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10 TROUBLESHOOTING

1. Error code history 3 Oldest Alternate display of abnormal unit number and code When no error history 0 and are displayed by turns Code display Error thermistor display o bea there is no error thermistor is displayed 3 Outdoor pipe temperature Liquid TH3 6 Outdoor pipe temperature 2 phase TH6 T Outdoor outside temperature TH7 8 Outdoor heatsink TH8 Code display Operation frequency on error occurring 0 255 0 255 When it is 100Hz or more hundreds digit tens digit and ones digit are displayed by turns Example When 125Hz 0 5 secs 0 5 secs 2 secs 1 gt 25 Fan step on error occurring 0 10 81 SW2 setting Display detail The black square IW indicates a switch position Explanation for display LEV A opening pulse on error occurring 0 480 0 480 When it is 100 pulse or more hundreds digit tens digit and ones digit are displayed by turns Example When 130 pulse 0 5 secs 0 5 secs 2 secs 1 30 gt 4 Indoor room temperature TH1 on error occurring 46 102 46 102 8 39 C Indoor pipe temperature Liquid TH2 on error occurring 38 190 38 190 39 88 C When the temperature is O F or less and temperature are displayed by turns
2. Gray Black Gray Red Gray Yellow Gray Orange 46 30 Open or short Solenoid valve coil lt Bypass valve gt SV For A24 36 only Measure the resistance between the terminals with a tester At the ambient temperature 20 C 68 F Abnormal Open or short Normal 1450 150Q 55 Check method of DC fan motor fan motor outdoor controller circuit board Notes High voltage is applied to the connecter CNF 1 2 for the fan motor Pay attention to the service Do not pull out the connector CNF1 2 for the motor with the power supply on It causes trouble of the outdoor controller circuit board and fan motor Self check Symptom The outdoor fan cannot turn around Fuse check Check the fuse F5 on outdoor controller board Did the fuse blow V No Wiring contact check Contact of fan motor connector CNF1 2 Replace outdoor controller board C B T ese C and fan motor MF 1 2 VY Is there contact failure gt 3 Yes gt V No Power supply check Remove the connector CNF1 2 Measure the voltage in the outdoor controller circuit board TEST POINT Voc between 1 and 4 of the fan connector Voc DC250 330V TEST POINT Vcc between 5 and 4 of the fan connector Vec DC15V VY Is the voltage normal gt gt Yes gt C Replace the fan motor V No V Yes
3. Input current of outdoor unit 0 500 When it is 100 or more hundreds digit tens digit and ones digit are displayed by turns Targeted operation frequency 0 255 0 255 When it is 100Hz or more hundreds digit tens digit and ones digit are displayed by turns DC bus voltage 180 370 180 370 When it is 100V or more hundreds digit tens digit and ones digit are displayed by turns 80 SW2 setting Display detail The black square li indicates a switch position Explanation for display Capacity save 0 100 When air conditioner is connected to M NET and capacity save mode is demanded 0 100 is displayed When there is no setting of capacity save 100 is displayed 0 100 When the capacity is 10096 hundreds digit tens digit and ones digit are displayed by turns Example When 100 0 5 secs O 5secs 2 secs 1 gt 00 gt Error postponement code history 2 of outdoor unit Postponement code display Blinking During postponement Lighting Cancellation of postponement 00 is displayed in case of no postponement Code display Error postponement code history 3 of outdoor unit Postponement code display Blinking During postponement Lighting Cancellation of postponement 00 is displayed in case of no postponement Code display
4. The airflow direction does not change Up down vane left right louver 1 Check if the vane is set to a fixed position Check if the vane motor connector is removed 2 Check if the air conditioner has a function for switching the air direction 3 If the air conditioner doesn t have that function NOT AVAILABLE will be displayed on the remote controller when AIR DIRECTION or LOUVER button is pressed The air conditioner starts operating even though any buttons on the remote controller are not pressed Check if you set ON OFF timer The air conditioner starts operating at the time designated if ON timer has been set before Q Check if any operations are ordered by distant control system or the central remote controller While CENTRALLY CONTROLLED INDICATOR is displayed on the remote controller the air conditioner is under the control of external directive There might be a case that CENTRALLY CONTROLLED INDICATOR will not be displayed Check if power is recovered from power failure black out The units will automatically start operating when power is recovered after power failure black out occurs This function is called auto recovery feature from power The air conditioner stops even though any buttons on the remote controller are not pressed D Check if you set ON OFF timer The air conditioner stops operating at the time designated if OFF timer has b
5. Action by th itch ti Switch Function ON yee swite SEES Effective timing Type of Switch No function Power failure automatic recovery X2 Auto recovery No auto recovery When power supply ON No function Model select Following SW5 6 reference SW7 1 SWT 2 Demand swich ON Setting of demand OFF OFF 0 Operation stop coniro ON OFF 50 is OFF ON 75 Max Hz setting cooling Max Hz cooling x 0 8 Normal Max Hz setting heating Max Hz heating x 0 8 Normal No function Dip switch Defrost setting For high humidity Normal No function Function switch Valid Normal No function MODEL MODEL PUZ A18NHA4 on PUY A12NHA4 i ON PUZ A24ANHM OFF PUY A18NHA4 Model select posa ae ON ol OFF PUY A24NHA4 ON ON ON d PUYASONHM OFF PUZ A36NHA4 OFF E m am S ON ON PUZ M2NHM OFF N OFF PUY A36NHA4 OFF m 7 m 7 m 7 m 7 m ON The black square PUY
6. PLEASE WAIT the remote controller is disabled operation mode are displayed alternately Wait until PLEASE WAIT disappears before using remote controller Displays the remaining Turn on the main power supply Mcd PREIS for about 2 minutes after power test run time Press TEST button twice The TEST RUN appears on the screen Cooling mode Check if cool air blows and water is drained Press amp OPERATION SWITCH Heating mode Check if warm air blows It takes a little while until warm air blows aA MITSUBISHI ELECTRIC button TEST EUM U AIT 4 Press Q AIR DIRECTION Jbutton Check for correct motion of auto vanes Go CAP 5 Check the outdoor unit fan for The outdoor unit features automatic capacity control to 84 Tuer Gem um Gum correct running provide optimum fan speeds Therefore the fan keeps CY C i running at a low speed to meet the current outside air condition unless it exceeds its available maximum power Then in actuality the fan may stop or run in the reverse direction depending on the outside air but this does not TEST button mean malfunction 6 Press the ON OFF button to reset the test run in progress Pipe liquid temperature 7 Register the contact number n case of test run
