Ductless HVAC & PTAC Error Codes - Life`s Good! Home or office
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1. Too much combined capacity of IDUs in relation to ODU 130 maximum IDU EEPROM is small PCB the size of your thumbnail Part will be referred to as PCB Options on LG s parts system Reactor or electronic noise filter failure Copper coil around magnet in ODU replace this item Same error code as 13 Compressor Phase Current Error see error code 14 Child Lock Press Timer amp Min buttons simultaneously for 5 seconds to engage disengage function Condensate pump float switch risen open Check drain pan is empty check pump is working OK If no pump ensure blue jumper plug is inserted in IDU PCB plug CN_FLOAT If applicable ensure Dry Contact Interface is in OFF condition Check status and adjust as necessary With Central Controller if ALL system functions are locked HL will appear and is not an error code Jet Cool Mode To cancel press Jet Cool Fan Speed or Set Temperature button PTAC set for wall mount thermostat by setting DIP switch 1 to on position DIP switch 1 off touch pad controls on unit DIP switch 1 on remote thermostat J PTAC Freeze Protection mode indoor air thermistor shows PCB room temp less than 5 C 40 F If room is not this temp air thermistor 5 6000 at RE PF 38 C 100 F amp 20 7000 at 10 C 50 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB Low speed fan on PTAC this is normal High speed fan on PTAC this is normal LAOOxHV L2. amp 10 0000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB 64 Error code not used Outdoor unit inverter heat sink temperature sensor fault Call LG Tech Support some models have replaceable heat sink thermistors and newer product does not 66 Error code not used e ODU fan motor not rotating or proving rotation Verify fan motor plugged in correctly amp fan rotates freely e Condensor Coil Pipe Sensor Temp Low opposite to Error Code 61 Code is sensed at ODU in cool mode amp IDU in heat mode Verify system is not This can be a failed motor failed board or motor could have failed and caused board failure as well 67 Verify 310V DC on motor wires separated by empty terminals on plug with motor plugged in OV DC failed PCB 310V DC likely failed motor Next step Unplug motor and manually spin the fan keep it spinning on same wires you just tested OV DC indicates motor failed and caused board failure 14 30V DC indicates a good motor 73 Inverter compressor drawing over 48 amps 89 Flex Multi LMUxxxHV units DIP Switch 3 on outdoor PCB needs to be in OFF position 63 65 73 Unplug thermistor from PCB place probe in cold or ice water measure the water temperature and compare ohm reading to ohm chart Repeat with hot water to verify thermistor accuracy across a broad temperature range LG Suction amp Liquid Line Thermistor Ohm Chart Suction amp L
3. 2A amp 2B on one terminal 3A alone 3B alone 3C alone 3D alone PTAC Mode error verify proper dip switch settings amp thermostat wiring if remote thermostat is used LAOOXxHV LA12xHV LS9O2HPV amp LS122HPV DC Peak Error OR condensor coil over 149 F Check all of the following For DC peak error verify proper 208V or 240V AC feeding unit verify 3 compressor wires not switched verify compressor not seized verify 1 4Q between all compressor terminals For condensor coil over 149 F verify outdoor liquid line thermistor in cooling mode or indoor coil thermistor in heating mode is accurate must be 2 8000 at 38 C 100 F amp 10 0000 at 10 C 50 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB Verify system is not undercharged undercharge will cause not only high condensor temperature but high compressor motor temperatures amp increase amperage If all options have been tried weigh out charge with electronic scale amp measure lineset length Charge on ODU label is for ODU IDU 25 lineset Charge is adjusted on these models at 22 ounces foot All other inverters PCB sees IDU outlet pipe thermistor as open or shorted Must be 2 800Q at 38 C 100 F amp 10 0000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB PTAC DIP switches 3 4 5 for temperature limiting are not set properly Your current setting has a conf
