control 3 1 1 Pressure control on cooling mode B High pressure control Pressure Range Compressor Fan Pa 4003 kPa Stop Stop Pa gt 3807 kPa 5Hz 4sec 100RPM 4sec Pa gt 3644 kPa Frequency holding Normal control Pa lt 3644 kPa Normal control B Low pressure control Pressure Range Compressor Ps lt 150kPa 1 minute later operation Stop Ps lt 346kPa 1 minute before operation 5Hz 4s 100RPM 4sec Ps lt 399kPa Normal control Frequency holding N ZA s Frequency holding frequency or RPM is not increasing can decrease 3 1 2 Pressure control on heating mode B High pressure control Pressure Range Compressor Fan Pa 4003 kPa Stop Stop Pa gt 3415 kPa 5Hz 4sec 50RPM 4sec Pd gt 3317 kPa Normal control Frequency holding Pa lt 3317 kPa Normal control Pa lt 3284 N control
28. the difference of the outputs of high and low pressure is in the range of 1kg cm the pressure sensor is normal 3 If the difference of the outputs of high and low pressure is over 1kg cm the pressure sensor is out of order it need to be replaced 4 The composition of pressure sensor High Pressure Sensor 0 5MPa Vout 0 5 3 5V Low Pressure Sensor 0 2MPa Vout 0 5 3 5V Red VC DCSV 15 Vout White GND Black The pressure sensor is composed like the circuit picture shown above If DC 5V voltage flows on red and black wire voltage would be made between the white and black wire The pressure which is equivalent to the pressure output is shown in the table above 2 9 Outdoor Fan l _ 1 The outdoor fan is controlled by the inverter motor which can control the number of rotations 2 The outdoor fan is controlled by the high low pressure of the outdoor unit after the operation of compressor 3 There is possibility that the outdoor fan does not operate due to low capacity operation or low outdoor tempera ture even if the compressor is operating This does not mean breakdown of the unit the fan will start operating if it reaches the set point Copyright 2011 LG Electronics Inc All right reserved 67 ge LGE Internal Use Only Only for training and service purposes Checking Method for Key Components 2 10 Solenoid Valve Check the conformity of the operation of solenoid valve to the output sigh
29. usually happens after on boarding Mixing Installation of Old Sub Outdoor Unit and New Slave Outdoor Unit 76 LGE Internal Use Only Display Inverter PCB EEPROM Error of Master Outdoor Unit Inverter PCB EEPROM Error of Slave1 Unit Self diagnosis function Cause of Error Access Error of Inverter PCB of Master Outdoor Unit Access Error of Inverter PCB of Slave1 Outdoor Unit Inverter PCB EEPROM Error of Slave2 Unit Access Error of Inverter PCB of Slave2 Outdoor Unit Master Outdoor Unit Fan Lock Restriction of Master Outdoor Unit Slave1 Outdoor Unit Fan Lock Restriction of Slave1 Outdoor Unit Slave2 Outdoor Unit Fan Lock Restriction of Slave2 Outdoor Unit Constant1 CT Sensor Error of Master Outdoor Unit Constanti CT Sensor open or short of Master Outdoor Unit Constanti CT Sensor Error of Slave Outdoor Unit Constanti CT Sensor open or short of Slave1 Outdoor Unit Constant1 CT Sensor Error of Slave2 Outdoor Unit Constanti CT Sensor open or short of Slave2 Outdoor Unit Constant2 CT Sensor Error of Master Outdoor Unit Constant2 CT Sensor open or short of Master Outdoor Unit Constant2 CT Sensor Error of Slave Outdoor Unit O F Q O O c 5 L D ek D Q D O Constant2 CT Sensor open or short of Slave1 Outdoor Unit Constant2 CT Sensor Error of Slave2 Outdoor Unit Constant2 CT Sensor open or short of Slave2 Outdoor Unit
30. 1 amp make measure Replace outdoor unit PCB Check and replace compressor Magnet switch corresponding PCB refer electric component part If the same error is occurred in near future replace 4way valve LGE Internal Use Only Troubleshooting Guide Measure the resistance of 4way valve Locanon Gf dway valve connector on Main PCB marked as 4way CN09 oon a NN n j P nan Ca Confirm the 4way valve coil is inserted to the end Check the output voltage of terminal socket during heating operation When power is supplied in order as follow Slave2 gt Slave1 gt Mater ODU information is displayed one after the other at main PCB 7 segment 1 Model ID gt 5HP 60 6HP 61 8HP 62 10HP 63 12HP 64 14HP 65 2 Total Capacity gt Displayed with HP 3 ODU Type gt HEAT PUMP 2 Cooling 0 4 Normal mode 25 5 Refrigerant gt R410a 41 Checking method for outdoor unit of 3unit system Master Slave1 Slave2 Close all the SVC valves of high low pressure common pipe Operate system Check the difference of high and low pressure with LGMV for each unit Master Slave1 Slave2 amp If there is a unit in which the difference is not increased then the 4way valve of that unit is defective Copyright 2011 LG Electronics Inc All right reserved 133 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error No Error Type Er
31. 1 LG Electronics Inc All right reserved 68 og LGE Internal Use Only Only for training and service purposes Checking Method for Key Components 2 11 Reverse Valve a 1 Keep it off before the outdoor unit is powered on and the indoor unit is turned on 2 Cooling defrosting oil recovery OFF heating ON 3 When alternating cooling to heating transform 4 way valve during re starting for 3 minutes 4 To check the mode of cooling heating operation of 4 way valve touch the piping surface of low pressure service valve 5 Refrigerant flowchart of 4 way valve D D E C Indoor Heat gt C S Pipe Outdoor Heat Exchanger E Outdoor Heat Exchanger S Pipe Exchanger Heating Operation Cooling Operation 6 Insulation resistance in the state of connecting the valve to coil should be over 100mQ when measure it with DC mega tester DC 500V 2 12 Temperature Sensor 1 2 3 4 outdoor temperature sensor TH1 Suction pipe S pipe temperature sensor TH2 Discharge pipe D pipe temperature sensor TH3 Outdoor heat exchanger center of condenser temperature sensor TH2 1 Check the condition of installation and the contact of temperature sensor 2 Check whether the connector contact of temperature sensor is normal 3 Measure the resistance of temperature sensor vm S NS TH TH2 TH3 ee ee ee 200KO 1 25 C 1 07K0 3 3 85 C 535K0 3 3 85 C 28KN 7 7 85 C Copyright 2011 LG Electroni
32. 2 at the same time 543 M 501 M S1 501 502 M S1 at the same time M S2 at the same time 502 503 M S1 S2 at the same time 503 M Reversed Phase M S1 231 232 M S1 at the same time M S2 at the same time 232 233 M S1 S2 at the same time 233 Series 3 5 Pressure switch Main has pressure sensing switch in series between compressor and power relay The state of pressure sensing switch is normally on It has small electric current from 220V AC Never touch the connecting terminal with hand nor short two wires directly Copyright 2011 LG Electronics Inc All right reserved 28 iz LGE Internal Use Only Only for training and service purposes Function 4 Other control E 4 1 Initial setup There are 4 initial setup steps before running All DIP switch setting must be completed before initial setup 1 Step 1 factory setting value display Factory setting value is displayed in 7 segment on PCB for 24sec All dip switches must be set properly before step 1 Nm Power Is on Master model code is displayed 3sec Slave1 model code is displayed 3sec Slave2 model code is displayed 3sec Total capacity including sub units is displayed 2sec Heat pump Display 2 is default value Cooling only no display Factory setting 25 is normal Model type Copyright 2011 LG Electronics Inc All right reserved 29 Only for training and service p
33. B1G2 3B1G2 Low Static B2 B3 ARNUO7 ARNUO9 ARNU12 3B3G2 383G2 3B3G2 Built In B4 ee ARNU09 ARNU12 Ceiling amp Floor VE AVEA BVEA Ceiling Suspended VJ Er CE ARNUO07 ARNUO9 ARNU12 With Case oe CF ARNU24 Floor 3CFA2 Standing CE ARNUO7 ARNUO09 ARNU12 Without 3CEU2 3CEU2 3CEU2 Case CF NJ ARNU18 ARNU24 ARNU30 ARNU36 Vertical AHU 3NJA2 3NJA2 3NJA2 3NJA2 NK ARNU42 ARNU48 ARNU54 3NKA2 3NKA2 3NKA2 sx ART COOL SE S8 R Mirror V Silver B Blue Wall Mounted A Basic L Plasma Ceiling Cassette A Basic C Plasma 11 Copyright 2011 LG Electronics Inc All right reserved F LGE Internal Use Only Only for training and service purposes Model Names 1 2 Outdoor Unit Heat Pump ARUN re 8HP 10HP 12HP 14HP 18HP 20HP PPly 6Ton 8Ton 10Ton 12Ton 14Ton 16Ton 30 208 230V 60Hz 072BT3 096BT3 121BT3 144BT3 168BT3 192BT3 22HP Power Supply 18Ton 3 208 230V 60Hz 216BT3 24HP 20Ton 240BT3 26HP 22Ton 264BT3 28HP 24Ton 288B13 312BT3 336BT3 Power Suo 36HP 38HP 40HP 42HP PPly 30Ton 32Ton 34Ton 36Ton 30 208 230V 60Hz 360BT3 384BT3 408BT3 432B13 12 Copyright 2011 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes fl 2 External Appearance External Appearance 2 1 Indoor Unit Ceiling Cassette 1Way
34. DC Link High Voltage Fan PCB DC link voltage supplied 1 Input power abnormal Error over 420V 2 Fan PCB assembly defect 3 Power wire connecting fault Error Diagnosis and Countermeasure Flow Chart Are there any power wire No 1 Check R S T wiring conditions connections normal 2 Check Noise filter wiring conditions gt Rewire them if abnormality found Yes Is input voltage normal No R S S T T R phase voltage is 220V 10 gt Rewire them if abnormality found Yes ls DC Link power normal No 1 Check DC Link wiring conditions gt Rewire them if abnormality found Yes No Is Fan PCB normal 1 Replace Fan PCB Yes DC Link Voltage Connecting Part Recheck power and installation condition eet am js je 148 i ee ee R S T Noise filter input upper part Noise filter output lower part Copyright 2011 LG Electronics Inc All right reserved 122 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error No Error Type Error Point Main Reasons 1 Overload operation Tr 2 Fan Motor defect He Fan Over Current Error Output current is over 10A for 40ms 3 Fan PCB assembly defect Slave 773 4 Fan Motor connector insert defect 5 Condenser icing or blocking E Error Diagnosis and Countermeasure Flow Chart Is installation Check ODU fan motor assemble condition and locking condition normal Reassemble or replace if abnormality fou
35. E Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 1 Communication cables are not connected ati In case Main PCB can t 2 Communication cables are short open ommen on receive signal from indoor 3 Defect of outdoor Main indoor PCB Indoor unit gt Outdoor unit mit 4 ODU IDU Main PCB Damage 5 communication Wire Connection Fault Error diagnosis and countermeasure flow chart Are quantity of indoor units installed same as the data of LGMV Is indoor unit quantity correct after Auto Addressing No Supply power Is power supplied NO to indoor units Yes Replace indoor unit PCB or transmission PCB after check defected indoor Indoor Unit Communication part Wiring Fault Case Communication PCB AMETTTLTG x 1 time 10 sec Turn on off In case of CH53 almost happened with CHO5 the indoor units not operated actually are normal so check with same method of CHO5 and additionally check as shown as below and above flow chart e Although the quantity of indoor units installed is same as LGMV data there may be a few indoor units with which the number of communication is not increased with LGMV Although the quantity of indoor units installed is not same as LGMV data and if communication of the indoor unit displayed at LGMV is done well then the indoor unit suspected to have some problem and is not ap
36. Failure Receiving Signal Master 11 gt 821 Between Main Sub Between Main Sub Micom of Slave1 12 gt 822 Micom of Master Master Outdoor unit Main Slave 13 gt 823 Outdoor unit Main PCB PCB 1 Failure Receiving Signal Between Main Sub Micom of Master Outdoor unit Main PCB Error diagnosis and countermeasure flow chart Sub Micom LED Blinking Press the Reset Button Momentary Error Heat Pump ALI rj mig WER LF 283 485 687 1 2012 495 F Im a PT sk Cu a ba AF Mu Gale Mien ODO OMO ei Sub Micom Copyright 2011 LG Electronics Inc All right reserved 135 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error Type Main Reasons 193 Master 11 gt 931 Fan PCB heatsink Heat sink temperature is over 1 Heatsink temperature sensor defect Slave1 12 gt 932 temperature high 95 C Slave 13 gt 933 2 Fan PCB assembly defect 194 1 Heatsink temperature sensor i defect Open Short Master 11 gt 941 Fan PCB heatsink Heatsink temperature sensor Slave1 12 gt 942 temperature sensor abnormal 2 Wrong connection of temperature sen error sor connector he 3 Fan PCB assembly defect Error diagnosis and countermeasure flow chart No Check connection of heat sink temperature connector No Fan heat sink connection Is temperature sensor inserted to fan PCB Yes Check connection cond
37. Fault 5 IPM Fault Inverter Board Input Over Current RMS of Master Outdoor Unit Inverter Board Input Current excess Master Outdoor Unit RMS Q Bolo Inverter Board Input Over Current RMS of Slave1 Outdoor Unit Inverter Board Input Current excess a Slave1 Outdoor Unit RMS 3 Inverter Board Input Over Current RMS of Slave2 Outdoor Unit Inverter Board Input Current excess Slave2 Outdoor Unit RMS Copyright 2011 LG Electronics Inc All right reserved 71 ge LGE Internal Use Only Only for training and service purposes Self diagnosis function 10149 pajejen JUN JOOPINQ Display Title Master Outdoor Unit Inverter Compressor DC link Low Voltage1 Slave1 Outdoor Unit Inverter Compressor DC link Low Voltage Slave2 Outdoor Unit Inverter Compressor DC link Low Voltage Master Outdoor Unit High Pressure Switch Slave1 Outdoor Unit High Pressure Switch Slave2 Outdoor Unit High Pressure Switch Master Outdoor Unit Input Voltage High Low Voltage Slave1 Outdoor Unit Input Voltage High Low Voltage Slave2 Outdoor Unit Input Voltage High Low Voltage Master Outdoor Unit Inverter Compressor Start Failure Slave1 Outdoor Unit Inverter Compressor Cause of Error DC charging is not performed at Master Outdoor Unit after starting relay turn on DC charging is not performed at Slave1 Outdoor Unit after starting relay turn on DC charging is not performed at Slave2 Outdoor Unit after starting
38. LG Electronics Inc All right reserved 44 iz LGE Internal Use Only Only for training and service purposes Function 4 11 Auto Back Up Function_constant speed compressor This function allows the system to operate in case of constant speed compressor failure by backing up compressor automatically Operation Constant speed comp failure Constant speed Comp Auto Backup ODU Main PCB Display Error Display 173 174 Unit No t 30min delay Constant speed comp permanent back up starts Error clear IDU ODU off Operation possible Example Slave1 Unit constant speed Comp failure No 173 p pa JE ODU Error number A Caution 1 Request SVC immediately if error occurs Copyright 2011 LG Electronics Inc All right reserved 45 Only for training and service purposes LGE Internal Use Only Function 4 12 Night Low Noise Function In cooling mode this function makes the ODU fan operate at low RPM to reduce the fan noise of ODU at night which has low cooling load Max RPM setting method RPM Time Settings Capacity Judgment Operation Step Fan Maximum RPM hr Y 1 9 Y 3 se 6 5 12 7 8 9 v 8 620 780 6 5 10 5 Note 1 Setting Method for Fan Max RPM Noise Step Black Button Red Button Capacity Capacity Hp 8 10 14 Step Max RPM Noise dB Standard 58 62 55 59 o 5 i