7. Refer to the following tables for details on the check codes Output pattern A code in the following table i e n 5 for P5 Repeated Beepersounds Beep Beep Beep Beep Beep T OPERATION 4st 2nd 3d nth INDICATOR lamp blink Of on On On ow on On pattern Self che check us E 5 sec 0 5 sec 0 5 sec 0 5 sec 0 5 v Approx 2 5 sec 0 5 sec 0 5 sec starts V v J ra sigra Number of blinks beeps in pattern indicates the check Number of blinks beeps in pattern indicates the check code in the following table Output pattern B code in the following table i e n 5 for U2 Beeper sounds Beep Beep Beep Beep Beep Beep Beep OPERATION a esl 24 ae BIEN L isl 275 Repeated INDICATOR P un 5 lamp blink off On O On On On off On On On pattern Self check Approx 2 5 sec Approx 3 sec 0 5 sec 0 5 sec 0 5 sec 0 5 sec Approx 2 5 sec Approx 3 sec 0 5sec 0 5 sec starts s A Start signal received Number of blinks beeps in pattern indicates the check Number of blinks beeps in pattern indicates the check code in the following table Output pattern A Errors detected by indoor unit Wireless remote controller Beeper sounds OPERATION Wired remote controller Symptom Remark INDICATOR lamp blinks Check code Number of times 1 P1 Intake sensor error 2 P2 Pipe TH2 sensor error P9 Pipe TH5
8. 10 TROUBLESHOOTING 10 1 TROUBLESHOOTING Error code display by self diagnosis and actions to be taken for service summary Present and past error codes are logged and displayed on the wired remote controller and control board of outdoor unit Actions to be taken for service which depends on whether or not the trouble is reoccurring at service are summarized in the table below Check the contents below before investigating details Unit conditions at service Error code Actions to be taken for service Summary Judge what is wrong and take a corrective action according Displayed to 10 4 Self diagnosis action table The trouble is reoccurring Conduct trouble shooting and ascertain the cause of the Not displayed trouble according to 10 5 Troubleshooting by inferior phenomena Consider the temporary defects such as the work of protection devices in the refrigerant circuit including compressor poor connection of wiring noise and etc Re check the symptom and check the installation environment refrigerant amount weather when the trouble occurred matters related to wiring and etc Reset error code logs and restart the unit after finishing service GThere is no abnormality concerning of parts such as electrical component controller board remote controller and etc The trouble is not reoccurring Re check the abnormal symptom Conduct trouble shooting and ascertain the c
9. 2 or more outdoor units have refrigerant address 0 In case of group control Noise has entered into power supply or indoor outdoor unit connecting wire Check disconnection or looseness or polarity of indoor outdoor unit connecting wire of indoor and outdoor units Check diameter and length of indoor outdoor unit connecting wire Total wiring length 80m 262ft including wiring connecting each indoor unit and between indoor and outdoor unit Also check if the connection order of flat cable is S1 S2 S3 Check the number of indoor units that are connected to one outdoor unit If EA is detected 5 6 Turn the power off once and on again to check Replace outdoor controller circuit board indoor controller board or indoor power board if abnormality occurs again Check if refrigerant addresses SW1 3 to SW1 6 on outdoor controller circuit board are overlapping in case of group control system Check transmission path and remove the cause The descriptions above D G are for EA Eb and EC lt Abnormalities detected while unit is operating gt Error Code Abnormal point and detection method Case Judgment and action High pressure High pressure switch 63H operated Abnormal if high pressure switch 63H oper ated during compressor operation 4 15 MPa 602PSIG 63H High pressure switch Short cycle of indoor unit Clogged filter of indoor unit Decreas
10. Correct the wiring U V W phase to compressor Refer to 10 9 Outdoor power circuit board Check compressor referring to 10 6 Replace outdoor power circuit board Outdoor fan motor Abnormal if the rotational frequency of fan motor is not detected during DC fan motor operation Fan motor rotational frequency is abnormal if 100 rpm or below detected continuously for 15 seconds at 20 C 68 F or more outside air temperature 50 rpm or below or 1500 rpm or more detected continuously for 1 minute D Failure in the operation of the DC fan motor Failure in the outdoor circuit controller board 38 D Check or replace the DC fan motor Check the voltage of the outdoor circuit controller board during operation 9 Replace the outdoor circuit controller board when the failure is still indicated even after performing the action above Error Code Abnormal point and detection method Case Judgment and action Outdoor fan motor Abnormal if the rotational frequency of fan motor is not detected during DC fan motor operation Fan motor rotational frequency is abnor mal if 100 rpm or below detected continuously for 15 seconds at 20 C 68 F or more outside air temperature 50 rpm or below or 1500 rpm or more detected continuously for 1 minute O Failure in the operation of the DC fan motor Failure in the outdoor circuit controller board Check or repl
11. Noise has entered into indoor outdoor unit connecting wire Check disconnection or looseness of indoor outdoor unit connecting wire of indoor or out door units Turn the power off and on again to check Replace indoor controller board or outdoor controller circuit board if abnormal ity is displayed again Indoor outdoor unit communication error Transmitting error Outdoor unit 1 Abnormal if 0 receiving is detected 30 times continuously though outdoor con troller circuit board has transmitted 1 2 Abnormal if outdoor controller circuit board could not find blank of transmission path for 3 minutes Indoor outdoor unit connecting wire has contact failure Defective communication circuit of outdoor controller circuit board Noise has entered power supply Noise has entered indoor out door unit connecting wire Check disconnection or looseness of indoor outdoor unit connecting wire Turn the power off and on again to check Replace outdoor controller circuit board if abnormality is displayed again Non defined error code This code is displayed when non defined error code is received Noise has entered transmission wire of remote controller Noise has entered indoor out door unit connecting wire Outdoor unit is not a power inverter models Model name of remote control ler is PAR S25A C Turn the power off and on again to check Replace indoor
12. How to wire lt Low level sound priority mode circuit gt Insulate this point securely as Adaptor for external this is not used signal input Outdoor unit Purchased locally PAC SC36NA controller board Se SS eS SS eS eS 1 l Red 3 Relay supply swt l CNDM SW1 Switch 4 o X Relay Contact spec DC1mA Max 10 m 33ft including local wiring 1 Make the circuit as shown above with Adaptor for external signal input PAC SC36NA 2 Turn SW1 to on for Low level sound priority mode Turn SW1 to off to release Low level sound priority mode and normal operation b Demand control Local wiring Demand control is available by external input In this mode power consumption is decreased within the range of usual 0 100 How to wire Basically the wiring is the same as a Connect an SW1 which is procured at field to the between Orange and Red 1 and 3 of the Adaptor for external signal input PAC SC36NA and insulate the tip of the brown lead wire It is possible to set it to the following power consumption compared with ratings by setting the SW7 1 2 SW7 1 SW7 2 Oen ion OFF OFF 0 Operation stop ON OFF 50 OFF ON 75 73 lt Display function of inspection for outdoor unit gt The blinking patterns of both LED1 green and LED2 red indicate the types of abnormality when it occurs Types of abnormality