4. cicit 1 2 3 etc Heatin ED to digit 10 20 30 etc POWER E 1 digit 1 2 3 etc Plasma Plasma is Preheating on LGNxxxHSV models PLASMA eee PREHEATING am Single Zone HSV amp HSV2 Multi white indoor HSV amp HSV2 Multi mirror indoor 10 digit 10 20 30 etc 10 digit 10 20 30 etc 1 2 3 etc 1 2 3 etc 10 amp 13 SEER indoor units Single speed compressor 10 digit 10 20 30 wall errors shown indoors only not on outdoor unit Ceiling cassette indoor unit Inverter variable speed compressor units run on R 410a Always a V in the model number DO NOT use a volt meter that auto detects DC or AC you will mis diagnose the system 1 2 3 wire functions and voltages 1 120VAC 2 120V AC and common for communication 3 communication 1 2 Will be 208 230V 193 253 is acceptable range 2 3 Will be approximately 0 65V DC float Do not read 3 to ground it will not tell us what we need to know The 2 wire does have AC and DC voltage on it Generally speaking 0 or low constant voltage on 2 amp 3 will be a failed outdoor board and constant high voltage will be a failed indoor board 13 SEER single indoor single outdoor units run on R 410a 10 SEER single indoor single outdoor units run on R 22 Never a V in the model number 1 2 3 4 wire functions and voltages 1 fan 2 indoor unit power 3 indoor unit common 4 communication All DC voltage is measured to the 3 common wire 1 3 OV DV w
5. plug connection change PCB 10 amp 13 SEER PCB sees any ODU or IDU pipe thermistor OR air thermistor as open or shorted Pipe 5 0000 at 25 C 77 F amp 10 0000 at 10 C 50 F Air 10 0000 at 25 C 77 F amp 20 700Q at 10 C 50 F Ohm thermistor in water measure the water temperature with perfect thermistor amp plug connection change PCB PTAC PCB sees IDU pipe thermistor as open or shorted Pipe must be 2 8000 at 38 C 100 F amp 10 0009 at 10 C 50 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB 10 amp 13 SEER Flex Multi units no V in model number Different mode operation IDUs must be set all to heat or all to cool Inverter units with V in model Communication error between IDU amp hard wired controller Ensure only LG factory wire is used amp properly plug connection from IDU PCB wire stub wire controller PTAC PCB sees outdoor air thermistor as open or shorted Must be 5 6000 at 38 C 100 F amp 20 7000 at 10 C 50 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB LAOOxHV LA12xHV LS902HPV amp LS122HPV ODU PCB Heat Sink thermistor open shorted or over heated to 95 C Must be 5 6000 at 38 C 100 F amp 20 7009 at 10 C 50 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB IDU Condensate pump float switch
6. risen opened Check drain pan is empty amp pump working If no pump ensure blue jumper plug inserted in IDU PCB plug CN_ FLOAT All split systems communication error between IDU amp ODU PCB check wiring 123 or 1234 wires at ODU MUST BE SAME COLOR as 123 or 1234 wires on IDU wiring is always polarity sensitive regardless of equipment type condensate pump float switches must break 1 on all inverters and 5 2 on 36V DC single units 3 on 36V DC Flex Multi units Unwire any auxiliary switches Inverters all units with a V in model Voltage on wires 2 amp 3 must float between approximately 0 65V DC DO NOT use a volt meter that automatically detects AC or DC voltage it will read exactly wrong and cause a mis diagnosis Wires 1 amp 2 carry 230V AC wires 2 amp 3 carry 65V DC Ensure wiring connection at IDU is 1 2 Ground 3 10 amp 13 SEER single IDU single ODU LS or LA model s with no V in model Voltage on 3 amp 4 wires must float between 0 12V DC 10 amp 13 SEER Flex Multi units LM model s with no V in model Voltage on 1 amp 2 wires must float between 0 12VDC All Units of all families Steady low or zero V DC is generally failed ODU PCB amp steady high voltage DC is generally failed IDU PCB Ensure Q between wires wires to ground or wires to shield Electrically check all fuses at IDU ODU Inverter Flex Multi LMUxxxHV Ensure IDU wires are not switched between IDUs 1A amp 1B on one terminal