39. RNU243TL 2 A Basic C Plasma x These are model names of the basic function Copyright 2011 LG Electronics Inc All right reserved 13 F LGE Internal Use Only Only for training and service purposes External Appearance 2 2 Outdoor Unit 2 2 1 208 230V CHASSIS Model Name ARUNO72BT3 ARUNO96BTS3 ARUN121BT3 ARUN144BT3 ARUN168BT3 ARUN192BT3 ARUN216BT3 ARUN240BT3 ARUN264BT3 ARUN288BT3 ARUN312BT3 ARUNSS6BT3 ARUNS60BT3 ARUN384BT3 ARUN408BT3 ARUN432BT3 Copyright 2011 LG Electronics Inc All right reserved 14 F LGE Internal Use Only Only for training and service purposes Combination of Outdoor Units al 3 Combination of Outdoor Units 3 1 208 230V Model Name ARUNO72BT3 ARUNO096BT3 Capacity HP Ton Number of Units Module HP ARUN121BT3 2 10 ARUN144BT3 4 12 ARUN168BT3 ARUN192BT3 ARUN216BT3 ARUN240BT3 8 14 20 16 ees Nr Nr ee NO 2 18 24 20 N ARUN264BT3 26 22 ARUN288BT3 8 24 ARUN312BT3 26 ARUN336BT3 34 28 ARUN360BT3 36 30 ARUN384BT3 38 32 ARUN408BT3 40 34 ARUN432BT3 42 36 E A maximum of 42HP can be obtained by combining 8 10 12 and 14HP B The biggest module should be master module and others are slaves B Setting method of master slave and position of master in the system is explained in the installation chapter Copyr
40. ace inverter PCB assembly Checking 15V input Fan communication Fan Error LED connection LEDOIM Lo SWO RESET r et Error LED LEDO3M LEDO2M Communication connector Communication LED 5 Pu FAUT R Note Check fan PCB assembly Error LED blinking Check 108x Error Copyright 2011 LG Electronics Inc All right reserved 128 Only for training and service purposes LGE Internal Use Only Error No Error Type ODU Fan PCB IPM Fault No Is fan motor assemble condition normal Yes No Is fan motor wire connection condition normal Yes No Is fan PCB assemble condition normal Yes No Is Fan Heat sink temperature sensor normal Yes No Is fan PCB assembly normal Yes Recheck power and installation condition Fan Motor Wire connection Check assemble condition Troubleshooting Guide Main Reasons 1 Overload operation Pipe clogging Covering EEV defect Ref overcharge IPM protection circuit activation 2 ODU fan motor assemble condition abnormal over current overheating Coil disconnection Short Insulation damage 3 Fan PCB heatsink assemble condition abnormal 4 Fan PCB assembly defect E Error Diagnosis and Countermeasure Flow Chart Check ODU fan motor assemble condition and locking Reassemble or replace if abnormality found 1 Check fan motor U V W connector connection condition Reassemble wire if abnormality f
41. ality gt Replace inverter PCB assembly 119 LGE Internal Use Only Troubleshooting Guide Measuring input voltage Compressor Wire Connection Noise filter input upper part T S R Noise filter output lower part Inverter PCB assembly Wiring power to inverter PCB on Noise filter Inverter PCB assembly power Noise filter power connection connection Copyright 2011 LG Electronics Inc All right reserved 120 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error No Error Type Error Point Main Reasons 1 Input voltage is abnormal not 15V 15 Offset of micom which senses the Master 751 Fan CT sensor error fan motor phase current is not 2 5V 2 Fan PCB assembly defect Slave1 752 3 Power wire open and connecting fault Slave2 753 4 Inv PCB assembly defect Error Diagnosis and Countermeasure Flow Chart No Is Fan PCB normal gt 1 Replace Fan PCB gt Yes Yes Is there any error when iit reset gt 1 Replace Fan PCB Yes Recheck power and installation condition gt 15V input power wiring conditions Check short of power wire 15V input power on Inverter PCB Copyright 2011 LG Electronics Inc All right reserved 121 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error No Error Type Error Point Main Reasons 76 Master 761 Slave1 762 Slave2 763 Fan
42. all the unit at the specified place e Improper installation may cause the unit to top ple and result in injury When installing and moving the air condition er to another site do not charge it with a different refrigerant from the refrigerant specified on the unit If a different refrigerant or air is mixed with the Original refrigerant the refrigerant cycle may malfunction and the unit may be damaged OO OO R22 R407C Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes Do not install remove or re install the unit by yourself customer e There is risk of fire electric shock explosion or injury Use the correctly rated breaker or fuse There is risk of fire or electric shock Do not install the product on a defective installation stand It may cause injury accident or damage to the product Do not reconstruct to change the settings of the protection devices e If the pressure switch thermal switch or other protection device is shorted and operated forcibly or parts other than those specified by LGE are used fire or explosion may result LGE Internal Use Only Safety Precautions Ventilate before operating air conditioner Securely install the cover of control box and when gas lea
43. amp Bridge Diode wiring each terminal of compressor Copyright 2011 LG Electronics Inc All right reserved 93 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 23 1 DC Link terminal misconnection terminal Master contact fault 231 2 Starting relay damage Slave1 Inverter Compressor DC DC Voltage isn t charged 3 Condenser damage Link Low Voltage after starting relay on 232 9 9 1 4 Inverter PCB assembly damage Slave2 DC Link voltage sensing part 233 5 Input voltage low Error Diagnosis and Countermeasure Flow Chart Are there any power wire connections normal Check Yes 4 R S S T T R phase voltage is 220V 10 Is input voltage normal Check connection condition and wiring if power is abnormal 1 Check R S T wiring conditions Rewire them if abnormality found No 1 Check bridge diode connection condition 2 Check wire disconnection and wiring gt Reassemble if abnormally found Is bridge diode connection normal Yes No Check connection between inverter PCB assembly and Is inverter PCB assembly power l l i bridge diode misconnection disconnection connection normal gt wiring again if abnormality found Yes Is inverter PCB assembly normal Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly if abnormality found Recheck power
44. and Dinstallation condition Copyright 2011 LG Electronics Inc All right reserved 94 iz i LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Inverter PCB amp Bridge Diode wiring Li idishaad ATLL baa HEELAL oa EEE 4 uli ii b a i TA em ED HI WW Pia I HL l S HE I HI r IT VIL All 1 Hill FAN vy HEEN F WA LTL KN ONA AM MH WSD Mih Copyright 2011 LG Electronics Inc All right reserved 95 s LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 24 Master 241 Slave 242 Slave2 243 Excessive rise of discharge pressure in outdoor com pressor Defective high pressure switch Defective fan of indoor unit or outdoor unit Check valve of compressor clogged Pipe distortion due to the pipe damage Refrigerant overcharge Defective LEV at the indoor or outdoor unit Covering or clogging Outdoor covering dur ing the cooling mode Indoor unit filter clog ging during the heating mode SVC valve clogging Defective outdoor PCB Compressor off due to the high pressure switch in outdoor unit E Error diagnosis and countermeasure flow chart Is high pressure switch connector connected No to PCB Note 1 Yes Is high pressure switch connector short during off time No Note 2 Yes
45. and service purposes Function 4 6 Integrated Test Runing Function_Cooling Mode Set 3 This function is checking process for normal operation of parts and system on operating system All processes carry out included refrigerant amount judge logic and check normal condition of parts on cooling mode e This function check only normal condition of parts on heating mode e Saved data can check using LGMV 508 Press the black button for 2 sec 618 All IDU operation on m Cooling mode Temp Condition Error Display Yes 538 Thermo off IDU judge Yes No EE Error Display Refrigerant amount judge ERE during all IDU operation data on Test Runing 15min Press the black button for 2 sec 1 IDU operation Note 1 EE GE 1 IDU operation data 10min mu Press the black button for 2 sec after turning off all of Dip switch Completed DIP Switch Settings T i 1 1 ed FA pa on 2 3 4 23 4 Warning Please reset Main PCB before starting this function Note 1 Judge the normal condition refer to report of Test Running Copyright 2011 LG Electronics Inc All right reserved 38 Only for training and service purposes LGE Internal Use Only Function 4 7 Integrated Test Runing Function_Heating Mode Set 4 The function is checking process for normal operation of parts and system on operationg system All processes carry out included drefrigerant amount judge logic and check normal condition of par
46. art Sensor connection to PCB No 9 Insert sensor connector to PCB properly is normal Yes Is the resistance of No N Replace sensor sensor normal Yes Is sensor resistance No value same as temperature Replace corresponding outdoor PCB value of LGMV Yes Replace corresponding sensor Error is generated if the resistance is more than 5M open and less than 2k short Note Standard values of resistance of sensors at different temperatures 5 variation 10C 362k 25C 200k 50C 82k 100C 18 5k Check the resistance inverter compressor discharge temperature sensor Ag fb JA LE Check the resistance constant speed compressor 2 discharge temperature sensor r a ba B Copyright 2011 LG Electronics Inc All right reserved 107 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons ae 491 Abnormal value of 1 Bad connection of low pressure connector Slavet 422 Sensor eon anion sensor 2 Defect of low pressure connector Open Short ave Slave2 423 acid Open Short 3 Defect of outdoor PCB M hi 431 Abnormal value of 1 Bad connection of high pressure connector one pent enor onde sensor 2 Defect of high pressure connector Open Short Slave1 432 pressure Slave 433 Open Short 3 Defect of outdoor PCB Error diagnosis and countermeasure flow chart Is sensor co
47. articular caution if the output frequency of the inverter is low when using a movable tester where change of measured voltage values is large between other lines when virtually same values appear actually or where there is danger to determine that failure of the inverter occurred 2 You can use rectification voltmeter gt if using commercial frequency tester when measuring output values of the inverter when measuring absolute values Accurate measuring values cannot be obtained with a gen eral movable tester For analog and digital mode Copyright 2011 LG Electronics Inc All right reserved 58 og LGE Internal Use Only Only for training and service purposes 2 2 Fan Motor Checking Item Symptom Checking Method for Key Components Countermeasure 1 The fan motor does not operate Does failure appears again when starting operation 2 Vibration of the fan motor is large Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes 1 When power supply is abnormal 2 For wrong wiring 3 For failure of motor Modify connection status in front of or at the rear of the breaker or if the power terminal console is at frosting condition Modify the power supply voltage is beyond speci fied scope For following wiring 1 Check connection status 2 Check contact of the connector 3 Check that parts are firmly secured by tightening screws 4 Che
48. ave1 Outdoor Unit Constant Compressor1 High Discharge Temperature Speed Compressor1 High Discharge Temperature Q O Q Slave2 Outdoor Unit Constant Speed System is turned off by Slave2 Outdoor Unit Constant 5 Compressor1 High Discharge Temperature Speed Compressor1 High Discharge Temperature 3 5 High Pressure of Master Outdoor Unit System is turned off by excessive increase of high pressure D of Master Outdoor Unit D 9 3 4 High Pressure of Slave1 Outdoor Unit ie o be ke NEGER ODEL High Pressure of Slave2 Outdoor Unit System is turned off by excessive increase of high pressure of Slave2 Outdoor Unit PE Te System is turned off by excessive decrease of low pressure of Master Outdoor Unit 3 5 Low Pressure of Slave1 Outdoor Unit i dt a ha NN PE NE EE System is turned off by excessive decrease of low pressure of Slave2 Outdoor Unit Master Outdoor Unit Low Condensing Master Outdoor Unit stayed under low condensing limit for Ratio Limited 3 minutes 3 Slave1 Outdoor Unit Low Condensing Slave1 Outdoor Unit stayed under low condensing limit for Ratio Limited 3 minutes Slave2 Outdoor Unit Low Condensing Slave2 Outdoor Unit stayed under low condensing limit for Ratio Limited 3 minutes Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes 73 LGE Internal Use Only Self diagnosis function Display Title Cause of Error Master Outdoor Unit Inverter Compressor Master Outdoor Unit Inve
49. case the measured value is different from the table set multi tester to resistance mode and measure If the value is small OQ or high hundreds MQ PCB needs to be replaced 6 In case measured value is different from the table PCB needs to be replaced PCB damaged P1 Terminal Black N Terminal Black U Terminal Red 0 4V 0 7V Open V Terminal Red 0 4V 0 7V Open W Terminal Red 0 4V 0 7V Open P1 Terminal Red N Terminal Red U Terminal Black Open 0 4V 0 7V V Terminal Black Open 0 4V 0 7V W Terminal Black Open 0 4V 0 7V x Red and black are the measuring terminals of multi tester Copyright 2011 LG Electronics Inc All right reserved 64 og LGE Internal Use Only Only for training and service purposes Checking Method for Key Components 2 6 Fan IPM Checking Met Wait until inverter PCB DC voltage gets discharged after the main power switch off Pull out DC Connector and U V W fan motor connector connected with fan PCB Set multi tester in diode mode Measured value should be 0 4 0 7V measuring as below table O A OO N In case the measured value is different from the table set multi tester to resistance mode and measure If the value is small OQ or high hundreds MQ PCB needs to be replaced 6 In case measured value is different from the table PCB needs to be replaced PCB damaged P T
50. ck connection of polarity 5 Check short circuit and grounding Measure winding resistance of the motor coils 2 850 5 25 C 4 For failure of circuit board 59 Replace the circuit board in following procedures if problems occur again when powering on and if there are no matters equivalent to items as specified in above 1 through 4 Carefully check both connector and grounding wires when replacing the circuit board 1 Replace only fan control boards If starting is done it means that the fan control board has defect Replace both fan control board and the main board If starting is done it means that the main board has defect If problems continue to occur even after counter measure of No 1 and No 2 it means that both boards has defect LGE Internal Use Only Checking Method for Key Components 2 4 Yellow Brown Blue Pulse signal output value and valve operation Output state 1 2 on on Output pulse sequence In valve close state 4 gt 3 214 Output No In valve open state 1 2341 1 If EEV open angle does not change all of output phase will be OFF 2 If output phase is different or continuously in the ON state motor will not operate smoothly and start vibrating EEV valve operation At power ON open angle signal of 2000 pulses out put and valve position is set to If valve operates smoothly no noise and vibration