13. In the case of group control for which remote controller controls multiple refrigerant systems the refrigerant address and error code of the unit that first experienced trouble i e the unit that transmitted the error code will be displayed 4 MITSUBISHI ELECTRIC a o ON OFF CA o m Hay EN oy Foal FILTER m orn A ES CHECK Test QVO CAD ol v Re A gt CLEAR G To clear the error code press the ON OFF button es i V Alternating Display nn T LILI Error code 2 or 4 digits When using remote local controller combined operation cancel the error code after turning off remote operation During central control by a MELANS controller cancel the error code by pressing the D ON OFF button 10 3 2 Self Diagnosis During Maintenance or Service Since each unit has a function that stores error codes the latest check code can be recalled even if it is cancelled by the remote controller or power is shut off Check the error code history for each unit using the remote controller Set the unit number or refrigerant address you want to diagnose Switch to self diagnosis mode Press the TEMP buttons Cv and CA to select the desired number Press the CHECK button twice within 3 seconds The display content or address The n
14. U9 UH Abnormality such as overvoltage or voltage shortage and d abnormal synchronous signal to main circuit Current sensor error 12 13 14 Others Other errors 1 If the beeper does not sound again after the initial 2 beeps to confirm the self check start signal was received and the OPERATION INDICATOR lamp does not come on there are no error records 2 If the beeper sounds 3 times continuously beep beep beep 0 4 0 4 0 4 sec after the initial 2 beeps to confirm the self check start signal was received the specified refrigerant address is incorrect 34 10 4 SELF DIAGNOSIS ACTION TABLE lt Abnormalities detected when the power is turned on gt Note 1 Refer to indoor unit section for code P and code E Error Code Abnormal point and detection method Case Judgment and action No voltage is supplied to terminal block TB1 of outdoor unit a Power supply breaker is turned off b Contact failure or disconnec tion of power supply terminal C Open phase L1 or L2 phase Electric power is not charged to power supply terminal of out door power circuit board 8 Contact failure of power supply terminal b Open phase on the outdoor power circuit board A12 A24N Disconnection of connector R or S A30 A42N Disconnection of connector TABT or TABS G Electric power is not supplied to outdoor controller circuit board 8 Disconnection of connector CNDC Disconnection of reactor DC
15. sensor error 3 E6 E7 Indoor outdoor unit communication error 4 P4 Drain sensor error Float switch connector open 5 P5 Drain pump error As far indoor PA Forced compressor stop due to water leakage abnormality 6 P6 Freezing Overheating protection operation unit reter S 7 EE Communication error between indoor and outdoor units indago units 8 P8 Pipe temperature error service manual 9 E4 E5 Remote controller signal receiving error 10 11 x 12 Fb Indoor unit control system error memory error etc EO E3 Remote controller transmission error a E1 E2 Remote controller control board error Output pattern B Errors detected by unit other than indoor unit outdoor unit etc Wireless remote controller Wired remote controller Beeper sounds OPERATION INDICATOR lamp blinks Check code Symptom Remang Number of times 4 E9 Indoor outdoor unit communication error Transmitting error Outdoor unit 2 UP Compressor overcurrent interruption 3 U3 U4 Open short of outdoor unit thermistors 4 UF Compressor overcurrent interruption When compressor locked 5 U2 Abnormal high discharging temperature insufficient refrigerant Abnormal high pressure 63H operated Overheating ja pons ee 6 U1 Ud protection operation se EU Cl 7 U5 Abnormal temperature of heatsink Md M 8 U8 Outdoor unit fan protection stop 9 U6 Compressor overcurrent interruption Abnormal of power module
16. the OFF timer will be activated and the test run will automatically stop after 2 hours The room temperature display section shows the pipe temperature of indoor units during the test run Check that all the indoor units are running properly in case of simultaneous twin operation Malfunctions may not be dis played regardless of incorrect wiring x1 After turning on the power supply the system will go into startup mode PLEASE WAIT will blink on the display section of the room temperature and lamp green of the remote controller will blink As to INDOOR BOARD LED LED1 will be lit LED2 will either be lit in case the address is O or turned off in case the address is not 0 LEDS will blink As to OUTDOOR BOARD LED LED1 green and LED2 red will be lit After the startup mode of the system finishes LED2 red will be turned off In case OUTDOOR BOARD LED is digital display O and will be displayed alternately every second f one of the above operations does not function correctly the causes written below should be considered Find causes from the symptoms The below symptoms are under test run mode startup in the table means the display status of 1 written above Symptoms in test run mode i Cause Remote Controller Display OU dicates cita display Y Remote controller displays PLEASE After startup is displayed only After power is turned on PLEASE WAIT is displayed for 2 WAIT and cannot be operated g
17. 10 hours 0 5 secs 0 5secs 12 gt 45 gt 2 secs 10 hours Compressor operating current 0 50 0 50 Omit the figures after the decimal fractions Compressor operating frequency 0 255 0 255 When it is 100Hz or more hundreds digit tens digit and ones digit are displayed by turns Example When 125Hz 0 5 secs 0 5secs J1 gt 25 gt 2 secs LEV A opening pulse 0 480 0 480 When it is 100 pulse or more hundreds digit tens digit and ones digit are displayed by turns Example When 150 pulse 0 5 secs 0 5secs J gt 50 gt 2 secs Error postponement code history 1 of outdoor unit Postponement code display Blinking During postponement Lighting Cancellation of postponement 00 is displayed in case of no postponement Code display Operation mode on error occurring T1 Operation mode of when operation stops due to error is displayed by setting SW2 as below SW2 ON Code display The black square IW indicates a switch position SW2 setting Display detail Explanation for display Pipe temperature Liquid TH3 on error 40 194 40 90 C occurring When the coil thermistor detects 0 F or below 40 194 and temperature are displayed by turns Example When
18. 15 F 0 5 secs O 5secs 2 secs gt 15 gt Compressor shell temperature TH32 or 37 327 3 164 C discharge temperature TH4 on error When the temperature is 100 F or more the occurring hundreds digit tens digit and ones digit are 37 327 displayed by turns Example When 130 F 0 5 secs O 5secs 2 secs 1 gt 30 Er F Compressor operating current on error occurring 0 50 Error code history 1 latest When no error history Alternate display of abnormal unit 0 and are displayed by turns number and code Code display Error code history 2 When no error history Alternate display of error unit number 0 and are displayed by turns and code Code display Thermostat ON time 0 999 0 999 When it is 100 minutes or more the hundreds digit tens digit and ones digit are displayed by turns Example When 245 minutes Minute 0 5 secs O 5secs 2 secs 2 gt 45 7 Test run elapsed time 0 120 0 120 When it is 100 minutes or more the hundreds digit tens digit and ones digit are displayed by turns Example When 105 minutes Minute 0 5 secs 0 5secs 2 secs 1 gt 05 t 78 The black square WW indicates a switch