7. 100 F amp 10 0009 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB wn PCB sees ODU suction line thermistor as open or shorted Must be 2 8000 at 38 C 100 F amp 10 0009 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB PCB sees ODU single speed compressor discharge pipe thermistor as open or shorted Must be 244 0000 at 20 C 68 F 24 4000 at 90 C 194 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB PCB sees ODU coil outlet liquid line thermistor as open or shorted 2 8000 at 38 C 100 F amp 10 0009 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB pD N 13 SEER Split Multi Split Outdoor unit discharge and air sensor both unplugged Verify AC voltage to ODU is 193 253V AC If OK check fuses if fuses OK replace outdoor main PCB 50 Error code not used 51 Flex Multi cannot exceed 130 indoor units relative to outdoor ODU communication error between inverter PCB and main outdoor unit PCB Check wiring amp fuses verify LEDs on both PCBs are lit If OK either inverter or main PCB defective Communication error Ensure that 3 communication wire is properly plugged into ODU PCB See error code 5 55 56 Error code not used 3 D 3 phase wiring issue Communication error between outdoor main PCB and inverter PCB Check wiring amp fuses ve
8. 866 543 8324 www LGcomfort ca LG LG Canada HVAC Technical Support Life s Good Ductless HVAC amp PTAC Error Codes 01 1 C1 and CHO1 are all the 1 code IDU Indoor Unit ODU Outdoor Unit PCB Printed Circuit Board LG Inverter units have a V in the model number such as LSU121HSV and use a 3 phase compressor Single phase unit feed is converted to 3 phase to power the compressor in ODU PCB Variable Hz controls compressor speed 10 amp 13 SEER single speed compressor systems never a V in model number show error codes at the indoor unit only Thermistor ohm charts including proper checkout procedure are at the end of this document The first digit in LG serial numbers is one digit year 9 2009 or 2 2012 Second amp third digits are two digit month 07 July Power i 10 digit 10 20 30 etc 1 digit 1 2 3 etc Cc WLAN CD 10 digit 10 20 30 etc a 1 2 3 etc LSN240HSV HSV2 and HSV3 LSNO91HSV3 LSN121HSV3 LSN181HSV3 indoor LSN305 LSN306 LSN307 LSN360 models in HV HV2 HV3 Inverter outdoor LSxxxHSV LAxxxHSV LSxxxHSV2 LAxxxHSV2 LSU091HSV3 LSU121HSV3 LAUOSOHYV LAU120HYV LSxxxHV LSxxxHV2 LSxxxHV3 LSU181HSV3 Red LED only shines thru hole in board LSU240HSV3 LSU307HV3 LSU360HV3 LMUxxxHV Multi blinks 10 20 30 etc followed by 1 2 3 etc outdoor LEDs flash red then green Gi E a a Inverter outdoor Single speed compressor units show errors indoors only Coolin CGHED 4
9. A12xHV LS9O2HPV and LS122HPV Inverter PCB sees IDU pipe OR air thermistor as open or shorted Pipe 2 800Q at 38 C 100 F amp 10 0009 at 10 C 50 F Air 5 6000 at 38 C 100 F amp 20 7000 at 10 C 50 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB 10 amp 13 SEER PCB sees IDU pipe OR air thermistor as open or shorted Pipe 2 800Q at 38 C 100 F amp 10 0009 at 10 C 50 F Air 5 6000 at 38 C 100 F amp 20 700Q at 10 C 50 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB PTAC PCB sees IDU air thermistor as open or shorted Must be 5 6000 at 38 C 100 F amp 20 7000 at 10 C 50 F Ohm thermistor in water measure the water temperature measure water temperature with perfect thermistor amp plug connection change PCB Inverter PCB sees IDU inlet pipe thermistor as open or shorted Must be 2 800 at 38 C 100 F amp 10 0009 at 10 C 50 F Ohm thermistor in water measure the water temperature with perfect thermistor amp plug connection change PCB 2 LAOSxHV LA12xHV LS9O2HPV LS122HPV Inverter PCB sees any ODU thermistor as open or shorted Pipe 2 8000 at 38 C 100 F amp 10 0009 at 10 C 50 F Air 5 6000 at 38 C 100 F amp 20 7000 at 10 C 50 F Discharge 244 0000 at 20 C 68 F 24 4000 at 90 C 194 F Ohm thermistor in water measure water temperature with perfect thermistor amp