51. ck insulation resistance between ODU fan motor terminal U V W and pipe Are the resistance Between each phase and insulation resistance of motor output terminal normal over 100M Replace fan motor if abnormality found No 1 Check if color of motor output terminal U V W connector matched with PCB s 2 Check wire disconnection and wiring gt Reassemble or replace if abnormality found Is fan motor connection condition normal N gt Check fan PCB assembly IPM normal Replace Fan PCB assembly Is fan PCB assembly normal Yes Recheck power and installation condition Measuring fan motor phase Measuring insulation resistance resistance between fan terminal amp chassis Fan motor wire connection Copyright 2011 LG Electronics Inc All right reserved 124 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 86 Master 861 Main PCB EEPROM 1 No EEPROM Slave1 862 Error Ar EON 2 EEPROM wrong insertion Slave2 863 Error Diagnosis and Countermeasure Flow Chart No Reset after checking EEPROM assemble condition No Is EEPROM assemble condition normal Yes Correct check sum Replace Correct EEPROM Yes Recheck power and installation condition EEPROM insertion EEPROM Main PCB Copyright 2011 LG Electronics Inc All right reserved 125
52. cs Inc All right reserved 69 ge LGE Internal Use Only Only for training and service purposes Checking Method for Key Components 2 15 Others Electrolytic capacitor and resistor for voltage distribution 1 Disconnect an terminal of voltage distribution resistor from each DC link electrolytic capacitor 2 Set the multi meter to resistance mode connect the probe to terminal of the capacitor If the estimated resistance value is increase continuously without short value is 0 then the resistor is normal 3 Set the multi meter to resistance mode confirm that the resistance value of the resistor is around 270 kOhm Check and replace inferior components Copyright 2011 LG Electronics Inc All right reserved 70 og LGE Internal Use Only Only for training and service purposes Self diagnosis function ig 3 Self diagnosis function Self Diagnosis Function Error Indicator e This function indicates types of failure in self diagnosis and occurrence of failure for air condition Error mark is displayed on display window of indoor units and wired remote controller and 7 segment LED of outdoor unit control board as shown in the table If more than two troubles occur simultaneously lower number of error code is first displayed After error occurrence if error is released error LED is also released simultaneously Error Display 1st 2nd LED of 7 segment indicates error number 3rd LED indica
53. cs Inc All right reserved 87 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons Error developed in communication between the micro processor and the EEPROM on the sur error face of the PCB 2 ERROR due to the EEPROM damage Indoor unit EEPROM E Error diagnosis and countermeasure flow chart Replace the indoor unit PCB and then make sure to perform Auto addressing and input the address of central control Copyright 2011 LG Electronics Inc All right reserved 88 Only for training and service purposes LGE Internal Use Only Error Type Error Point Troubleshooting Guide Main Reasons Indoor unit BLDC fan motor Indoor BLDC fan motor 1 Motor connector connection fault failure feedback signal is absent 2 Indoor PCB fault for 50 sec 3 Motor fault Replace indoor unit PCB It is normal when check hall sensor of indoor fan motor as shown below Each termainl with the tester TH chassis TD chassis S 090 gt men u _ amp hundreds ko hundreds ko ddr gt rum hundreds ko hundreds ka Checking connection state of fan motor connector gt Replace the indoor unit PCB and then make sure to do Auto addressing and input the address of central control Notice The connection of motor connector to PCB should be done under no power supplyi
54. d U Terminal Black Open 0 4V 0 7V V Terminal Black Open 0 4V 0 7V W Terminal Black Open 0 4V 0 7V U terminal V terminal W terminal H R Hi a JE ese ae SRE 6 ar gt EN ea gt amp ee eer aan si Bi gt sees a med A em er in Smet b if REENER pa Bal OVO U V W Connector DC Connector N terminal P terminal UX2 Fan PCB 66 Copyright 2011 LG Electronics Inc All right reserved LGE Internal Use Only Only for training and service purposes Checking Method for Key Components Connect manifold gauge to the service valve of outdoor unit and compare the output of high pressure sensor to the output of low pressure sensor to detect the defect below Compare the output of pressure sensor to the output of manifold gauge pressure using the table below Read output signal clearly between black and white wire as the composition of pressure sensor lt Low Pressure Sensor gt lt High Pressure Sensor gt OUTPUT CHARCTERISTICS OUTPUT CHARCTERISTICS 5 0 4 5 _ 4 0 35 gt E 3 0 E 25 5D 20 le 2 1 5 2 gt 1 0 J E 0 0 0 0 1 3 2 5 3 8 5 0 6 3 7 5 Pressure MPa Pressure MPa 1 If the pressure of manifold gauge is 0 1kg cm it indicates the pressure got lower due to the leakage of refriger ant Find the place of leakage and fix it 2 If
55. d away properly based on the installation manual Abad connection may cause water leakage IG RAR Ai EERE eo Q Or gt Cd Be very careful about product transportation e Only one person should not carry the product if it weighs more than 20 kg e Some products use PP bands for packaging Do not use any PP bands for a means of transportation It is dangerous Do not touch the heat exchanger fins Doing so may cut your fin gers e When transporting the outdoor unit suspending it at the specified positions on the unit base Also support the outdoor unit at four points so that it cannot slip sideways Copyright 2011 LG Electronics Inc All right reserved 8 Only for training and service purposes LGE Internal Use Only Safely dispose of the packing materials e Packing materials such as nails and other metal or wooden parts may cause stabs or other injuries Tear apart and throw away plastic packaging bags so that children may not play with them _ If children play with a plastic bag lt which was not torn apart they face the risk of suffocation Do not touch any of the refrigerant piping during and after operation It can cause a burn or frostbite
56. d refrigerant auto charging Chassis UX2 1 Comp UX3 2 Comp No of sensor 6 7 2 Check abnormal sensor 3 It is displayed at the LED on the main PCB at each step 4 Reference the sensor error in next page CAUTION 1 Confirm auto addressing has been performed Check installed number of IDU 2 The error can be displayed even if the sensor is normal according to installation and temperature condition If error occurs check the sensor and judge abnormality Copyright 2011 LG Electronics Inc All right reserved 33 og LGE Internal Use Only Only for training and service purposes Function 4 4 Refrigerant Auto Charging Set 1 This function charges appropriate amount of refrigerant automatically through cycle operation It can be used when refrigerant amount Isn t certain because of SVC and leakage x Refrigerant charging time is depending on charging amount Charging time About 3min Kg Main PCB 4 SWO1S Wait for 3 min after power reset Main PCB EE et the Dip l pe Refer to DIP S W setting SW02B Main PCB Press the black button SWO1V Press until 508 is displayed he Press the black butt IDU runs with cooling mode In designated order Is it necessary to charge refrigerant q Main PCB SWO1V Press the black button EEE DO DIP Switch Settings i 1 1 wad i 2 2 pasa 3 4 3 4 Warning Please reset Main PCB before starting th
57. e Sensor open or short Pressure unbalance between Outdoor Units Pressure unbalance between Outdoor Units Pressure unbalance between Outdoor Units Master Outdoor Unit rated speed 1 condenser burned Locked or fault by over current Slave1 Outdoor Unit rated speed 1 condenser burned Locked or fault by over current Slave2 Outdoor Unit rated speed 1 condenser burned Locked or fault by over current Master Outdoor Unit rated speed 2 condenser burned locked or fault by over current Slave1 Outdoor Unit rated speed 2 condenser burned locked or fault by over current Slave2 Outdoor Unit rated speed 2 condenser burned locked or fault by over current 80 LGE Internal Use Only Self diagnosis function 1 Master outdoor unit Main Board Main Master Outdoor Unit Main Board Main Sub Micom communi Sub Micom communication error cation failed Slave1 outdoor unit Main Board Main Slave1 Outdoor Unit Main Board Main Sub Micom communi Sub Micom communication error cation failed Slave2 outdoor unit Main Board Main Slave2 Outdoor Unit Main Board Main Sub Micom communi Sub Micom communication error cation failed O 1 Excessive increase of Master Outdoor Master Outdoor Unit Fan Inverter PCB Temperature is Over 8 Unit Fan PCB Heat Sink Temperature 95 C c 19132 Excessive increase of Slave1 Outdoor Slave1 Outdoor Unit Fan Inverter PCB Temperature is Over D Unit Fan PCB Heat Sink Temperature 95 C pe 3 3 Excessive i
58. ee whether there is any refrigerant leakage and slack of power or communication cable Confirm that 500 V megger shows 2 0 MQ or more between power supply terminal block and ground Do not operate in the case of 2 0 MQ or less NOTE Never carry out megaohm check over terminal control board Otherwise the control board would be broken Immediately after mounting the unit or after leaving it turned off for an extended length of time the resistance of the insulation between the power supply terminal board and the ground may decrease to approx 2 MQ as a result of refrigerant accumulating in the internal compressor If the insulation resistance is less than 2 MQ turning on the main power supply and energizing the crankcase heater for more than 6 hours will cause the refrigerant to evaporate increasing the insulation resistance Check if high low pressure common pipe liquid pipe and gas pipe valves are fully opened NOTE Be sure to tighten caps Check if there are any problems in automatic addressing Check and confirm that there are no error messages in the display of indoor units or remote controls and LED in outdoor units caution when cutting main power of the Multi V Always apply main power of the outdoor unit during use of product cooling season heating season Always apply power before 4 hours to heat the crank case heater where performing test run after installation of product It may result in burning out of the
59. erminal Black N Terminal Black U Terminal Red 0 4V 0 7V Open V Terminal Red 0 4V 0 7V Open W Terminal Red 0 4V 0 7V Open P Terminal Red N Terminal Red U Terminal Black Open 0 4V 0 7V V Terminal Black Open 0 4V 0 7V W Terminal Black Open 0 4V 0 7V U terminal V terminal W terminal U terminal V terminal W terminal U V W Connector U V W Connector N terminal P terminal N terminal P terminal DC Connector UX3 Fan PCB Copyright 2011 LG Electronics Inc All right reserved 65 ge LGE Internal Use Only Only for training and service purposes Checking Method for Key Components 2 7 Fan IPM Checking Method Wait until inverter PCB DC voltage gets discharged after the main power switch off Pull out DC Connector and U V W fan motor connector connected with fan PCB Set multi tester in diode mode Measured value should be 0 4 0 7V measuring as below table In case the measured value is different from the table set multi tester to resistance mode and measure If the value is small OQ or high hundreds MQ PCB needs to be replaced nr OO N 6 In case measured value is different from the table PCB needs to be replaced PCB damaged P Terminal Black N Terminal Black U Terminal Red 0 4V 0 7V Open V Terminal Red 0 4V 0 7V Open W Terminal Red 0 4V 0 7V Open P Terminal Red N Terminal Re
60. for Key Components aaneen 60 2 1 COMES Ls 60 22 Fah MOTON vvs 61 2 3 Electronic Expansion Valve raxranvnnnennnnnnnnnnnnnnnnnnnnnnnnnennnnnnennnennuenn 62 2 4 Phase Bridge Diode Checking Method 65 2 5 Inverter IPM Checking Method nnnxnnnnnnnnnnnnnnennnnnnnnnnnennnnnnnnnnnnnnnnnnnnnnnnen 66 2 6 Fan IPM Checking Method UX3 chassis aannemen 67 2 7 Fan IPM Checking Method UX2 chassis ennen ennnnn 68 2 8 Pressure Sensor High Low Pressure Sensor nanne 69 29 FN 4 69 210 Solenoid VANG L ven 70 211 MEVErSe VANG mene 71 2 12 Temperature Sensor rrrrvnnnnnnnnnnvnnnnnnnnnnnnnnnnnenennnnnnnnnnnnnnenennnnnnnnnnnnnnnnenn 71 20 MN 72 3 Self diagnosis TUN 0 serine 73 Copyright 2011 LG Electronics Inc All right reserved 56 og LGE Internal Use Only Only for training and service purposes The phenomena from main component failure a 1 The phenomena from main component failure The phenomena from main component failure Component Phenomenon Check method and Trouble shooting Not operating Motor insulation broken Check resistance between terminals and chassis Strainer clogged Change strainer Compressor Oil leakage Check oil amount after opening oil port Stop during running Motor insulation failure Check resistance between terminals and chassis Abnormal noise R S T misconnection Check compressor R S T connection during running High pressure error Motor failure Check the fan
61. g power Heating failure frozen outdoor heat exchanger part Low pressure error or discharge temper ature error Check connector Coil failure Check resistance between terminals EEV clogged Service necessary Bad connector contact EEV clogged Service necessary When system fault occurs the error code is displayed at indoor unit display or remote control display the trou ble shooting guide is in the service manual e When CH05 53 11 ERROR occurs check if auto addressing has done and communication wiring is ok For detailed information please refer Multi V Troubleshooting Guide Book Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes 51 LGE Internal Use Only Test Run 3 DIP Switch Setting l E Location of setting Switch Heat Pump Main PCB 7 Segment SWO2V Auto Addressing Copyright 2011 LG Electronics Inc All right reserved 52 Only for training and service purposes LGE Internal Use Only Test Run DIP switch setting i E Checking according to dip switch setting You can check the setting values of the master outdoor unit from the 7 segment LED Power reset is required every time the DIP switch setting is changed B Checking the setting of the Master unit The number is sequentially appeared at the 7 segment in 5 seconds after applying the power This number represents the set ting condition For example represents R410A 30HP