19. 17 F or below 102 C 216 F or above Temperature of heatsink Abnormal if heatsink thermistor TH8 detects temperature indicated below A12 18 42N 84C 183 F A24 30 36N 81C 177 F The outdoor fan motor is locked Failure of outdoor fan motor Air flow path is clogged Rise of ambient temperature Defective thermistor Defective input circuit of outdoor power circuit board Failure of outdoor fan drive circuit Check outdoor fan Check airflow path for cooling Check if there is something which causes temperature rise around outdoor unit Upper limit of ambient temperature is 46 C 114 F Turn off power and on again to check if U5 is displayed within 30 minutes If U4 is displayed instead of U5 follow the action to be taken for U4 Check resistance value of thermistor TH8 or temperature by microprocessor Thermistor TH8 Refer to 10 6 SW2 on A Control Service Tool Refer to 10 10 Replace outdoor power circuit board Replace outdoor controller circuit board Power module Check abnormality by driving power module in case overcurrent is detected UF or UP error condition Outdoor stop valve is closed Decrease of power supply voltage Looseness disconnection or converse of compressor wiring connection Defective compressor Defective outdoor power circuit board D Open stop valve Check facility of power supply
20. 38A the input current or 10 seconds continuous 34A or more Disconnection of compressor wiring Defective circuit of current sensor on outdoor power circuit board G Decrease of power supply voltage D Correct the wiring U V W phase to compressor Refer to 10 9 Outdoor power circuit board Replace outdoor power circuit board Check the facility of power supply Low pressure 63L operated Abnormal if 63L is operated under 0 03MPa during compressor operation 63L Low pressure switch A42N only Stop valve of outdoor unit is closed during operation Disconnection or loose connec tion of connector 63L on outdoor controller board Disconnection or loose connection of 63L Defective outdoor controller board amp Leakage or shortage of refrigerant amp Malfunction of linear expansion valve 39 Check stop valve Turn the power off and on again to check if F3 is displayed on restarting If F3 is displayed follow the F3 processing direction Correct to proper amount of refrigerant Check linear expansion valve Refer to 10 6 Error Code Abnormal point and detection method Case Judgment and action Compressor overcurrent interruption Abnormal if overcurrent DC bus or com pressor is detected after compressor starts operating for 30 seconds Stop valve of outdoor unit is closed Decrease of power supply volt age Loo
21. F 17 5kQ 50C 122F 70kQ 100 C 212 F 13 0kQ 60 C 140 F 48kQ 110C 230F 9 8kQ 57 50 40 el 30 o o C S E 9 20 10 20 10 0 10 20 30 40 50 TC 4 14 32 50 68 86 104122 F Temperature 200 150 o o c c 1 100 o o X 50 0 T a 25 50 75 100110 125 C 77 122 167 212 230 257 F Temperature 500 400 Q 300 8 8 E 200 100 25 50 75 100 120 C 77 122 167 212 248 F Temperature Linear expansion valve 1 Operation summary of the linear expansion valve A12 18 Linear expansion valve opens closes through stepping motor after receiving the pulse signal from the outdoor controller board Valve position can be changed in proportion to the number of pulse signal Connection between the outdoor controller board and the linear expansion valve Outdoor controller board 2 Linear expansion valve operation Valve position capacity 5 1a Pulse number Extra tightening about 32 pulse 00 pulse Opening a valve Il the way Opening a valve 8 57565554 535251 8 Closing a valve 1525354555 6257581 The output pulse shifts in above order When linear expansion valve operation stops all output phases become OFF When the switch is turned on 700 pulse closing valve
22. M2NHM OFF m indicates a switch position eUN C aim ENG CUN orN orNor N o o3 oca OJA I NIOJ AJOJN gt x2 Power failure automatic recovery can be set by either remote controller or this DIP SW If one of them is set to ON Auto recovery activates Please set Auto recovery basically by remote controller because not all units have DIP SW Please refer to the indoor unit installation manual x3 SW7 1 2 are used for demand control SW7 1 2 are effective only at the demand control Refer to next page Special function b x4 Please do not use SW7 3 6 usually Trouble might be caused by the usage condition 2 Function of connector Action by open short operation mM Types Connector Function Effective timing Short Open Connector CN31 Emergency operation Start Normal When power supply ON 12 Special function a Low level sound priority mode Local wiring Unit enters into Low level sound priority mode by external signal input setting Inputting external signals to the outdoor unit decreases the outdoor unit operation sound 3 to 4 dB lower than that of usual Adding a commercial timer or on off switch contactor setting to the CNDM connector which is optional contactor for demand input located on the outdoor controller board enables to control compressor operation frequency The performance depends on the load of conditioned outdoor temperature
23. OK Check the operation of fan gt END Replace outdoor controller board NG C Replace outdoor controller board D Y OK Check the operation gt END y NG C Replace the fan motor D 56 10 7 HOW TO CHECK THE COMPONENTS lt Thermistor feature chart gt Low temperature thermistors Thermistor Outdoor pipe TH3 Thermistor Outdoor 2 phase pipe TH6 Thermistor Outdoor TH7 Thermistor RO 15kQ 3 B constant 3480 2 1 1 t C Rt 15exp 3480 27341 273 1 _ i T F RT 15exp 3480 273 T 32 1 8 273 OC 32 F 15kQ 30 C 86 F 4 3kQ 10 C 50 F 9 6kQ 40 C 104 F 3 0kQ 20 C 68 F 6 3kQ 25 C 77 F 5 2kQ Medium temperature thermistor Thermistor Heatsink TH8 Thermistor R50 17kQ 2 B constant 4170 3 1 1 t C Rt 17exp 4170 27334 323 1 1 T F RT 17exp 4170 973 T 32 1 8 323 oC 32 F 180kQ 25C 77 F 50kQ 50 C 122 F 17kQ 70 C 158 F 8kQ 90 C 194 F AkQ High temperature thermistor Thermistor Discharge TH4 for A42 gt Thermistor Shell TH32 for A12 18 24 30 36 Thermistor R120 7 465kQ 2 B constant 4057 2 1 1 t C Rt 7 465exp 4057 57334 393 1 1 T CF Rr 7 465exp 4057 273 1 32 1 8 393 20 C 68 F 250kQ 70 C 158 F 34kQ 30 C 86 F 160kQ 80 C 176 F 24kQ 40 C 104 F 104kQ 90 C 194
24. P1 _ Abnormality of room temperature thermistor U1 UP Malfunction outdoor unit P2 Abnormality of pipe temperature thermistor Liquid F3 F9 Malfunction outdoor unit P4 Abnormality of drain sensor Float switch connector open EO E5 Remote controller transmitting error P5 Drain overflow protection is working E6 EF Indoor outdoor unit communication error P6 Freezing overheating protection is working No error history P8 Abnormality of pipe temperature FFFF No applied unit Abnormality of pipe temperature thermistor Cond Eva Forced compressor stop due to water leakage abnormality Abnormality of indoor controller board See the table below for details of the LED display LED 1 2 3 on the indoor controller board LED1 microprocessor power supply Lights when power is supplied Lights when power is supplied for wired remote controller LED2 remote controller The indoor unit should be connected to the outdoor unit with address 0 setting LED3 indoor outdoor communication Flashes when indoor and outdoor unit are communicating 29 COOL ON OFF 4M MITSUBISHI ELECTRIC 9 9 9 Pal a S i TEMP Got BO MODE FAN AUTOSTOP 3 O O VANE AUTOSTART S CHECK LOUVER ee green TEST RUN SET o RESET CLOCK o o Test run for wireless remote controller Measure an impedance b