10. d failure as well Verify 310V DC on motor wires separated by empty terminals on plug with motor plugged in OV DC failed PCB 310V DC likely failed motor Next step Unplug motor and manually spin the fan keep it spinning on same wires you just tested OV DC indicates motor failed and caused board failure 14 30V DC indicates a good motor PTAC same as inverter 10 amp 13 SEER 36V DC IDUs IDU fan failure if motor is not rotating verify 19 36V DC between DC common amp fan leg wire designation varies by 10 SEER 13 SEER single amp 13 SEER Flex Multi see page 2 of this document for wire functions Reactor or electronic noise filter Failure Copper coil around magnet in ODU replace this item Same error code as Cd Compressor Phase Amperage Error 15 16 17 18 19 20 Error code not used Low voltage or high voltage feeding unit verify proper 208 240V AC feeding unit Voltage feed must be 193 253V AC Inverter compressor seized not rotating or not proving rotation PCB converts single phase to 3 phase for compressor Verify 3 compressor 26 windings are all equal at 5 4Q verify Q to ground verify equal voltage on compressor 3 phase legs Verify no flow restrictions flow restriction in cool mode will pump down system Flow restriction in heat mode will dead head compressor Inverter compressor amperage over 100A for a split second verify proper 208 240V AC feeding unit ensure unit is not operating in high head 27
11. e speed compressor N N oe w N w 4 High pressure switch opened over 600 PSI Low pressure switch opened under 14 PSI 36 37 38 39 Error code not used Inverter PCB amperage sensing circuit failure Call LG Tech Support for assistance PCB sees inverter compressor discharge pipe thermistor as open or shorted Thermistor must be 244 000Q at 20 C 68 F 24 4000 at 90 C 194 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB 2 43 High pressure switch opened over 600 PSI All inverters PCB sees ODU air sensor as open or shorted Must be 5 6000 at 38 C 100 F amp 20 7009 at 10 C 50 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB PTAC PCB sees outdoor air thermistor as open or shorted If your unit is an LPxxxC check DIP switch settings If your unit is an LPxxxH check outside air thermistor must be 5 600Q at 38 C 100 F amp 20 7009 at 10 C 50 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB All inverters PCB sees ODU condensor coil middle if unit has middle sensor or exit pipe liquid line thermistor as open or shorted Must be 2 8000 at 38 C 100 F amp 10 0000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB 45 PTAC PCB sees outdoor coil pipe thermistor as open or shorted Must be 2 800Q at 38 C
12. hen indoor fan is off 20 36V DC when fan is running low through high speed 2 3 14 18V DC constantly 4 3 0 12V DC float Do not read any wire to ground it will not tell us what we need to know Generally speaking 0 or low constant voltage on 4 amp 3 will be a failed outdoor board and constant high voltage will be a failed indoor board 13 SEER Flex Multi LMO240_ and LMO360_ only units run on R 410a 1 2 3 4 wire functions and voltages 4 fan 3 indoor unit power 2 indoor unit common 1 communication All DC voltage is measured to the 2 common wire 4 2 OV DV when indoor fan is off 20 36V DC when fan is running low through high speed 3 2 14 18V DC constantly 1 2 0 12V DC float Do not read any wire to ground it will not tell us what we need to know Generally speaking 0 or low constant voltage on 1 amp 3 will be a failed outdoor board and constant high voltage will be a failed indoor board o Error code not used PCB sees IDU air thermistor as open or shorted Must be 5 6000 at 38 C 100 F amp 20 7000 at 10 C 50 F Ohm thermistor in water measure the water temperature with perfect thermistor amp plug connection change PCB PCB sees ODU discharge pipe thermistor as open or shorted Must be 244 0000 at 20 C 68 F 24 4000 at 90 C 194 F Ohm thermistor in water measure water temperature with perfect thermistor amp plug connection change PCB 13 SEER Flex Multi with dual single speed compressors EEPROM error