62. h low pressure target doesn t get satisfied for some time after the starting operation 1 Guaranteed temperature range Error will occur if temperature is out of range IDU 20 32 C ODU 0 43 C this temperature range is specifically for accurate refrigerant charging 2 For refrigerant charging use designated device only Capillary Assembly Set 3 Set the IDU wired remote controller temperature sensing mode as IDU 4 Be careful that IDU should not be thermo off Copyright 2011 LG Electronics Inc All right reserved 35 Only for training and service purposes LGE Internal Use Only Function 4 5 Refrigerant Checking Function Set 2 This function judges refrigerant leakage and overcharging It can be used with refrigerant auto charging function Inspection Start Press black button for 2 seconds YES Display Error EEE N Proper Temperature 2 l i NO EEE Thermo off indoor unit YES Mi a a T T Display Error Press black button for 2 seconds Refrigerant Gas Liquid Too much Notenough Cannot tell 9 Refi Refr Quantity pipe direct age EE RE Normal connection Can Press black button for 2 seconds Data Reset and Wait Warning Please reset Main PCB before starting this function Note 1 In case air temperature is out of guaranteed temperature refrigerant checking function may end without performing refrigerant checking Use guaranteed temperature range only 2 During the p
63. here are sharp and moving parts that could cause personal injury Q ge kaf X LGE Internal Use Only Information 1 Mod l Names Le 11 1 1 Indoor Unit Guan 11 12 Or UMIT aaneen ennn nd 11 2 External Appearance sssssvvnvrnnnnrvennnnnnnnnnnnnnnnnnnnvvnnennverr 13 2 1 Indoor UN Lua 13 22 Outdoor Una 14 3 Combination of Outdoor Units nnen 15 4 NOMENGIALUFE aren snah 16 4 1 Indoor Un 16 22 Outdoor UN 4 16 Copyright 2011 LG Electronics Inc All right reserved 10 Only for training and service purposes LGE Internal Use Only 1 1 Indoor Unit i 1 Model Names Model Names Capacity Btu h kW Category ARNUO ARNUO9 ARNU12 Wall Mounted dE 2 General ARNUO07 ARNUO9 ARNU12 ART Mirror 3SE 2 COOL sg ARNU18 3582 ARNUO07 ARNUO9 ARNU12 ARNU18 Anay 312 312 ARNU05 ARNUO7 3TR 2 3TR2 Ceiling ARNU15 pied Cassette 4 Way ARNUO093 ARNU123 TN 2 ARNU48 3TM 2 ARNU07 ARNUO9 ARNU12 ARNU15 ARNU18 3BHA2 3BHA2 3BHA2 3BHA2 3BHA2 BG ARNU15 ARNU18 ARNU24 ARNU28 ARNU36 ARNU42 High Stat 3BGA2 3BGA2 3BGA2 3BGA2 3BGA2 3BGA2 ere ARNU483 BRA2 Ceiling B8 al oti m ARNUO7 ARNUO9 ARNU12 DV 3B1G2 3
64. i G http biz lgservice com MUL Vm Outdoor Unit MODEL ARUN Series CAUTION Before Servicing the unit read the safety precautions in General SVC manual Only for authorized service personnel MULTI V m Air Conditioner Service Manual TABLE OF CONTENTS Safety Peas 44244444 3 Part 1 General Information wsscatesvecescctacescansiessexawescdddencusachivsesceccnucscceteemesvedaeeneweastesees 10 Model Names uurrrnnnnnnnrrvnnnnnnnnvnnrrvnnnnnenevevevrrvvnnnnenssveenrrvvnnnnrevenenrvvnunnenssenenrrvvnunnenssveeevrvvuuuununee 11 External Appearance Ne arssde 13 Combination of Outdoor Units wrrrrrrrrrrrrrvrvvrvvvrvvvvvvvrvrvrrvvrrrvvvevevevrvevevvevverrrevevevererererereveeeee 15 ND 11 0 pean E eee eee 16 Part 2 Outdoor Units oo ccc cccceeeeeeeeeeaaaeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeneneeeenenees 17 Part 3 PCB Setting and Test Run unne annennenneeenennernennenrrenneenn 51 Part 4 Trouble shooting guide nnn aannnnnen enn ennnenee ennen ennnneen 57 Copyright 2011 LG Electronics Inc All right reserved a in Only for training and service purposes LGE Internal Use Only Safety Precautions il Safety Precautions To prevent injury to the user or other people and property damage the following instructions must be followed B Incorrect operation due to ignoring instruction will cause harm or damage The seriousness is Classified by the following indications Be sure not to do Be sure to follow the i
65. icom input voltage isn t 1 Input voltage abnormal R S T within 2 5V 0 3V at initial 2 ODU inverter PCB damage 402 state of power supply CT sensing part Inverter compressor CT sensor error Slave 403 Error Diagnosis and Countermeasure Flow Chart 1 Check R S T wiring conditions 2 Check Noise filter wiring conditions gt Rewire them if abnormality found Are there any power wire connections normal Check R S S T T R phase voltage is 220V 10 Is input voltage normal gt Check connection condition and wiring if power is abnormal Is inverter PCB assembly normal Replace inverter PCB assembly Yes Recheck power and installation condition Measuring input voltage LGMV Part Fela Curie Gk Cares fill S re Feiler Copyright 2011 LG Electronics Inc All right reserved 106 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error No Error Type Error Point Main Reasons 41 Inverter Slave1 472 1 Defective connection of the Master 411 Slave2 473 compressor discharge pipe tem Ms perature sensor charge pipe tem Sensor measurement valve is abnormal 2 Defective discharge pipe com 47 Master 481 ie Sele Open Short pressor sensor of the compres Constant 1 Slave1 482 sor open short Master 471 Slave2 483 3 Defective outdoor PCB Slave1 412 48 Slave2 413 Constant 2 Error diagnosis and countermeasure flow ch
66. ied immediately The changed setting will be enabled only when Power is reset or by pressing Reset button DIP Switch Settings Heat pump pai bal In Setting1 il PEEL i LARA Refrigerant Auto Recharge i 2 3 4 5 6 7 1 2 3 4 5 6 7 123 4 5 6 7 8 9 10 11 12 13 14 a aR Setting2 pa pa p ll i MT LLL i LA FLAA i Refrigerant Quantity Auto Ly aloes nore 1 2 34 5 6 7 Decide 12 3 4 5 6 7 8 9 10 11 12 13 14 ON me ON 2 Setting3 ii UA ART LAP EA JF Integrated Test Run 1 2 er e ei cooling 123 4 5 6 7 8 9 10 11 12 13 14 2 n Setting4 ae pa tl pa I LLULL UULU li Integrated Test Run 1 2 3 4 5 6 7 12030425 6 7 1234567 8 9 1011 12 13 14 heating Warning Please reset Main PCB before starting this function Copyright 2011 LG Electronics Inc All right reserved 32 Only for training and service purposes LGE Internal Use Only Function Wait for 3 min No after power reset Yes Setting Dip s w Note 3 No sve Ld Press the black button for 2 sec I I Judging sensor normality Press the black button for 5 sec Yes No a ENE Error Display Press the black button for 2 sec Integrated Test Runing C Cooling D Heating Start checking each function Refrigerant Auto Checking Charging Function Press the black button for 2 sec after turning off all of SIP switch Completed Note 1 Sensor checking function is used with refrigerant checking an
67. ight 2011 LG Electronics Inc All right reserved Only for training and service purposes 15 LGE Internal Use Only Nomenclature A 4 Nomenclature 4 1 Indoor Unit ARN 2 Generation Combinations of functions A Basic function L Neo Plasma Wall Mounted C Plasma Ceiling Cassette G Low Static U Floor Standing without Case ART COOL Type Panel Color B Blue R Mirror V Silver Chassis Name Electrical Ratings 1 10 115V 60Hz 2 10 220V 60Hz 6 10 220 240V 50Hz 7 19 100V 50 60Hz 3 10 208 230V 60Hz Total Cooling Capacity in Btu h Class EX 18 000 Btu h Class gt 18 Combination of Inverter Type and Cooling Only or Heat Pump N AC Inverter and H P V AC Inverter and C O U DC Inverter and H P and C O MULTIV System with Indoor Unit using R410A sk LGETA U Ex URN x Heat recovery ventilator refer to the DX Coil manual 4 2 Outdoor Unit gy Aru Seg Serial Number Air Discharge Type T Top Discharge Electrical Ratings B 3 208 230V 60Hz Total Cooling Capacity in Btu h EX 72 000 Btu h Class gt 072 Combination of Inverter Type and Cooling Only or Heat Pump N Inverter and H P V Cooling Only MULTIV System with Outdoor Unit using R410A Copyright 2011 LG Electronics Inc All right reserved 16 og LGE Internal Use Only Only for training and service purposes r Units Copyright 2011 LG Electronics Inc All right reserved 17
68. ing table during defrost operation Outdoor Unit Inv Compressor Setting Value Constant Speed Compressor ON High pressure control Normal control Main EEV Normal control Max pulse Normal control Subcooling EEV Normal control Min pulse Normal control 4way valve On OFF OFF ON Hot gas bypass valve Normal control Normal control Normal control Indoor Unit Component Starting Running Ending Fan OFF OFF OFF Thermo on unit EEV Normal control 400 800 pulse Normal control E Ending condition 1 All heat exchanger pipe temperature are above setting temperature for 30 sec 2 The running time of defrost operation is over 30 of the total heating time 3 If compressor protection control starts by high discharge temperature of compressor etc Copyright 2011 LG Electronics Inc All right reserved 24 iz LGE Internal Use Only Only for training and service purposes Function 2 3 Stopping operation 2 3 1 Stopping operation on cooling mode Component Operation Inv Compressor OFF Constant Speed Compressor FAN Stop Main EEV 50 pulse Stop Min pulse Subcooling EEV 35 pulse Stop Min pulse 4way valve OFF Hot gas bypass valve OFF OFF after 15 min 2 3 2 Stopping operation on heating mode Component Operation Inv Compressor OFF Constant Speed Compressor FAN Stop Main EEV 50 pulse Subcooling EEV 35 pulse Stop Min pulse 4way valve ON OFF
69. ipe over 50M gt Replace compressor if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Check inverter PCB assembly IPM normality Replace inverter PCB assembly if abnormality found LGE Internal Use Only Troubleshooting Guide Measuring resistance between Compressor wire connector connection each terminal of compressor point IPM joining point 0 URTEA oe od Morbo d r Check joining condition Copyright 02011 LG Electronics Inc All right reserved 91 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons Overload operation Pipe clogging Covering EEV defect Ref Master overcharge 22 221 ee rd Compressor damage Insulation Slave AC Input Current Over Error Input 3 phase power damage Motor damage current is over limited 222 value 40A Input voltage low Slave2 Power Line Misconnection 223 Inverter PCB Assembly damage Input current sensing part E Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or
70. is function Note 1 After installing the refrigerant charging device Raffa as shown in figure open the valve 2 In case air temperature is out of guaranteed temperature it may end without performing Auto charging 3 Refrigerant charging Time may change according to the charging amount Abt 1 5min Ib Copyright 2011 LG Electronics Inc All right reserved 34 og LGE Internal Use Only Only for training and service purposes Function N C ME GEER gt A e N 5 DR I fa KO AZ NE A N N Capillary Assembly Procedure 1 Arrange manifold capillary assembly refrigerant vessel and scale 2 Connect manifold to the gas pipe service valve of ODU as shown in the figure 3 Connect manifold and Capillary tube Use designated capillary assembly only If designated capillary assembly isn t used the system may get damaged 4 Connect capillary and refrigerant vessel 5 Purge hose and manifold 6 After Is displayed open the valve and charge the refrigerant E Error contents about auto refrigerant charging function Temperature Range Error In case that IDU or ODU is out of range Low Pressure Descent Error In case the system runs at low pressure limit for over 10 minutes Judging rapid refrigerant inflow In case the liquid refrigerant flows in because of not using designat ed Capillary Assembly Instability Error In case the hig
71. ition of heat sink and temperature sensor Is temperature sensor attached to heat sink Check connection condition Yes Check heat sink temperature No sensor wire disconnection Checking temperature sensor disconnection gt Measure temperature sensor Is terrnperature sensor normal resistance 10kQ 5 at 25 C gt Replace the sensor if Yes abnormality found No Is fan PCB assembly normal Replace fan PCB assembly Yes Recheck power and installation condition Copyright 2011 LG Electronics Inc All right reserved 136 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error Type Main Reasons 1 RS 485 communication wiring defect 2 Communication defect between Network error of central con remote controller and indoor unit troller 3 RS 485 dip switch setting error 4 Indoor unit addressing ssetting error on central controller Network Error E Error diagnosis and countermeasure flow chart No 1 Reconnect RS 485 communication wire Yes Are there any communication wire of RS 485 connections normal Yes Are there any overlap of IDU address Reset the overlap of IDU address for single address No 1 Set the slave mode with Simple central controller after reset No Is Simple central controller setting normal Yes Recheck power and installation condition lt RS 485 com
72. k R S T wiring conditions gt Rewire them if abnormality found Is inverter PCB assembly power Check connection between inverter PCB assembly and connection normal bridge diode misconnection disconnection gt wiring again if abnormality found Yes v INV PCB LED display error Replace inverter PCB assembly Recheck power and installation condition Copyright 2011 LG Electronics Inc All right reserved 97 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 26 1 Overload operation Master Pipe clogging Covering EEV defect Ref ad Inverter compr r starting Starting fail b f veg Slave1 erter compressor starting Starting failure because o 2 Compressor damage 262 failure Error compressor abnormality Insulation damage Motor damage Slave 3 Compressor wiring fault 263 4 ODU inverter PCB damage CT Error Diagnosis and Countermeasure Flow Chart 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure Reassemble or manage if abnormality found Is installation condition normal Are there any power wire 1 Check R S T wiring conditions connections normal Rewire them if abnormality found 1 Check resistance between each terminal of compressor U V 0 179047 V W 0 1780 7 W U 0 1780
73. ked out the panel e It may cause explosion fire and burn f the cover and panel are not installed securely dust or water may enter the outdoor unit and fire or electric shock may result If the air conditioner is installed in a small room measures must be taken to prevent the refrigerant concentration from exceeding the safety limit when the refrigerant leaks e Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceed ed Should the refrigerant leak and cause the safety limit to be exceeded harzards due to lack of oxy gen in the room could result E Operation Do not damage or use an unspecified power Use a dedicated outlet for this appliance cord e There is risk of fire electric shock explosion or There is risk of fire or electrical shock injury VERS Be cautious that water could not enter the Do not touch the power switch with wet product hands e There is risk of fire electric shock or product e There is risk of fire electric shock explosion or damage injury Copyright 2011 LG Electronics Inc All right reserved D iz LGE Internal Use Only Only for training and service purposes Safety Precautions When the product is soaked flooded or submerged contac
74. l 2 Check EEPROM Check SUM Replace if abnormality found Replace inverter PCB assembly Is inverter PCB assembly normal Recheck power and Linstallation condition Inverter EEPROM inserting point gt Note Replace after power off Copyright 2011 LG Electronics Inc All right reserved 116 LGE internal Use Onl Only for training and service purposes y Troubleshooting Guide Error No Error Type Error Point Main Reasons 1 Fan motor defect assembly condition abnormal Fan RPM is 10RPM or less 2 Wrong connection of fan motor connector for 5 sec when ODU fan Hall sensor U V W output starts or 40 RPM or less after fan starting 3 Reversing rotation after RPM target apply 67 Master 671 Fan Lock Error Slave1 672 Slave2 673 4 Fan PCB assembly defect 5 Fan lock by Heavy Snowfall Error Diagnosis and Countermeasure Flow Chart Check ODU Fan Motor assemble condition and fan locking gt Reassemble or replace if abnormality found Is ODU Fan Motor Assemble condition normal 1 Check resistance between each phase U V W of ODU fan motor terminal 2 850 5 25 C No 2 Check insulation resistance between ODU fan motor terminal U V W gt Replace fan motor if abnormality found Is ODU Fan Motor normal Yes Check wiring between OUD fan motor and fan PCB No Check if Hall Senor and Motor output terminal color is matched Reassemble if abno