25. as there is no problem with the remote The remote controller must be replaced with a new one I l I l I l SELF CHECK l SELF CHECK I I MEM I l l controller 1 l Where the remote controller is not defective but cannot be operated Error display 2 E3 6833 or 6832 blinks Transmission is not possible Error display 3 ERC and the number of data errors are displayed Data error has occurred l SELFCHECK 7 l SELF CHECK Ex due lt lt lt lt lt 4 Lu LM R L e E RL e l There might be noise or interference on the transmission path or the indoor unit The number of data errors is the difference between the number of bits sent from or other remote controllers are defective Check the transmission path and other the remote controller and the number actually transmitted through the transmis controllers sion path If such a problem is occurring the transmitted data is affected by noise etc Check the transmission path te When the number of data errors is 02 Transmission data from remote controller njnirhi n Transmission data on transmission path Aucun To cancel remote controller diagnosis Press the CHECK button for 5 seconds or more Remote controller diagnosis will be cancelled PLEASE WAIT and operation lamp will blink After approximately 30 seconds the state in effect before the diagnosis will be restored 32 10 3 4 Malfunction
26. can be indicated in details by connecting an optional part A Control Service Tool PAC SK52ST to connector CNM on outdoor controller board Display 1 Normal condition A Control Service Tool Indication of the display Outdoor controller board LED1 Green LED2 Red Lighted Lighted Lighted Not lighted Lighted Not lighted Lighted Lighted Unit condition Error code Alternately blinking display Operation mode When the power is turned on When unit stops When compressor is warming up When unit operates C5 H7 etc 2 Abnormal condition Indication Outdoor controller board LED1 Green LED2 Red 2 blinking Connector 63L is open Connector 63H is open 2 connectors are open Detailed reference page P 35 Contents Inspection method Check if connector 63L or 63H on the outdoor controller board is not disconnected GCheck continuity of pressure switch 63L or 63H by tester 1 blinking Miswiring of indoor outdoor unit conne cting wire excessive number of indoor units 4 units or more Check if indoor outdoor connecting wire is connected correctly G Check if 4 or more indoor units are connected to outdoor unit Miswiring of indoor outdoor unit co nnecting wire converse wiring or di sconnection Check if noise entered into indoor outdoor connecting wire or power supply Startup time over Re check error by turning
27. in order to define the valve position The pulse signal is being sent for about 20 seconds 2 Linear expansion valve operation When the valve moves smoothly there is no sound or vibration occurring from the linear expansion valve however when the pulse number moves from 6 to amp or when the valve is locked Pd sound can be heard than normal situation No sound is heard when the pulse number moves from to in case coil is burn out or motor is locked by open phase Sound can be detected by placing the ear against the screw driv er handle while putting the screw driver to the linear expansion valve Valve position capacity 500 pulse Opening a valve all the way Pulse number Extra tightening about 32 pulse 59 3 How to attach and detach the coil of linear expansion valve A12 18 lt Composition gt Linear expansion valve is separable into the main body and the coil as shown in the diagram below Coil Main body lt How to detach the coil gt Hold the lower part of the main body shown as A firmly so that the main body does not move and detach the coil by pulling it upward Be sure to detach the coil holding main body firmly Otherwise pipes can bend due to pressure Lead wire Stopper A lt How to attach the coil gt een Hold the lower part of the main body shown as A firmly so that oon 7 the main body does not move and attach the coil by insertin
28. off power and on again 2 blinking Indoor outdoor unit communication error signal receiving error is detected by in door unit Check if indoor outdoor connecting wire is connected correctly GCheck if noise entered into indoor outdoor connecting wire or Indoor outdoor unit communication error transmitting error is detected by indoor unit power supply Check if noise entered into indoor outdoor controller board Indoor outdoor unit communication error signal receiving error is detected by outdoor unit Re check error by turning off power and on again Indoor outdoor unit communication error transmitting error is detected by outdoor unit 3 blinking Remote controller signal receiving error is detected by remote controller Check if connecting wire of indoor unit or remote controller is connected correctly Remote controller transmitting error is detected by remote controller Check if noise entered into transmission wire of remote controller Remote controller signal receiving error is detected by indoor unit GRe check error by turning off power and on again Remote controller transmitting error is detected by indoor unit 4 blinking Error code is not defined Check if remote controller is MA remote controller PAR 21MAA Check if noise entered into transmission wire of remote controller Check if noise entered into indoor outdoor connecting wire
29. or less Indoor 2 temperature are displayed by turns 38 190 Indoor room temperature TH1 46 102 8 39 C 46 102 79 SW2 setting Display detail The black square IW indicates a switch position Explanation for display ON Indoor setting temperature 62 86 62 86 17 30 C Outdoor pipe temperature 2 phase pipe TH6 38 190 38 190 39 88 C When the temperature is 0 F or less and temperature are displayed by turns Outdoor outside temperature TH7 38 190 38 190 39 88 C When the temperature is O F or less and temperature are displayed by turns Outdoor heatsink temperature TH8 40 327 40 327 40 164 C When the temperature is O F or less and temperature are displayed by turns When the thermistor detects 100 F or more hundreds digit tens digit and ones digit are displayed by turns Discharge superheat SHd 0 327 Cooling TH4 or TH32 TH6 Heating TH4 or TH32 TH5 0 327 0 182degC When the temperature is 100degF or more hun dreds digit tens digit and ones digit are displayed by turns Sub cool SC 0 234 Cooling TH6 TH3 Heating TH5 TH2 0 234 0 130degC When the temperature is 100degF or more hun dreds digit tens digit and ones digit are displayed by turns
30. power circuit board TABP2 L1 L2 Connect to the DCL Reactor N1 Non connect Upper side Lower side N2 Non connect Connect to the outdoor power circuit board TABP1 Connect to the outdoor power circuit board CNAF 1 GND lo Connect to the outdoor power ae COR dona Connect to the outdoor power circuit board TABN1 4 5 Not used circuit board TABN2 6 1 Control signal Tester check points of Active filter module Error condition Normal value reference Symptom when the unit is in trouble and lo open less than 10 D The unit does not operate can not be switched ON short 100kQ 1MQ_ The breaker operates and L2 open x1 The unit does not operate can not be switched ON U9 Abnormal stop X2 short 100kQ 1MQ_ The breaker operates PRIME open x1 The unit does not operate can not be switched ON U9 Abnormal stop X2 short 100kQ 1MQ_ The breaker operates Pene open x1 The unit does not operate can not be switched ON U9 Abnormal stop X2 short 100kQ 1MQ_ The breaker operates L2 and lo open x1 The unit does not operate can not be switched ON U9 Abnormal stop X2 1 The symptom when the unit is in open error condition is described to determine open error by tester check 2 SW2 setting m Code 20 display 1 6 70 10 10 FUNCTION OF SWITCHES CONNECTORS AND JUMPERS 1 Func