13. iquid thermistors called Tube on previous documents are used on all piping amp coils except the compressor discharge pipe whether on an indoor unit or an outdoor unit on ELL ALLL RRC ER CELE LR bke beled eel LL LL TT A wW oO sS S h N oO ite a N g S A o 0 a p85 EE 32 31 29 28 26 Oo x 23 22 A 208 20 193 1 86 166 er 1 54 148 124 0 63 T LG Air Thermistor Ohm Chart All air thermistors have black plastic tips whether for an indoor or outdoor unit Indoor air thermistors will be located on the right hand side of the indoor unit or in the return air flow Outdoor air thermistors will be located in open air on the rear of the outdoor unit coil Air thermistors have been labeled Ambient in previous documents 17 6 55 4 po 19 4f 52 3 O 20 B12 Ln E ee te 49 4 es 698 12 Ooo 5 azy 46e O 22 o nej 115 Oooo a 2a aad Oo 23 af 109 Ooo a 266 416 Oo 2a 752 104 EEE o p82 37a O 26 78s 95 E Oo a27 Boef 9a EE Oo 28 Beaj 87l Ooo a2 5e 316 Oo 29 aaa 83 Pp a araj 299 O sof eef 79 EEE Oo a ae 7e po ajy 269 Oo 32 Boef 7 2 ee 42eg a255 Oo y ay 6g es aae 242l Ooo oaa a2 6e Pp ej aeaf 229 Oo s os 6 Ooo o aea 21g O ej 8 61l Oo P5207 Ooo s7 oef 58 Oooo o oon sae 19 7 sef 1004 56 Ooo aj 536 18 7 Oo 102 2 53 P13 55a 178 eS ee EA Pp A572 169 Oooo as Onf 4a E SHORT 8 LG Discha
14. lict Flex Multi Different mode operation indoor units must be set either all to heat or all to cool LS902HPV LS122HPV LAOOxHV LA12xHV Compressor Over Amperage verify proper 208V or 240V AC feeding unit ensure unit is not operating in high head situation verify 1 4Q between all compressor terminals PTAC Thermistor error verify proper DIP switch settings 6 OFF 7 OFF heat pump 6 OFF 7 ON cooling electric heat If used verify wall mount thermostat properly wired for heat pump or cool only With cool only unit GH B and O terminals are not used IDU fan motor not rotating or proving rotation Verify fan motor plugged in correctly amp fan rotates freely This can be a failed motor failed board or motor could have failed and caused board failure as well LS902HPV LS122HPV LAOOxHV and LA12xHV Verify 310V DC on motor wires separated by empty terminals on plug with motor plugged in OV DC failed PCB 310V DC likely failed motor Next step Unplug motor and manually spin the fan keep it spinning on same wires you just tested OV DC indicates motor failed and caused board failure 14 30V DC indicates a good motor 10 amp 13 SEER if motor is not rotating verify 19 36V DC between DC common amp fan leg wire designation varies by 10 SEER 13 SEER single amp 13 SEER Flex Multi see previous page explaining 1 2 3 4 wire functions LS9O2HPV LS122HPV LAO9xHV LA12xHV ODU fan motor not rotating or proving rotation Verify fan mot
15. or plugged in correctly amp fan rotates freely This can be a failed motor failed board or motor could have failed and caused board failure as well Verify 310V DC on motor wires separated by empty terminals on plug with motor plugged in OV DC failed PCB 310V DC likely failed motor Next step Unplug motor and manually spin the fan keep it spinning on same wires you just tested OV DC indicates motor failed and caused board failure 14 30V DC indicates a good motor All other Inverter units V in model Indoor unit EEPROM error failed EEPROM thumbnail size IDU PCB or mismatched IDU ODU PTAC models except ending in B High pressure switch tripped If