75. l return process ends if compressor protection control starts Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes 22 Normal control 400 pulse Normal control 40 pulse LGE Internal Use Only 2 1 2 Oil return control on heating mode Outdoor Unit Component Starting Running Function Inv Compressor Constant Speed Compressor 50Hz OFF Setting Value ON OFF FAN Normal control Normal control Normal control Main EEV Subcooling EEV 4way valve Max pulse Normal control ON Max pulse Min pulse OFF Max pulse 100 pulse ON Hot gas bypass valve Indoor Unit Fan Thermo on unit EEV Normal control Starting Normal control Normal control Normal control Running OFF 400 800 pulse Normal control Ending Normal control Normal control Thermo off unit EEV 80 130 pulse M Oil return operation time 3 min for running step E Starting condition same as cooling mode M Oil return process ends if compressor protection control starts Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes 93 400 800 pulse 80 130 pulse LGE Internal Use Only Function 2 2 Defrost Defrost operation eliminates ice accumulated on heat exchanger recovering performance of heat exchanger Each cycle component operates as follow
76. mperature Sensor open or short Sensor Fault Copyright 2011 LG Electronics Inc All right reserved 74 iz i LGE Internal Use Only Only for training and service purposes Self diagnosis function Display Title Cause of Error Master Outdoor Unit Heat Exchanger Master Outdoor Unit Heat Exchanger Temperature Temperature Sensor Front side Fault Sensor Front side open or short Slave1 Outdoor Unit Heat Exchanger Slave1 Outdoor Unit Heat Exchanger Temperature Sensor Temperature Sensor Front side Fault Front side open or short Slave2 Outdoor Unit Heat Exchanger Slave2 Outdoor Unit Heat Exchanger Temperature Temperature Sensor Front side Fault Sensor Front side open or short Master Outdoor Unit Suction Temperature Master Outdoor Unit Suction Temperature Sensor open or Sensor Fault short Slave1 Outdoor Unit Suction Temperature Slave1 Outdoor Unit Suction Temperature Sensor open or Sensor Fault short Slave2 Outdoor Unit Suction Temperature Slave2 Outdoor Unit Suction Temperature Sensor open or Sensor Fault short Master Outdoor Unit Constant Speed Compressor1 Discharge Temperature Sensor Fault Master Outdoor Unit Constant Speed Compressor Discharge Temperature Sensor open or short Slave1 Outdoor Unit Constant Speed Compressor1 Discharge Temperature Sensor Fault Slave1 Outdoor Unit Constant Speed Compressor Discharge Temperature Sensor open or short Slave2 Outdoor Unit Constant Speed
77. mpressor stops and same error appears again 2 If output voltage of the inverter is stably output 1 Power on for 12 hours or more Go to No 2 Go to No 2 after applying power for designated time 12 hours Check IPM may fail Check coil resistor and insula tion resistor If normal restart the unit If same symptom occurs replace the compressor Insulation resistor 2MW or more Coil resistor Inverter Constant Speed 0 179 Q 25 C 0 78 Q 7 25 C 0 178 Q 25 C 0 78 Q 7 25 C 0 178 Q 25 C 0 79 Q 7 25 C 3 If output voltage of the inverter is unstable or it is OV When incapable of using a digi tal tester Check the IPM If the IPM is normal replace the inverter board Check coil resistor and insula Figure 2 tion resistor Cautions when measuring voltage and current of inverter power circuit Measuring values may differ depending on measuring tools and measuring circuits since voltage current in the power supply or output side of the inverter has no since waveform Especially output voltage changes when output voltage of the inverter has a pattern of pulse wave In addition measuring values appear largely differently depending on measuring tools 1 If using a movable tester when checking that output voltage of the inverter is constant when comparing rela tive voltage between lines always use an analog tester Especially exercise p
78. munication cable of indoor Yes unit displayed error END No Check the main power supply at the ODU terminal block Is outdoor PCB LED blinking N Replace outdoor PCB after a checking Replace TRANS after checking Yes Yes Check the insulation of inverter Is main circuit breaker off constant compressor and replace if required Check the capacity of main circuit breaker and replace if required Improper connection of power supply cable If all ok Turn on main circuit breaker Main power supply problem Re connect communication cable Outdoor PCB fault Replace after checking Yes Check if the communication cable is properly connected to indoor outdoor terminal block Indoor PCB fault Replace after checking Note1 communication from IDU is normal if voltage If the DC voltage between communication terminal A B fluctuation 9V 9V exists when checking DC voltage of indoor unit is fluctuate within 9V 9V then of communication terminal between IDU and ODU communication from outdoor unit is normal 7 O Copyright 2011 LG Electronics Inc All right reserved 86 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons Indoor unit outlet pipe _ Indoor unit outlet pipe Refer to CHO2 temperature sensor temperature sensor open error or short Copyright 2011 LG Electroni
79. munication wire miss connection gt Copyright 2011 LG Electronics Inc All right reserved 137 Only for training and service purposes LGE Internal Use Only P NO MFL54555525 AGUEST 2011
80. n PCB Slave Unit Dip SW No gt Connect power cable Slave1 122 13040506 7 8 9 10 11 12 13 14 ON ON LUT LEG EL 2 S l a A VES Aa be 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Copyright 2011 LG Electronics Inc All right reserved 127 Only for training and service purposes Connect communication cable Troubleshooting Guide Main Reasons 1 Loose connection of power cable communi cation cable Open Short 2 Defect of each outdoor unit PCB LGE Internal Use Only Troubleshooting Guide Error Type Error Point Main Reasons 105 hl En 1 Wrong connection between Inverter and 11 gt 051 Communication error ae si Fan controller didn t receive signal Fan PCB avo T from inverter controller 2 Fan PCB power not supplied 12 gt 052 PCB l Slave2 3 ODU Inv Fan PCB defect 13 gt 053 Error Diagnosis and Countermeasure Flow Chart Is fan PCB communication No LED yellow blinking normally 1 Check DC 15V power cable between Inverter PCB and fan PCB 2 Check communication cable between Inverter PCB and fan PCB gt Reconnect or replace wire if abnormality found Yes Is inverter PCB No communication LED yellow blinking normally Check communication cable between Inverter PCB and fan PCB gt Reconnect or replace wire if abnormality found Yes No Is fan PCB assembly normal Recheck power and installation condition Fan PCB assembly Repl
81. ncrease of Slave2 Outdoor Slave2 Outdoor Unit Fan Inverter PCB Temperature is Over 2 Unit Fan PCB Heat Sink Temperature 95 C O 1 Master Outdoor Unit Fan PCB Heat Sink Master Outdoor Unit Fan PCB Heat Sink Temperature Temperature Sensor Error Sensor open or short 1 91419 Slave1 Outdoor Unit Fan PCB Heat Sink Slave1 Outdoor Unit Fan PCB Heat Sink Temperature Temperature Sensor Error Sensor open or short 3 Slave Outdoor Unit Fan PCB Heat Sink Slave2 Outdoor Unit Fan PCB Heat Sink Temperature Temperature Sensor Error Sensor open or short Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes 81 LGE Internal Use Only Troubleshooting Guide Error Type Error Point Main Reasons Indoor unit air sensor error 1 Indoor unit PCB wrong connection Indoor unit pipe inlet sensor error Indoor a rial IS 2 Indoor unit PCB failure rae open shor Indoor unit pipe outlet sensor error j 3 Sensor problem main reason Change the sensor Change the PCB In case the value is more than 100kQ open or less than 100Q short Error occurs Refer Resistance value maybe change according to temperature of temp sensor It shows according to criteria of current temperature 5 margin gt Normal Air temp sensor 10 C 20 7kQ 25 C 10kQ 50 C 3 4kO Pipe temp sensor 10 C 10kQ 25 C 5kQ 50 C 1 8kO an CN ROOM Indoor air temp sensor ge he CN PIPE2
82. nd 1 Check resistance between each motor output terminal Are the resistance 2 850 5 25 C Between each phase and insulation 2 Check insulation resistance between ODU fan motor terminal U V W and pipe resistance of motor output terminal normal over 100M Replace fan motor if abnormality found 1 Check if color of motor output terminal U V W connector matched with PCB s 2 Check wire disconnection and wiring Reassemble or replace if abnormality found Is motor wire connection condition normal Is Fan PCB assembly normal 1 Check fan PCB assembly IPM normal Replace Fan PCB assembly Recheck power and installation condition Measuring fan motor phase resistance Fan motor wire connection Copyright 2011 LG Electronics Inc All right reserved 123 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 1 Fan motor defect assemble condition abnor mal Fan Motor initial starting failure 2 Fan motor connector misconnection Hall sen sor U V W ouput 3 Fan PCB defect Master 791 Fan Starting Failure Slave1 792 Error Slave2 793 E Error Diagnosis and Countermeasure Flow Chart Is fan motor assemble Check ODU fan motor assemble condition and locking condition normal Reassemble or replace if abnormality found 1 Check resistance between each motor output terminal No 2 850 5 25 C 2 Che
83. ng Please reset Main PCB before starting this function Copyright 2011 LG Electronics Inc All right reserved 47 og LGE Internal Use Only Only for training and service purposes Function 4 15 Black Box Function This function saves data immediately before the error occurs in ODU main PCB and thus making error analysis cause possible Data Loading Method IDU ODU stop Press the black button 5 sec EEPROM Main Micom data Loading Yellow LED LEDO1C stops when data is loading After completion it is starts blinking about 20 sec EEPROM data save to PC by using lt Save EEP data gt in LGMV B Saving process Making Data Save EEP data data saving place select file save I Making Data Help start N Ctrl Ny ml x pe LGT 1 For Mun Y by HS Ur gren SKUM ge como AS gbc ight Comes Evan PEEM ug UTE oF lg ONE alta NEI Papa eR nd Stop saveing Option save EEP data OLENE gC Comet Out LEWS gt aise wc coms comp scu SME oe egy ln TTC ig Lig ITEC LTC u Warme gens AE Holgate paean nye Copyright 2011 LG Electronics Inc All right reserved 48 og LGE Internal Use Only Only for training and service purposes tting and Test Run Copyright 2011 LG Electronics Inc All right reserved 49 Only for training and service purposes LGE Internal Use Only Test Run i Test Run 1 Checks Before Test Run Check to s
84. ng and service purposes LGE Internal Use Only Function B Example Slave2 ODU Inv Comp failure Heating mode Heating mode Heating mode Slave2 Slave1 Master gas liquid gas liquid gas liquid pipe pipe pipe pipe pipe pipe 1 Close liquid pipe and common pipe of the unit for pump out operation 2 Operate pump out 3 Close gas pipe of unit after completion 4 End pump out 5 Close common pipe of no 1 2 6 Eliminate refrigerant in common pipe after opening the common pipe of corresponding ODU Replace compressor and perform vacuum 7 Add the refrigerant with auto charging function Copyright 2011 LG Electronics Inc All right reserved 43 Only for training and service purposes LGE Internal Use Only Function 4 10 Auto Back Up Function_Inverter compressor This function allows the system to operate in case of inverter compressor failure by backing up compressor automatically SVC can be asked by displaying error to the customer every 6 hours NO 21 22 26 27 error occur IDU remote controller error clear IDU operation possible inert Yes Example Slave1 Unit INV Comp start failure error occur ODU unit Error number A Caution 1 Request SVC immediately if error occurs 2 Auto back up is set up to 1 inverter Comp 3 If Inverter Comp Auto Back up starts error displays for 10 min every 6 hours 4 Error displays continuously at the corresponding ODU Copyright 2011
85. ng to PCB Copyright 2011 LG Electronics Inc All right reserved 89 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error Type Error Point Main Reasons 21 Master 211 Inverter PCB Assy IPM Slave1 Fault occur 212 Slave2 213 1 Over current detection at Inverter compres sor U V W 2 Compressor damaged insulation dam aged Motor damaged IPM self protection circuit 3 IPM overheating activation Heat sink fan damaged Heat sink fan con Overcurrent IPM overheat nector disconnected Heat sink disassem ing Vcc low voltage bled 4 Inverter compressor terminal disconnected or loose 5 Inverter PCB assembly damaged 6 ODU input current low B Error diagnosis and countermeasure flow chart Yes 4 Are the resistance compressor normal Is compressor Wire connection condition normal normal Copyright 2011 LG Electronics Inc All right reserved 90 Only for training and service purposes Are there any power wire connections normal Between each phase and insulation resistance of Inverter Is inverter PCB assembly Recheck power and installation condition 1 Check R S T wiring conditions gt Rewire them if abnormality found 1 Check resistance between each terminal of compressor U V 0 1790 7 V W 0 1780 7 W U 0 1780 7 25 C 2 Check insulation resistance between compressor terminal and p
86. nits connected should be turned on before Auto Addressing PCRBETOASM SH Shar aloes PT GE 7TATOsee DTT GET TAOS B87TATOSBITT on CN REMO Remote controller connection x The PCB can differ from model to model Check from the right source Checking communication cable connection status Copyright 2011 LG Electronics Inc All right reserved 83 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons Drain pump error Float switch is open due to rising of condensate water level because of drain pump fault or drain pipe clogging 1 Drain pump float switch fault 2 Improper drain pipe location clog ging of drain pipe 3 Indoor unit PCB fault E Error diagnosis and countermeasure flow chart Is the drain pan filled half with condensate water half level of float switch No Yes Is drain pump working _ No Sound drain noise contact etc Yes No Drain pump blocked by foreign particles Is Float switch short On measuring its resistance Yes Replace Indoor PCB or reconnect the connector In indoor unit PCB Does the terminal voltage for drain pump has 220V output No No Yes Replace Drain Pump Check the drain head height and slope Replace indoor unit PCB Replace float switch Yes Checking float switch Low po