31. same refrig erant system with LOSSNAY is turned off or within 2 min utes of restart abnormality is detected Contact failure of transmis sion wire of indoor unit of LOSSNAY Disconnection of transmission connector CN2M of indoor unit Defective transmitting receiv ing circuit of indoor unit or LOSSNAY 7 lf displayed address or attribute is non existent The unit of former address does not exist as address Switch has changed while the unit was energized Abnormality is detected when indoor unit transmit ted because the address of FRESH MASTER and LOSSNAY are changed after sequential operation of FRESH MASTER and LOSSNAY by remote controller 44 Same as mentioned in A7 of the previous page Error Code Abnormal point and detection method Case Judgment and action continuously M NET NO RESPONSE Abnormal if a message was transmitted and there were reply ACK that message was received but response command does not return Transmitting side detects abnormality every 30 seconds 6 times Note The address and attribute displayed at remote controller indicate the con troller that did not reply ACK Transmitting condition is repeated fault because of noise and the like Extension of transmission wire voltage and signal is caused by over range transmission wire Maximum distance 656ft Remote controller line 12m 39ft Ex
32. signal will be sent till it goes to point in order to define the valve position The pulse signal is being sent for about 20 seconds When the valve moves smoothly there is no sound or vibration occurring from the linear expansion valve however when the pulse number moves from to amp or when the valve is locked sound can be heard than normal situation No sound is heard when the pulse number moves from 6 to in case coil is burn out or motor is locked by open phase Sound can be detected by placing the ear against the screw driv er handle while putting the screw driver to the linear expansion valve 58 Linear expansion valve A24 30 36 42 1 Operation summary of the linear expansion valve Linear expansion valve opens closes through stepping motor after receiving the pulse signal from the outdoor controller board Valve position can be changed in proportion to the number of pulse signal Connection between the outdoor controller board and the linear expansion valve Outdoor controller board iw Gray d Drive circuit 4 Orange 3 a Opening avalve 8 gt 7 gt 6 gt 5 gt 4 gt 3 gt 2 gt 1 gt 8 Closing a valve 1 gt 2 gt 3 gt 4 gt 5 gt 6 gt 7 gt 8 gt 1 The output pulse shifts in above order e When linear expansion valve operation stops all output phase become OFF When the switch is turned on 700 pulse closing valve signal will be sent till it goes to point
33. to the earth CNAC1 CNAC2 208 230V AC Connect to the outdoor control ler circuit board CNAC CN5 Primary current Connect to the outdoor power circuit board CN5 LO NO Voltage of 208 230V AC is output Connect to the ACL CN52C 52C relay signal Connect to the outdoor controller circuit board CN52C 65 Outdoor noise filter circuit board PUZ A24NHA4 PUZ A24NHA4 BS PUY A24NHA4 PUY A24NHA4 BS El E2 Connect to the earth CNAC1 CNAC2 x SY is A od to 208 230V AC 7 Pe t the earth Connect to the TE outdoor control ler circuit board h CNAC o e CN5 Primary current Connect to the outdoor power circuit board CN5 CN52C E 52C relay signal Connect to the outdoor controller circuit board CN52C LO NO Voltage of 208 230V AC is output Connect ACL 66 Outdoor noise filter circuit board PUZ A30 36 42NHA4 PUZ A30 36 42NHA4 BS PUY A30 36 42NHA4 PUY A30 36 42NHA4 BS CN52C 52C driving signal Connect to the outdoor controller circuit board CN52C RS1 LO NO Voltage of 208 230V AC is output Connect to the outdoor power circuit board TABS TABT CNAC1 CNAC2 208 230V AC Connect to the outdoor control ler circuit board CNAC E2 Connect to the earth CN5 Primary current EI Connect to the outdoor power Connect to circuit board CN5 the earth LI NI Voltage of 208 230V AC is input Connect to the termi
34. 0 Check CNAF wiring Defective ACTM P B 20 Display examples for multiple errors Overvoltage 01 Undervoltage 02 03 Undervoltage 02 Power sync signal error 08 0A L phase open error 04 PFC error 10 14 Code display The black square IW indicates a switch position SW2 setting Display detail Explanation for display Controlling status of compressor The following code will be a help to know the operating frequency operating status of unit The tens digit Compressor operating frequency control Primary current control Secondary current control The ones digit In this digit the total number of activated control is displayed Compressor operating frequency control Preventive control for excessive temperature rise of discharge temperature Preventive control for excessive temperature rise of condensing temperature Frosting preventing control Preventive control for excessive temperature rise of heatsink Example The following controls are activated Primary current control Preventive control for excessive temper ature rise of condensing temperature Preventive control for excessive temper ature rise of heatsink Code display 84
35. AS nn ZEE nn ENT LILI o LILI 9 Cancel self diagnosis Self diagnosis can be cancelled by the following 2 methods Press the CHECK button twice within 3 seconds gt Self diagnosis will be cancelled and the screen will return to the previous state in effect before the start of self diagnosis Press the ON OFF button gt Self diagnosis will be cancelled and the indoor unit will stop 10 3 3 Remote Controller Diagnosis If the air conditioner cannot be operated from the remote controller diagnose the remote controller as explained below O First check that the power on indicator is lit If the correct voltage DC12 V is not supplied to the remote controller the SELF CHECK indicator will not light If this occurs check the remote controller s wiring and the indoor unit L Power on indicator Switch to the remote controller self diagnosis mode Press the FILTER button to start self diagnosis Pressthe CHECK button for 5 seconds or more The display content will change as shown below SELF CHECK RL e Remote controller self diagnosis result When the remote controller is functioning correctly When the remote controller malfunctions Error display 1 NG blinks The remote controller s transmitting receiv ing circuit is defective r SERS r shee 7 IL EL 9m Check for other possible causes
36. Check the voltage of the unit after removing the indoor power board CN2S Defective indoor Replace the indoor controller board controller board YES DC 12V to DC 16V Miswiring breaking Check if there is miswiring or poor connection of or breaking of wire indoor outdoor connecting wire NO Defective indoor Replace the indoor power board power board 48 Symptoms Nothing is displayed on the remote controller Diagnosis flow LED display of the indoor controller board LED1 LED2 LEDS or 9 Inspection method and troubleshooting Check the voltage between S1 and S2 on the terminal block TB4 of the indoor unit NO AC 187V to AC 253V Check the status Not lighting of the indoor controller board LED3 display Check the looseness or disconnection of the indoor outdoor connecting wire Blinking Are there looseness or disconnection of the indoor Qutdoor connecting wire Check the refrigerant address of the outdoor unit SW1 3 to 1 6 Is the refrigeran address 0 YES Check the LED display of the outdoor unit after turning on the main power again Not displayed Is anything displayed Displayed Is EA or Eb displayed Is E8 displayed Can the unit be restarted Check the voltage between S2 and S3 on the