sleeve is too deep condensor air will recirculate in sleeve and trip high pressure switch With extended sleeves air splitters must be used to separate condensor intake and exhaust air PTAC models ending in B Failed EEPROM replace main PCB Inverter Flex Multi LMUxxxHV EEPROM error call LG Tech Support with model and serial number LS9O2HPV LS122HPV LAOSxHV and LA12xHV PCB sees ODU discharge pipe thermistor open shorted Must be 244 0000 at 20 C 68 F amp 24 4000 at 90 C 194 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB All other Inverters ODU fan motor not rotating or proving rotation Verify fan motor plugged in correctly amp fan rotates freely This can be a failed motor failed board or motor could have failed and caused boar
16. rge Pipe Thermistor Ohm Chart Discharge thermistor will only be located in the discharge pipe immediately off the compressor Only discharge thermistors always have a white braided insulation LG Canada HVAC Technical Support 866 543 8324 follow prompt for Language Tech Support then Heating amp Air Conditioning www LGcomfort ca
17. rify LEDs on both PCBs are lit If OK either inverter or main PCB defective 58 59 Error code not used EEPROM failure Replace PCB if the EEPROM is non removable Call LG Tech Support for assistance PCB sees Condenser coil over 65 C 149 F Code is sensed at ODU in cool mode and IDU in heat mode Verify coil filters amp blower wheel are clean and airflow OK Check system pressures for non condensibles Verify system is not running in high condensor coil temperature condition Verify 61 JALL thermistors on condensor coil IDU ODU depending on mode are accurate Can be caused by discrepancy among thermistors on same coil ODU coils 1 2 thermistors with metal tip IDU coils 1 3 thermistors with metal tip Must be 2 8000 at 38 C 100 F amp 10 000Q at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB Inverter ODU PCB heat sink 85 C 185 F Verify air flow across heat sink verify PCB tight to heat sink use thermal paste Thermistor 10 0000 at 25 C 77 F amp 20 7000 at 10 C 50 F Ohm thermistor in water with perfect thermistor amp plug connection change PCB 34 Ei 40 49 51 60 running in low condensor coil temperature condition Verify ALL thermistors on condensor coil IDU ODU depending on mode are accurate can be caused by discrepancy among thermistors on same coil ODU coils 1 2 thermistors IDU coils 1 3 thermistors 2 800Q at 38 C 100 F
18. situation verify 3 compressor windings are all equal at 1 4Q verify Q to ground check amperage check reactor connections and verify reactor resistance is less than 10 Inverter DC link voltage too low verify proper 208 240V AC feeding unit Voltage feed must be 193 253V AC Use appropriate service manual to verify if PCB has failed Inverter compressor high amperage verify proper 208 240V AC feeding unit ensure unit is not operating in high head pressure condition verify 3 Ne compressor windings are all equal at 1 40 verify Q to ground check amperage Inverter compressor 105 C 220 F in discharge pipe Verify proper refrigerant charge amp ensure unit is not operating in high head temperature situation Generally will be refrigerant undercharge sometimes inaccurate discharge pipe thermistor Thermistor 244 0000 at 20 C 68 F 24 4000 at 90 C 194 F Ohm thermistor in water ensure it plugs in properly LS302HPV LS305HV LS306HV amp LS307HV have 1 inverter amp 1 single speed compressor Single speed compressor 105 C 220 F in discharge pipe Verify proper refrigerant charge amp ensure unit is not operating in high head temperature situation Generally will be refrigerant undercharge sometimes inaccurate discharge pipe thermistor Thermistor 244 000Q at 20 C 68 F 24 4000 at 90 C 194 F Ohm thermistor in water ensure it plugs in properly LS302HPV LS305HV LS306HV amp LS307HV have 1 inverter amp 1 singl
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