87. nnected Connect sensor to PCB correctl Yes Replace corresponding pressure sensor After replacement of outdoor unit main PCB is the system normal Low pressure sensor High pressure sensor Pressure sensor connector Pressure sensor connector o e fe 2 O 0 0 ie 0 0 O 0 0 Ooo T J 50000 Lol o EON se z Ooo 3560 SPS P KERSEN Eh ard eel te amie bees me gt EE ide et EN EE TE 2E ah oe Oe Copyright 2011 LG Electronics Inc All right reserved 108 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error No Error Type Error Point Main Reasons Sensor error of Bad connection of air temperature connector Master 441 l _ Abnormal value of Slavei 442 outdoor air temper sensor Open Short 2 Defect of air temperature connector Open Short Slave2 443 lature Defect of outdoor PCB Piping temperature l Ma 451 er error of heat Abnormal value of Bad connection of air temperature connector ae A52 SE out Sensor Defect of air temperature connector Open Short Slave2 453 door unit heat Open Short Defect of outdoor PCB exchanger A B y eee Compressor suc Ar normal value of Bad connection of air temperature connector aster tion temperatur Slave1 462 ion tempe e sensor Open Short 2 Defect of air temperature connector Open Short Slave2 463 Sensor error Defect of
88. nstruction AWARNING B Installation Have all electric work done by a licensed Ask the dealer or an authorized technician to electrician according to Electric Facility install the air conditioner Engineering Standard and Interior Wire Regulations and the instructions given in this manual and always use a special circuit If the power source capacity is inadequate or e Improper installation by the user may result in electric work is performed improperly electric water leakage electric shock or fire shock or fire may result Always ground the product Always intstall a dedicated circuit and breaker e There is risk of fire or electric shock e Improper wiring or installation may cause fire or electric shock Copyright 2011 LG Electronics Inc All right reserved 3 iz LGE Internal Use Only Only for training and service purposes Safety Precautions For re installation of the installed product always contact a dealer or an Authorized Service Center e There is risk of fire electric shock explosion or injury Do not store or use flammable gas or combustibles near the air conditioner e There is risk of fire or failure of product Prepare for strong wind or earthquake and inst
89. nt Fault Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes 72 LGE Internal Use Only Self diagnosis function Display Title Cause of Error Master Outdoor Unit Constant Speed System is turned off by Master Outdoor Uunit Constant Compressor2 High Discharge Temperature Soeed Compressor2 High Discharge Temperature 310 Slave1 Outdoor Unit Constant Speed System is turned off by Slave1 Outdoor Unit Constant Compressor2 High Discharge Temperature Speed Compressor2 High Discharge Temperature Slave2 Outdoor Unit Constant Speed System is turned off by Slave2 Outdoor Unit Constant Compressor2 High Discharge Temperature Soeed Compressor2 High Discharge Temperature Master Outdoor Unit Inverter Compressor System is turned off by Master Outdoor Unit Inverter High Discharge Temperature Compressor High Discharge Temperature 3 lo Slave1 Outdoor Unit Inverter Compressor System is turned off by Slave1 Outdoor Unit Inverter High Discharge Temperature Compressor High Discharge Temperature Slave2 Outdoor Unit Inverter Compressor System is turned off by Slave2 Outdoor Unit Inverter Discharge High Temperature Compressor High Discharge Temperature Master Outdoor Unit Constant Speed System is turned off by Master Outdoor Uunit Constant Compressor1 High Discharge Temperature Speed Compressor1 High Discharge Temperature o 313 Slave1 Outdoor Unit Constant Speed System is turned off by Sl
90. oe Hl Er Copyright 2011 LG Electronics Inc All right reserved 41 Only for training and service purposes LGE Internal Use Only Function 4 9 Pump Out This function gathers the refrigerant to other ODU and IDU Use this function in case of compressor failure ODU parts defect leakage Close liquid SVC V V of each unit Open gas SVC V V of each unit ODU SVC V V Setting Close high low pressure common pipe of corresponding ODU Power reset after Dip switch setting of ODU Refer to Dip switch setting page General case Inv Comp failure case Liquid Pipe Gas Pipe ODU SVC V V Setting IDU ODU OFF Cri A Power reset after Dip switch off Note If ERG is displayed close gas SVC V V of all ODU immediately If low pressure descends below 229 kPa the system turns off automatically Close gas SVC V V immediately This function is operating only Heat Pump model Liquid Pipe Gas Pipe A Caution 1 Use pump out function within guaranteed temperature range IDU 10 30 C ODU 5 40 C 2 Make certain that IDU doesn t run with thermo off mode during operation 3 Pump out function takes 2 5 min after compressor start Make certain that IDU doesn t run with thermo off mode during operation in case low pressure doesn t go down 4 Press black red button during operation to end pump out IDU ODU off Kl gt Emil Copyright 2011 LG Electronics Inc All right reserved 42 Only for traini
91. of control board 1 Hot gas bypass valve 1 To get rid of the difference of high and low pressure of system after stop operating the compressor turn the valve on after 15 seconds 2 Turn the hot gas valve on if the temperature of compressor suction pipe is lower than ranged temperature 3 Hot gas valve can be kept on by the condition of cycle operation this does not indicate the breakdown of the unit 4 The change of the operation condition by the operation of solenoid valve can be checked by the before and behind temperature of bypass piping and the sound of refrigerant 5 Insulation resistance in the state of connecting the valve to coil should be over 100mQ when measure it with DC mega tester DC 500V 2 Oil solenoid valve 1 It is located in the bottom of accumulator and it starts operating after some period of time of the compressor opera tion to provide oil stored in the bottom of the accumulator to the compressor 2 When the compressor starts operating oil solenoid valve will be on for 2 minutes Check if there is operation noise or piping vibration on the solenoid valve 3 It turns on right after the compressor stop operating 4 Solenoid valve can turn on and off repeatedly by the condition of cycle operation this does not indicate the break down of the unit 5 Insulation resistance in the state of connecting the valve to coil should be over 100mQ when measure it with DC mega tester DC 500V Copyright 201
92. oltage Error Voltage Error deig ee Snes Mer SUNS Master Outdoor Unit Fan Current is over 10A Tan 7 se ko Fagin vet unten Slave1 Outdoor Unit Fan is over 10A abe SCOP ee Slave2 Outdoor Unit Fan is over 10A a bg EG Master Outdoor Unit Fan First Position Sensing Failure oO c 7 9 ee eeo CAE AA SAR alte Slave1 Outdoor Unit Fan First Position Sensing Failure D D D En ar a ralllte Slave2 Outdoor Unit Fan First Position Sensing Failure O Master Outdoor Unit Main PCB EEPROM Communication Fail Between Master Outdoor Unit Main Error MICOM and EEPROM or omitting EEPROM 3 6 Slave1 Outdoor Unit Main PCB EEPROM Communication Fail Between Slave1 Outdoor Unit Main MICOM and EEPROM or omitting EEPROM Communication Fail Between Slave2 Outdoor Unit Main MICOM and EEPROM or omitting EEPROM Communication Fail Between Master Outdoor Unit Fan MICOM and EEPROM or omitting EEPROM Communication Fail Between Slave1 Outdoor Unit Fan MICOM and EEPROM or omitting EEPROM Communication Fail Between Slave2 Outdoor Unit Fan MICOM and EEPROM or omitting EEPROM 78 LGE Internal Use Only Display Title Self diagnosis function Cause of Error Communication Error Between Master Outdoor Unit and Other Outdoor Unit Failing to receive Slave Unit signal at main PCB of Master Outdoor Unit Communication Error Between Slave1 Outdoor Unit and Other Outdoor Unit Failing to receive master and other Slave Unit signal at
93. onditions gt Rewire them if abnormality found Are there any power wire connections normal Check R S S T T R phase voltage is 220V 10 gt Check connection condition and wiring if power is Is inout voltage normal p 9 abnormal Is inverter PCB assembly normal Replace inverter PCB assembly Recheck power and Dinstallation condition Measuring input voltage Noise filter wiring Noise filter input upper part Noise filter output lower part Copyright 2011 LG Electronics Inc All right reserved 100 og LGE Internal Use Only Only for training and service purposes Error Type 29 Master 291 Slave 292 Slave2 293 Inverter compressor over Inverter compressor input current current is over 40A Troubleshooting Guide Error Point Main Reasons Overload operation Pipe clogging Covering EEV defect Ref overcharge Compressor damage Insulation damage Motor damage Input voltage low ODU inverter PCB assembly damage E Error Diagnosis and Countermeasure Flow Chart Is installation condition normal Are the resistance Between each phase and insulation resistance of Inverter compressor normal Is compressor Wire connection condition normal No Yes l No Is input voltage normal Yes No Is inverter PCB assembly normal Yes Recheck power and Dinstallation condition Copyright 2011 LG Electronics Inc All righ
94. operation to confirm proper in cooling mode bad ventilation around motor functioning Switch OFF the outdoor operation outdoor heat exchanger unit and remove obstacles if any around the HEX Check connector Outdoor fan Heating failure fre Bad connector contact Check resistance between terminals quent defrosting No operation sound Coil failure Service necessary Outdoor after switching ON EEV the power supply Heating failure EEV clogged Service necessary frozen outdoor heat exchanger part Low pressure error EEV clogged or discharge temper ature error When system fault occurs the error code is displayed on the indoor unit display or remote control display The trouble shooting guide is available in the service manual e When CH05 53 11 ERROR occurs check if auto addressing has done and communication wiring is ok Copyright 2011 LG Electronics Inc All right reserved 5 7 og LGE Internal Use Only Only for training and service purposes Checking Method for Key Components he 2 Checking Method for Key Components Check and ensure in following order when error related with the compressor or error related with power occurs during operation Is how long power on during operation Does failure appears again when starting operation Method to measure insulation resistance Tester 1 ay sige Figure 1 Method to measure coil resistance 2 Power on for 12 hours or less 1 The co
95. or Unit Fan DC Link Input Voltage is under 140V Liquid pipe temperature sensor of Master Outdoor Unit is open or short Liquid pipe temperature sensor of slave1 Outdoor Unit is open or short Liquid pipe temperature sensor of slave2 Outdoor Unit is open or short 79 LGE Internal Use Only Self diagnosis function Title Cause of Error 10 149 pajeje JUN JOOPINQ Copyright 2011 LG Electronics Inc All right reserved Display 115 5 1 rae 114 Master Outdoor Unit Subcooling Outlet Temperature Sensor Error Master Outdoor Unit Subcooling Outlet Temperature Sensor open or short Slave1 Outdoor Unit Subcooling Outlet Temperature Sensor Error Slave2 Outdoor Unit Subcooling Outlet Temperature Sensor Error Failure of operation mode conversion at Master Outdoor Unit Failure of operation mode conversion at Slave1 Outdoor Unit Failure of operation mode conversion at Slave2 Outdoor Unit Master outdoor unit constant speed Compressor Fault Slave1 outdoor unit constant speed Compressor Fault Slave2 outdoor unit constant speed Compressor Fault Master outdoor unit rated speed 2 con denser over current Slave1 outdoor unit rated speed 2 con denser over current Slave2 outdoor unit rated speed 2 con denser over current Only for training and service purposes Slave1 Outdoor Unit Subcooling Outlet Temperature Sensor open or short Slave2 Outdoor Unit Subcooling Outlet Temperatur
96. ound 2 Check fan motor wire disconnection Replace ODU fan motor if abnormality found 1 Check fan PCB connector condition Reassemble if abnormality found 2 Check assemble condition between fan PCB and Heatsink gt Reassemble heatsink if abnormality found Check short of Heat sink temperature sensor Resistance 10kQ 5 at 25 C Replace sensor when abnormality found Replace fan PCB assembly Fan IPM assemble position Check assemble condition Copyright 2011 LG Electronics Inc All right reserved 129 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error Type Error Point Main Reasons 1 Wrong wiring between inverter PCB and 107 Master Fan PCB 112 071 Fan DC Link Low Fan PCB DC link voltage supplied 2 Fan PCB assembly defect 12 gt 072 Voltage Error below 140V 3 Reactor terminal contact defect os 4 DC link terminal wiring contact defect 5 Bridge diode defect E Error Diagnosis and Countermeasure Flow Chart 1 Check DC_Link Wire connection 2 DC_Link gt Replace wire if abnormality found Is wiring between fan motor and PCB normal Measure DC_Link voltage gt Check inverter PCB if voltage is below 140V Replace fan PCB assembly Is DC_Link voltage normal Is Fan PCB assembly normal Yes Recheck power and installation condition DC voltage connection DC Volt connected Copyright
97. outdoor unit Omitting connection of R S T power of Slave1 Outdoor Unit Omitting connection of R S T power of Slave2 Outdoor Unit Omitting connection of Slave1 Outdoor Unit Omitting connection of Slave2 Outdoor Unit Excessive capacity of indoor units Communication error inverter PCB gt Main PCB Excessive connection of indoor units compared to capacity of Outdoor Unit Failing to receive inverter signal at main PCB of Master Outdoor Unit Communication error inverter PCB gt Main PCB Failing to receive inverter signal at main PCB of Slave Outdoor Unit Communication error inverter PCB gt Main PCB Communication error indoor unit gt main PCB of Outdoor Unit Failing to receive inverter signal at main PCB of Slave2 Outdoor Unit Failing to receive indoor unit signal at main PCB of Outdoor Unit Master Outdoor Unit Communication Error with Inverter Controller Slave1 Outdoor Unit Communication Error with Inverter Controller Master Outdoor Unit Controller part cannot receive inverter control signals usually happens after on boarding Slave1 Outdoor Unit Controller part cannot receive inverter control signals usually happens after on boarding Slave2 Outdoor Unit Communication Error with Inverter Controller Mixing Installation of Sub Outdoor Unit Only for training and service purposes Slave2 Outdoor Unit Controller part cannot receive inverter control signals