37. ER LOSSNAY or remote con troller is not connected to terminal block for central control TB7 of outdoor unit Check if transmission wire of indoor unit FRESH MASTER or LOSSNAY is not con nected to terminal block for transmission wire of outdoor unit Check if terminal block for transmission wire TB3 and terminal block for central control TB7 are not connected Check transmission waveform or noise on transmission wire Error Code Abnormal point and detection method Case Judgment and action Communication error with communica tion processor Defective communication between unit processor and transmission processor Note The address and attribute display at remote controller indicate the con troller that detected abnormality Data of transmission proces Sor or unit processor is not transmitted normally because of accidental trouble such as noise or lightning surge Address forwarding from unit processor is not transmitted normally because of defective transmission processor hard ware Turn off the power supply of outdoor unit and indoor unit and FRESH MASTER or LOSSNAY at the same time for 2 minutes or more and turn the power on again System returns to normal if abnormality was accidental malfunc tion If the same abnormality generates again abnormality generated controller may be defec tive NO ACK signal 1 Transmitting side controller detects abnormal if a massage w
38. Example When 15 F 0 5 secs 0 5 secs 2 secs gt 15 gt k Indoor pipe temperature Cond Eva TH5 on error occurring 38 190 38 190 39 88 C When the temperature is O F or less and temperature are displayed by turns Example When 15 F 0 5 secs 0 5 secs 2 secs gt 15 gt t J Outdoor pipe temperature 2 phase TH6 on error occurring 38 190 38 190 39 88 C When the temperature is O F or less and temperature are displayed by turns Example When 15 F 0 5 secs 0 5 secs 2 secs 15 gt t Outdoor outside temperature TH7 on error occurring 38 190 38 190 39 88 C When the temperature is O F or less and temperature are displayed by turns Example When 15 F 0 5 secs 0 5 secs 2 secs gt 15 gt t Outdoor heatsink temperature TH8 on error occurring 40 327 40 327 40 164 C When the temperature is O F or less and temperature are displayed by turns When the temperature is 100 F or more hundreds digit tens digit and ones digit are displayed by turns 82 SW2 setting Display detail The black square IW indicates a switch position Explanation for display Discharge s
39. Hd SC will be different from the list above Example When liquid temperature thermistor TH3 has an open or short circuit Thermistor COOL HEAT TH3 45 C 113 F 5 41 F Ta Tb TH6 Regard normal figure as effective data Tc Td Regard normal figure as effective data 5 41 F 50 C 122 F 5 41 F Discharge superheat SHd Cooling TH4 TH6 Tc Ta Heating TH4 TH5 Td 50 C or 122 F Degree of subcooling SC Cooling TH6 TH3 Ta 45C or 113 F Heating TH5 TH2 50 C 45 C 5 degC or 122 F 113 F 9 degF 45 C 113 F 63 10 9 TEST POINT DIAGRAM CAUTION TEST POINTO is high voltage Outdoor controller circuit board PUZ A18 24 30 36 42NHA4 PUZ A18 24 30 36 42NHA4 BS PUY A12 18 24 30 36 42NHA4 PUY A12 18 24 30 36 42NHA4 BS SW7 SW1 CN51 Demand control setting Forced defrost detect history record reset refrigerant address External signal output Swe Po eed operating Model select Abnormal signal SWA Test operation a M to SWP Input of low level Pump down Dun UR mode o SW5 y za Input of external con Function switch Pano Lid tact point SW8 CN52C Wiring replace Connect to the noise CNM filter circuit board Connect to A control CN52C service tool CNMNT CN4 Connect to Transmission to out M NET adapter CN5 ea ai
40. L or ACL Disconnection of outdoor noise filter circuit board or parts fail ure in outdoor noise filter circuit board As for A30 A42N type it is especially needed to check the resistance RS1 on the noise filter circuit board Defective outdoor power circuit board Defective outdoor controller circuit board Check following items 8 Power supply breaker b Connection of power supply terminal block TB1 c Connection of power supply terminal block TB1 Check following items 8 Connection of power supply terminal block TB1 b Connection of terminal on outdoor power circuit board A12 A24N Disconnection of connector R or S Refer to 10 9 A30 A42N Disconnection of connector TABT or TABS Refer to 10 9 Check connection of the connector CNDC on the outdoor controller circuit board Check connection of the connector LD1 and LD2 for A12 A24N and CNDC for A30 A36N on the outdoor power circuit board Refer to 10 9 Check connection of reactor DCL or ACL A12 A24N Check connection of LO and NO on the outdoor noise filter circuit board Check connection of R and S on the outdoor power circuit board A30 A42N Check connection of L1 and L2 on the active filter module ACTM Refer to 10 9 a Check connection of outdoor noise filter circuit board b Replace outdoor noise filter circuit board Refer to 10 9 Replace outdoor power circuit board Replace controller bo
41. Re check error by turning off power and on again 5 blinking Serial communication error Communication between outdoor controller board and outdoor power board Communication between outdoor controller board and M NET P C board Check if connector CN4 on outdoor controller board and outdoor power board is not disconnected GCheck if there is poor connection of connector on outdoor controller board CNMNT and CNVMNT Communication error of M NET System X1 Error code displayed on remote controller X2 Refer to service manual for indoor unit Check M NET communication signal 74 Indication Outdoor controller board LED Green LED2 Red Contents Inspection method 3 blinking 1 blinking Abnormality of shell thermistor TH32 and discharging temperature TH4 Check if stop valves are open Check if connectors TH4 TH32 LEV A on outdoor controller board are not disconnected GCheck if unit is filled with specified amount of refrigerant Measure resistance values among terminals on indoor valve and outdoor linear expansion valve using a tester 2 blinking Abnormal high pressure High pressure switch 63H worked Check if indoor outdoor units have a short cycle on their air ducts Check if connector 63H on outdoor controller board is not disconnected GCheck if heat exchanger and filter is not dirty Measure resistance values among termi
42. ace the DC fan motor Check the voltage of the outdoor circuit con troller board during operation Replace the outdoor circuit controller board when the failure is still indicated even after performing the action above Overvoltage or voltage shortage and synchronous signal to main circuit Abnormal if any of followings are detected during compressor operation Decrease of DC bus voltage to 310V Instantaneous decrease of DC bus volt age to 200V Increase of DC bus voltage to A12 18 24N 420V A30 36 42N 400V Decrease of input current of outdoor unit to 0 5A only if operation frequency is more than or equal to 40Hz or compres Sor current is more than or equal to 5A Abnormal power synchronous zero cross signal PFC error overcurrent when the current peak of input current increase A12 18 24N 47A peak Decrease of power supply volt age Disconnection of compressor wiring Disconnection or loose con nection of CN52C Defective PFC module of out door power board A12 18 24N only Defective ACT module A30 36 42N only Defective ACT module drive circuit of outdoor power circuit board A30 36 42N only Disconnection or loose con nection of CNAF A30 36 42N only Defective 52C drive circuit of outdoor noise filter circuit board 9 Disconnection or loose connection of CN5 on the outdoor power circuit board Disconnection or loose connectio