98. pear at LGMV may have following problems wrong connection of communication cable or power cable fault of power PCB communication cable duplication of indoor unit number If communication is not doing well wholly then the Auto Addressing is not done The case that CH53 appear at indoor unit also Auto Addressing is not done so indoor unit address may be duplicated After replacement of indoor unit PCB Auto Addressing should be done if central controller is installed then the central control address also should be input In case that only communication PCB is replaced above process is not needed Copyright 2011 LG Electronics Inc All right reserved 113 A LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons No 57 1 Bad Connection Between Inv and Main l Failing to receive inverter Master 571 Communication error signal at main PCB of 2 Communication Wire Noise Effect Slave1 572 Main PCB lt Inverter PCB outdoor Unit 3 ODU Main PCB Damage Slave2 573 4 ODU Inv PCB Damage E Error diagnosis and countermeasure flow chart Are there any No communication wire 1 Check communication wiring conditions connections normal 2 Check connector conditions Rewire them if abnormality found Yes Yes Is inverter PCB Te No 1 Replace Inverter PCB normal Is there any error ven 1 Replace Main PCB when powe
99. r hot air from the outdoor unit could damage the neighborhoods It may cause a problem for your neighbors Do not install the unit where combustible gas may leak accumulates around the unit an explosion may result LGE Internal Use Only Use power cables of sufficient current carrying capacity and rating e Cables that are too small may leak generate heat and cause a fire aa Keep the unit away from children The heat exchanger is very sharp It can cause the injury such as cutting the finger Also the damaged fin may result in degradation of capacity ar A Safety Precautions Do not use the product for special purposes such as preserving foods works of art etc It is a consumer air conditioner not a precision refrigeration system e There is risk of damage or loss of property When installting the unit in a hospital com munication station or similar place provide sufficient protection against noise The inverter equipment private power generator high frequency medical equipment or radio com munication equipment may cause the air condition er to operate erroneously or fail to opera
100. r reset No Recheck power and installation condition Inverter Fan PCB Main PCB Copyright 2011 LG Electronics Inc All right reserved 114 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons Series Installation of Slave Series Installation Outdoor Unit Larger Than 1 Dip Switch Setting Error Error Master Capacity E Error Diagnosis and Countermeasure Flow Chart Is Dip switch No 1 Set the most setting normal Capacitor ODU for Master Yes Are there setting with No C Master Slave1 Slave2 gt Set with Master gt Slave1 gt Slave2 gt Slaver3 Slaver3 4 Yes Is there any error when No 1 Replace Main PCB power reset Yes Recheck installation condition Dip Switch Setting Slave1 V 2 3 4 5 6 57 5 6 7 8 9 10 11 12 13 14 Slave2 UME 7 UU 3 4 5 6 7 6 r 8 9 10 11 12 13 14 Copyright 2011 LG Electronics Inc All right reserved 115 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 60 1 EEPROM contact defect wrong insertion Master 601 Ur ER EEE aa aide erica 2 Different EEPROM Version Slave1 602 me 3 ODU inverter PCB assembly damage Slave2 603 E Error Diagnosis and Countermeasure Flow Chart 1 Check EEPROM insert direction connection condition Is EEPROM insertion norma
101. red value is different from the table set multi tester to resistance mode and measure If the value is small 0 Q or high hundreds M Q PCB needs to be replaced 6 In case that bridge diode is damaged check if inverter PCB assembly IPM is needed to be replaced Diode terminal terminal black terminal red Tester terminal R red 0 4V 0 7V S red 0 4V 0 7V T i red 0 4V 0 7V R black 0 4 V 0 7 V S EED 0 4 V 0 7 V T ant 0 4V 0 7V x Red and black are the measuring terminals of multi tester caution e Check the electric parts of c box 10 minutes after switching off the main supply and checking DC voltage is discharged Otherwise there is chance of getting electric shock There is chance of electric shock by charged voltage Copyright 2011 LG Electronics Inc All right reserved 63 ge LGE Internal Use Only Only for training and service purposes Checking Method for Key Components 2 5 Inverter IPM Checking CN R2 Output CN R1 Input CN T1 Input CN T2 Output N Terminal U Terminal V Terminal W Terminal CN P1 DC Wait until inverter PCB DC voltage gets discharged after the main power switch off Pull out CN P1 CN N connectors and U V W COMP connector connected with the inverter PCB Set multi tester in diode mode Measured value should be 0 4 0 7V measuring as below table nr W N In
102. relay turn on System is turned off by Master Outdoor Unit high pressure Switch System is turned off by slave1 Outdoor Unit high pressure Switch System is turned off by slave2 Outdoor Unit high pressure switch Master Outdoor Unit input voltage is over 300V or below 140V Slave1 Outdoor Unit input voltage is over 300V or below 140V Slave2 Outdoor Unit input voltage is over 300V or below 140V The First Start Failure by Master Outdoor Unit Inverter Compressor Abnormality ol gl The First Start Failure by Slave1 Outdoor Unit Inverter Start Failure Compressor Abnormality 3 Slave2 Outdoor Unit Inverter Compressor The First Start Failure by Slave2 Outdoor Unit Inverter Start Failure Compressor Abnormality i Master Outdoor Unit Inverter DC link High System is turned off by Master Outdoor Unit DC Voltage Voltage Over Charging olgil Slave1 Outdoor Unit Inverter DC link High System is turned off by Slave1 Outdoor Unit DC Voltage Voltage Over Charging 3 Slave2 Outdoor Unit Inverter DC link High System is turned off by Slave2 Outdoor Unit DC Voltage Voltage Over Charging i Master Outdoor Unit Inverter Compressor Master Outdoor Unit Inverter Compressor Fault OR Drive Over Current Fault 2 lolo Slave1 Outdoor Unit Inverter Compressor Slave1 Outdoor Unit Inverter Compressor Fault OR Drive Over Current Fault 3 Slave2 Outdoor Unit Inverter Compressor Slave2 Outdoor Unit Inverter Compressor Fault OR Drive Over Curre
103. right 2011 LG Electronics Inc All right reserved 110 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 1 130 more than outdoor unit rated capacity Over Capacity 2 Wrong connection of communication Sum of indoor unit capaci Sum of indoor unit capaci cable piping ty is more than outdoor ty exceed outdoor unit 3 Control error of slave outdoor unit Dip switch capacity capacity specification 4 Power supply defect of slave unit PCB 5 Defect of outdoor unit PCB E Error diagnosis and countermeasure flow chart Is capacity sum of indoor units less than 130 of outdoor unit capacity at LGMV Are quantity and capacity Check communication cables of indoor units installed between indoor and outdoor same as the data of LGMV units No Yes Adjust the capacity of indoor and outdoor unit Yes Check following dip S W setting is on Slave1 No 5 7 Slave2 No 6 7 Slave3 No 5 6 7 No Adjust corresponding DIP switch Is power of Slave PCB Supply main On Check LED blinking power again Is main power really supplied Terminal Block T N Yes Check and replace PCB Line Fuse Transformer Re connect Is communicationmis amp ig cables between outdoor units connected correctly Is error code released in order Slave2m Slave 1 Main after power reset
104. rmal refer refrigerant part No Adjust refrigerant amount Yes Is fan normal Indoor fan during heating Outdoor fan during cooling No Replace related parts Refer to Error 105 107 Yes Is filter blocked Heating indoor Cooling outdoor heat exchanger No Clean indoor filter heating outdoor heat exchanger cooling Yes Is value of high pressure sensor same as Manifold value ls it high actually No Replace sensor of high pressure Yes Check indoor unit LEV Check indoor unit PCB Check in outdoor installation condition Copyright 2011 LG Electronics Inc All right reserved 104 Only for training and service purposes LGE Internal Use Only Error Type Troubleshooting Guide Error Point Main Reasons 35 Master 351 Slave1 352 Slave 553 Excessive drop of discharge pressure of compressor Is service valve opened Yes Are communication cable piping normal Yes Is amount of refrigerant normal refer refrigerant part No Yes Is fan normal in heating outdoor fan in cooling indoor fan No Yes No Is strainer Ok Yes Are the values of manifold and low pressure sensor same Is the low pressure value actually low No Yes Check indoor outdoor unit LEV Check Indoor unit PCB Check indoor outdoor unit installation conditions Copyright 2011 LG Elect
105. rmality found Is wire connection of ODU Fan Motor wire normal Yes Is Fan PCB assembly normal Replace Fan PCB assembly Recheck power and installation condition Fan Motor resistance measuring Hall Sensor connector between each phase Fan Motor Wire connection Copyright 2011 LG Electronics Inc All right reserved 117 Only for training and service purposes LGE Internal Use Only Troubleshooting Guide Error Type Error Point Main Reasons 69 Master 691 Constant 1 CT Sensor Slave1 692 Error of Outdoor Unit Slave2 693 Constant 1 CT Sensor open or short of Outdoor Constant 1 CT Sensor Error Unit 70 Constant Speed Constant Speed Master 701 Compressor 2 CT Compressor 2 CT Sensor di Fr Speed Compressor 2 CT Sensor Slave1 702 Sensor Error Open short EIES Slave2 703 E Error Diagnosis and Countermeasure Flow Chart Is constant speed compressor CT Sensor connection condition normal Check constant speed compressor CT Sensor wiring condition and locking Yes Recheck power and installation condition Copyright 2011 LG Electronics Inc All right reserved 118 og LGE Internal Use Only Only for training and service purposes Error No 73 Master 731 AC input instant over cur rent error Matter of soft Slave1 732 ware Slave2 733 Error Type Troubleshooting Guide Error Point Main Reasons 1 Overload operation Pipe clog ging
106. rnal Use Only Function 4 2 Emergency operation If acompressor is out of order the system can be run except the defective compressor by backup function E Automatic emergency operation automatic back up function If outdoor unit detect comp defect during operation automatic back up mode is set 1 Inverter compressor automatic emergency operation 2 Constant compressor automatic emergency operation B Manual emergency operation Manual back up function 1 Check which compressor is broken refer to Trouble Shooting Guide 2 Turn off the power 3 Set the dip S W of defective outdoor unit Inverter compressor defect dip S W No 3 Unit defect dip S W No 4 4 Turn on the power MASTER SLAVE1 SLAVE2 INV C1 INV C1 INV C1 DIP switch of Slave1 1234 5 67 Inverter MASTER SLAVE1 SLAVE2 compressor 11 ma 3 fail of Slave1 an DIP switch of Slave2 8 9 10 11 12 13 14 MASTER SLAVE SLAVE2 Unit fail of hm Ka LD EEE CAUTION Emergency operation with inverter compressor failure should not last 48 hours gt It causes other compressor failure During the emergency operation cooling heating capacity may be lower Copyright 2011 LG Electronics Inc All right reserved 31 iz LGE Internal Use Only Only for training and service purposes Function 4 3 Sensor checking function noe If you set the Dip switch when power is on the changed setting will not be appl
107. rocess of judging refrigerant amount if the cycle isn t stable refrigerant checking function may end without performing refrigerant checking Copyright 2011 LG Electronics Inc All right reserved 36 og LGE Internal Use Only Only for training and service purposes Function caution 1 Guaranteed Temperature range Error occurs out of guaranteed temperature range IDU 20 35 C ODU 0 43 C 2 Set IDU wired remote controller temperature sensor setting as IDU 3 Make certain that IDU doesn t run with thermo off mode during operation Error contents about auto refrigerant charging function 1 EEE Temperature Range Error In case that IDU or ODU is out of range 2 ERE System Unstable Error In case After 45 min operating the system it does not be stable How to Cope with Result of Refrigerant checking 1 If the temperature is not in guaranteed Temperature range the system will not execute Refrigerant check ing and the system will be OFF 2 Excess of Refrigerant 619 After remove the 20 of calculated total refrigerant recharge the refrigerant by using Refrigerant Auto Charging Function Scarcity of Refrigerant 629 Charge the refrigerant by using Refrigerant Auto Charging Function Impossible to Judge 639 IF the system is not in order check the other problem except refrigerant Copyright 2011 LG Electronics Inc All right reserved 37 iz LGE Internal Use Only Only for training
108. ronics Inc All right reserved Only for training and service purposes 1 Defective low pressure sensor 2 Defective outdoor indoor unit fan 3 Refrigerant shortage leakage 4 Deformation because of damage of refrigerant pipe 5 Defective indoor outdoor unit EEV 6 Covering clogging outdoor unit covering during the cooling mode indoor unit filter clogging during heating mode 7 SVC valve clogging 8 Defective outdoor unit PCB 9 Defective indoor unit pipe sensor Error happens because of 3 times successive compres sor off due to exces sive drop of low pres sure by the low pres sure sensor E Error diagnosis and countermeasure flow chart Open service valve check communication piping correction Is there pipe crack or trace Ne of refrigerant leakage Adjust the amount of refrigerant Additive charge Yes Weld reconnect the cracked portion and recharge refrigerant Check and replace related parts error 105 108 reference Replace the strainer Replace the pressure sensor If the temperature difference between inlet and outlet of strainer is so large that frost or ice formation can be seen or confirmed then clogging of strainer should be checked Notice it is not full ice forming of strainer in case that there is not at inlet portion but at outlet portion 105 ue LGE Internal Use Only Troubleshooting Guide Error Type Error Point Main Reasons 40 Master 401 Slave M
109. ror Point Main Reasons 1 Constant speed compressor 1 dam Outdoor Unit Constant Outdoor Unit Constant age Speed Compressor 1 Speed Compressor 1 Fault 2 Constant speed compressor 1 input Over Current or Drive Fault over current 3 Discharge temperature sensor defect 173 Master 11 gt 731 Slave1 12 gt 732 Slave2 13 gt 733 1 Constant speed compressor 2 dam Outdoor Unit Constant Outdoor Unit Constant age Speed Compressor 2 Speed Compressor 2 Fault 2 Constant speed compressor 2 input Over Current or Drive Fault over current 3 Discharge temperature sensor defect 174 Master 11 gt 741 Slave1 12 gt 742 Slave2 13 gt 743 Error diagnosis and countermeasure flow chart Is resistance value insulation amp phase to phase of corresponding constant compressor normal refer electric component part No Replace constant compressor Yes No Is cables connection Adjust connection of cables of compressor normal Is discharge temperature sensor of compressor normal refer electric component part No Replace discharge cables connection between constant ee Hel compressor and magnetic switch Yes Replace outdoor unit PCB Copyright 2011 LG Electronics Inc All right reserved 134 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error No Error Type Error Point Main Reasons 182 Communication Error
110. rost Static pressure mode Nigh fw noise operation Coding on Eel Night low noise operation Cooling Heating Pump down Pump out Forced oil return operation fa Je f Vacuum mode fF felpx x Only overall defrost Selector Fan All OFF x x x ODU Address setting xX Master unit xix x TT Slave 1 unit lejxje f Slave 2 unit xio o Function x Xx 6 Xx x ODU setting CAUTION 1 X mark within the table means that the dip switch must be pulled down If not the function may not work properly 2 If the applicable dip switch is not set properly the product may not work properly 3 When executing the test operation check the operating condition of the indoor unit and only execute the operation when all indoor units are stopped 4 Auto test operation function does not work for the product where only one indoor unit is connected 5 Cooling Only model is not working on functions of Heat Pump model Copyright 2011 LG Electronics Inc All right reserved 54 og LGE Internal Use Only Only for training and service purposes shooting guide Copyright 2011 LG Electronics Inc All right reserved 59 Only for training and service purposes LGE Internal Use Only Trouble shooting guide 1 The phenomena from main component failure 59 2 Checking Method
111. rter Compressor CT Sensor open CT Sensor Fault or short Slave1 Outdoor Unit Inverter Compressor Slave1 Outdoor Unit Inverter Compressor CT Sensor open CT Sensor Fault or short Slave2 Outdoor Unit Inverter Compressor Slave2 Outdoor Unit Inverter Compressor CT Sensor open CT Sensor Fault or short Master Outdoor Unit Inverter Compressor Master Outdoor Unit Inverter Compressor Discharge Discharge Temperature Sensor Fault Temperature Sensor open or short Slave1 Outdoor Unit Inverter Compressor Slave1 Outdoor Unit Inverter Compressor Discharge Discharge Temperature Sensor Fault Temperature Sensor open or short Slave2 Outdoor Unit Inverter Compressor Slave2 Outdoor Unit Inverter Compressor Discharge Discharge Temperature Sensor Fault Temperature Sensor open or short O c S 1 o Se Master Outdoor Unit Low Pressure Sensor open or short Oo c FV A 2 aid el Slave1 Outdoor Unit Low Pressure Sensor open or short D D D D 3 aang EO SIEM Ieee sue aie Slave2 Outdoor Unit Low Pressure Sensor open or short O be ON ON eee See Master Outdoor Unit High Pressure Sensor open or short ner per eeh Slave1 Outdoor Unit High Pressure Sensor open or short at EU aide ee Slave2 Outdoor Unit High Pressure Sensor open or short NE a A e a Master Outdoor Unit Air Temperature Sensor open or short Sensor Fault OG Slave1 Outdoor Unit Air Temperature Sensor open or short Sensor Fault Spaa Ween Slave2 Outdoor Unit Air Te
112. rved 109 og LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons 1 Input Voltage abnormal R S T ODU 3phase power omis Omitting one or more of 2 Check power Line connection condition sion error R S T input power 3 Main PCB damage 4 Inverter PCB input current sensor fault Error Diagnosis and Countermeasure Flow Chart Are there any power wire connections normal Yes 4 1 Check resistance between each terminal of compressor Are the resistance 0 172 0 173Q 7 Between each phase and 2 Check insulation resistance between compressor insulation resistance of Inverter terminal and pipe over SOM compressor normal Replace compressor if abnormality found 1 Check R S T wiring conditions gt Rewire them if abnormality found 1 Check inverter PCB assembly U V W connector Is compressor connection condition Wire connection 2 Check wire disconnection and wiring condition normal 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly if abnormality found Is inverter PCB assembly normal Recheck power and Dinstallation condition Measuring input voltage Noise filter wiring Main PCB power connection Field Fault Case R Phase Terminal Changed Color Copy
113. sition wm short 0 ohm Remove it amp clean the pump If the float goes up higher than a half of float switch then the circuit is open amp the unit is stopped automatically i D EIENEN EN float Condensate water Copyright 2011 LG Electronics Inc All right reserved 84 F LGE Internal Use Only Only for training and service purposes Troubleshooting Guide float A Point to check rotating Indoor PCB drain pump connector Check input of 220V Marked as CN DPUMP Standard of drain pipe head height slope d 1 50 1 100 MAA 700mm Copyright 2011 LG Electronics Inc All right reserved 85 ge LGE Internal Use Only Only for training and service purposes Troubleshooting Guide Error Type Error Point Main Reasons Auto addressing is not done Communication cable is not connected Short circuit of communication cable No signal communication 4 Indoor unit communication circuit fault between indoor amp outdoor 5 Outdoor unit communication circuit fault units Not enough distance between power and com munication cable Indoor amp Outdoor unit communication error E Error diagnosis and countermeasure flow chart Replace the PCB of indoor unit No displayed error Re connect after check the No Is total number of indoor units connected displayed after auto addressing Does all the IDUs show same error code CH05 com
114. sor 32 Master 321 Slave1 322 Slave2 323 Over increase discharge temperature of inverter com pressor at main outdoor unit System is turned off by Master Outdoor Unit 1 Constant Speed Compressor 2 Discharge Constant Temperature Sensor Fault Speed Compressor 2 2 Refrigerant Short Leakage Discharge Temperature 3 EEV Fault Sensor Temperature sensor defect of inverter com Compressor is off pressor discharge pipe because of over increase gt Refrigerant shortage leak discharge temperature of EEV defect inverter compressor ae P Liquid injection valve defect 33 Over increase discharge Master 331 temperature of constant Slave 332 compressor 1 at main con stant outdoor and sub con Slave2 333 stant outdoor unit Compressor is off Temperature sensor defect of constant because of over increase compressor 1 discharge pipe discharge temperature of 2 Refrigerant shortage leak constant compressor 1 at 3 EEV defect main and sub outdoor unit 4 Liquid injection valve defect E Error diagnosis and countermeasure flow chart Is the amount of No refrigerant normal refer refrigerant part Yes Change the amount of refrigerant Charge additive amount Is there pipe crack No or trace of leakage Yes Weld reconnect the cracked portion and recharge refrigerant Is the resistance of discharge No Replace discharge temperature sensor normal temperature sensor Wes
115. sure C 3 Avoiding excessive high discharge temperature when main EEV opens some given opening R22 1000pls R410A 800 pls and discharge temperature is above 90 C in heating operation subcooling EEV may control the subcooling out temperature evaporating temperature to be some given difference Copyright 2011 LG Electronics Inc All right reserved 21 Only for training and service purposes LGE Internal Use Only Function 2 1 Oil return control 2 Special control 2 1 1 Oil return control on cooling mode Oil return operation recovers oil amount in compressor by collecting oil accumulated in pipe Each cycle component operates as shown on the below table during oil return operation Outdoor Unit Inv Compressor Starting 30Hz Running Setting Value 30Hz Constant Speed Compressor OFF ON OFF FAN Main EEV Subcooling EEV Normal control Max pulse Normal control Normal control Max pulse Min pluse Normal control Max pulse 85 pulse 4way valve Hot gas bypass valve Indoor Unit Component Fan OFF Normal control Starting Normal control OFF Normal control Running OFF OFF Normal control Normal control Thermo on unit EEV Thermo off unit EEV Normal control 40 pulse Oil return signal OFF ON OFF M Oil return operation time 3 min for running step M Starting condition every 8 hours operate M Oi
116. t an Authorized Service Center e There is risk of fire or electric shock Take care to ensure that nobody could step on or fall onto the outdoor unit e This could result in personal injury and product damage Be cautious not to touch the sharp edges when installing It may cause injury AN del i Lip MI Ne Var An a N va va IE N 7 AREN NAA AAA 13 f D Do not open the inlet grille of the product during operation Do not touch the electro static filter if the unit is so equipped e There is risk of physical injury electric shock or product failure CAUTION B Installation Always check for gas refrigerant leakage after installation or repair of product e Low refrigerant levels may cause failure of product Keep level even when installing the product To avoid vibration or water leakage iM aS gt VI tele es S TERR of ff Moa ELIS 7 WALLA 17771 N Copyright 02011 LG Electronics Inc All right reserved Only for training and service purposes If the gas leaks and Do not install the product where the noise o
117. t reserved Only for training and service purposes 1 Check Pipe clogging distortion 2 Check Covering Indoor Outdoor Unit 3 Check EEV connector assemble condition normal operation 4 Check refrigerant pressure gt Reassemble or manage if abnormality found 1 Check resistance between each terminal of compressor U V 0 1790 7 V W 0 1780 7 W U 0 1780 7 25 C 2 Check insulation resistance between compressor terminal and pipe over 50M gt Replace compressor if abnormality found 1 Check inverter PCB assembly U V W connector connection condition 2 Check wire disconnection and wiring 3 Check compressor terminal connection condition bad contact gt Reassemble if abnormality found Check R S S T T R phase voltage is 220V 10 Check connection condition and wiring if power is abnorma Check inverter PCB assembly IPM normality gt Replace inverter PCB assembly 101 LGE Internal Use Only Troubleshooting Guide Measuring resistance between each Compressor wire connection terminal of compressor en En rl J Pee en gt l Copyright 2011 LG Electronics Inc All right reserved 102 Only for training and service purposes LGE Internal Use Only Error No Error Type Troubleshooting Guide Error Point Main Reasons Master Outdoor Unit 30 Constant Master 301 Slave 302 Speed Compressor 2 Slave 303 Discharge Temperature Sen
118. te On the other hand the air conditioner may affect such equipment by creating noise that disturbs medical treatment or image broadcasting IQ VI A Do not install the product where it is exposed to sea wind salt spray directly e It may cause corrosion on the product Corrosion particularly on the condenser and evaporator fins could cause product malfunction or inefficient operation Copyright 2011 LG Electronics Inc All right reserved Only for training and service purposes LGE Internal Use Only Safety Precautions E Operation Do not use the air conditioner in special Do not block the inlet or outlet environments e Oil steam sulfuric smoke etc can significantly It may cause failure of appliance or accident reduce the performance of the air conditioner or damage its parts gt Make the connections securely so that the Be sure the installation area does not deteri outside force of the cable may not be applied orate with age to the terminals Inadequate connection and fastening may gen If the base collapses the air conditioner could erate heat and cause a fire fall with it causing property damage product failure or personal injury Install and insulate the drain hose to ensure that water is draine
119. tes unit number Ex 211 No 21 error of master unit 213 No 21 error of slave2 011 051 No 105 error of master unit Refer to the DX Venitilation manual for DX Venitilation error code Display Title Cause of Error 0d Air temperature sensor of indoor unit Air temperature sensor of indoor unit is open or short 0 2 Inlet pipe temperature sensor of indoor unit Inlet pipe temperature sensor of indoor unit is open or short 03 Communication error wired remote con Failing to receive wired remote controller signal in indoor 3 troller indoor unit unit PCB O S 0 4 Drain pump Malfunction of drain pump To z Communication error outdoor unt paring to receive outdoor unit signal in indoor unit PCB Z indoor unit 0 6 Outlet pipe temperature sensor of indoor Outlet pipe temperature sensor of indoor unit is open or unit short O In case when the serial number marked on EEPROM of ee nn Indoor unit is 0 or FFFFFF Disconnecting the fan motor connector Failure of indoor 1 0 Poor fan motor operation fan motor lock 1 7 Inlet Air temperature sensor of FAU Air temperature sensor of indoor unit is open or short Mase SUID A Vener Gomes Master Outdoor Unit Inverter Compressor Drive IPM Fault IPM Fault O G 2 1 2 OOP Crit tienen GIES Slave1 Outdoor Unit Inverter Compressor Drive IPM Fault En PM Fault e P AVOA EOE MIE VEREK me Slave2 Outdoor Unit Inverter Compressor Drive IPM
120. ts on heating mode This function check only normal condition of parts on heating mode e Saved data can check using LGMV Error Display Note 1 1 IDU operation Press the black button for 2 sec after turning off all of Dip switch Completed 1 IDU operation data 10min DIP Switch Settings Warning Please reset Main PCB before starting this function Note 1 Judge the normal condition refer to report of Test Running Copyright 2011 LG Electronics Inc All right reserved 39 og LGE Internal Use Only Only for training and service purposes Function CAUTION 1 Guaranteed Temperature range Error occurs out of guaranteed temperature range IDU 20 35 C ODU 0 43 C 2 Set IDU wired remote controller temperature sensor setting as IDU 3 Make certain that IDU doesn t run with thermo off mode during operation Error contents about auto refrigerant charging function i EEE Temperature Range Error In case that IDU or ODU is out of range 2 504 System Unstable Error In case After 45 min operating the system it does not be stable How to Cope with Result of Refrigerant checking 1 If the temperature is not in guaranteed Temperature range the system will not execute Refrigerant check ing and the system will be OFF 2 Excess of Refrigerant 619 After remove the 20 of calculated total refrigerant recharge the refrigerant by using Refrigerant Auto Charging Function
121. urposes LGE Internal Use Only Function 2 Step 2 Communication check If all model code is displayed in 7 segment including all Slave unit communication between outdoor units is normal If 104 is displayed in 7 segment check communication wires between outdoor units and Dip switch setting 3 Step 3 PCB error check After 40 sec error check begins B Master Slave unit All errors of units including Slave units are displayed in 7 segment If communication between main PCB and inverter PCB isn t normal 52 is displayed in 7 segment If communication between main PCB and fan PCB isn t normal 105 is displayed in 7 segment If error is displayed check corresponding wires 4 Step 4 Auto addressing of indoor units Auto addressing begins when address red button in Main PCB is pressed for 6 sec During auto addressing 7 segment on main PCB displays 88 After auto addressing the number of indoor units is displayed in 7 segment for 30 sec The address of each indoor unit is displayed on each wired remote controller Push address red button for 6 sec ssec O Auto address starts BB Auto address is in progress max 15 min 35 indoor units found Auto address process is finished Every indoor unit displays its address on wired remote controller and the 7 segment of main PCB is off Copyright 2011 LG Electronics Inc All right reserved 30 Only for training and service purposes LGE Inte

Safety Precautions - LG HVAC VRF Systems

Contents

Download Pdf Manuals

Related Search

Related Contents