43. ard When items above are checked but the units cannot be repaired 63L connector open Abnormal if 63L connector circuit is open for 3 minutes continuously after power supply 63L Low pressure switch lt A42N only Disconnection or contact failure of 63L connector on outdoor controller circuit board Disconnection or contact failure of 63L G 63L is operating due to refriger ant leakage or defective parts Defective outdoor controller circuit board Check connection of 63L connector on outdoor controller circuit board Refer to 10 9 Check the 63L side of connecting wire Check refrigerant pressure Charge additional refrigerant Check continuity by tester Replace the parts if the parts are defective Replace outdoor controller circuit board Error Code Abnormal point and detection method Case Judgment and action 63H connector open Abnormal if 63H connector circuit is open for 3 minutes continuously after power supply 63H High pressure switch Disconnection or contact failure of 63H connector on outdoor controller circuit board Disconnection or contact failure of 63H 63H is operating due to defective parts Defective outdoor controller circuit board Check connection of 63H connector on outdoor controller circuit board Refer to 10 9 Check the 63H side of connecting wire G Check continuity by tester Replace the parts if the part
44. ard controller and indoor controller board are mismatched and the unit does not start operat ing Operation display is indicated on wireless remote controller 5 When operating by the wireless No operation for 2 minutes at most after the power DNormal operation remote controller beep sound is supply ON heard however unit does not start Hand held remote controller operation is prohibited Normal operation operating Remote controlling adaptor is connected to CN32 on the indoor controller board Hand held remote controller operation is prohibited by centralised controller etc since it is connected to MELANS Refer to factor of phenomena No 2 on previous page amp Check the details of phenomena No 2 on previous page Remote controller display works CRefrigerant shortage If refrigerant leaks discharging tempera normally and the unit performs cool ture rises and LEV opening increases ing operation however the capacity Inspect leakage by checking the tempera cannot be fully obtained The air ture and opening does not cool well Check pipe connections for gas leakage Filter clogging Open intake grille and check the filter Clean the filter by removing dirt or dust on it GHeat exchanger clogging If the filter is clogged indoor pipe tem perature rises and discharging pressure increases Check if heat exchanger is clogged by inspecting discharging pres sure Clean the heat exchange
45. as transmitted but there is no reply ACK that a mes sage was received Transmitting side detects abnormality every 30 seconds 6 times continuously Note The address and attribute displayed at remote controller is indicate the controller that did not reply ACK Common factor that has no rela tion with abnormality source Q The unit of former address does not exist as address Switch has changed while the unit was energized Extinction of transmission wire voltage and signal is caused by over range transmission wire Maximum distance 200m 656ft Remote controller line 12m 39ft Extinction of transmission wire voltage and signal is caused by type unmatched transmission wire With shield wire CVVS CPEVS With normal wire no shield VCTF VCTFK CVV CVS VVR VVF VCT Diameter 1 25mm2 AWG16 or more Extinction of transmission wire voltage and signal is caused by over numbered units Accidental malfunction of abnormality detected controller noise lightning surge Defective of abnormality gen erated controller If displayed address or attribute is out door unit Indoor unit detects abnormality when indoor unit transmitted to outdoor unit and there was no reply ACK Contact failure of transmission wire of outdoor unit or indoor unit Disconnection of transmission connector CN2M of outdoor unit Defective transmitting receiving circuit of outdoor unit or indoo
46. ause of the trouble according to 10 5 Troubleshooting by inferior phenomena Not logged Continue to operate unit for the time being if the cause is not ascertained There is no abnormality concerning of parts such as electrical component controller board remote controller and etc 10 2 CHECK POINT UNDER TEST RUN 1 Before test run After installation of indoor and outdoor units piping work and electric wiring work re check that there is no refrigerant leak age loosened connections and incorrect polarity Measure impedance between the ground and the power supply terminal block L1 L2 on the outdoor unit by 500V Megger and check that it is 1 0MQ or over Do not use 500V Megger to indoor outdoor connecting wire terminal block S1 S2 S3 and remote controller terminal block 1 2 This may cause malfunction Make sure that test run switch SW4 is set to OFF before turning on power supply Turn on power supply 12 hours before test run in order to protect compressor For specific models which requires higher ceiling settings or auto recovery feature from power failure make proper changes of settings referring to the description of 12 FUNCTION SETTING Make sure to read operation manual before test run Especially items to secure safety 28 i While the temperature display on the remot TEST RUN and the currently selected Operating procedures ne NEBL BE AIK ines lids controller is
47. body coil may be detached from the main body and that can cause defective operation of lin ear expansion valve To prevent piping stress be sure to attach the coil holding the main body of linear expansion valve firmly Otherwise pipe may break 61 10 8 EMERGENCY OPERATION 1 When the error codes shown below are displayed on outdoor unit or microprocessor for wired remote controller or indoor unit has a failure but no other problems are found emergency operation will be available by setting the emergency opera tion switch SWE to ON and short circuiting the connector CN31 on outdoor controller board When following abnormalities occur emergency operation will be available Error code Inspected content U4 Open short of pipe thermistor TH3 TH6 E8 Indoor outdoor unit communication error Signal receiving error Outdoor unit E9 Indoor outdoor unit communication error Transmitting error Indoor unit Communication error other than outdoor unit Ed Communicaiton error between outdoor controller board and M NET board Serial communication error 2 Check the following items and cautions for emergency operation O Make sure that there is no abnormality in outdoor unit other than the above abnormalities Emergency operation will not be available when error codes other than the above are indicated For emergency operation it is necessary to set the emergency operation switch SWE on indoor co
48. ce Postponement code is displayed while error is being postponed ON ON ON o 1 2 3 4 5 6 7 8 A 3 When the display blinks Inspection code is displayed when compressor stops due to the work of protection devices Display Contents to be inspected During operation U1 Abnormal high pressure 63H operated U2 Abnormal high discharging temperature shortage of refrigerant U3 Open short circuit of discharge thermistor TH4 and shell thermistor TH32 U4 Open short of outdoor unit thermistors TH3 TH6 TH7 and TH8 U5 Abnormal temperature of heatsink UG Abnormality of power module U8 Abnormality in outdoor fan motor UF Compressor overcurrent interruption When Comp locked Inspection unit UH Current sensor error UL Abnormal low pressure 63L operated Outdoor unit UP Compressor overcurrent interruption Indoor unit 1 Abnormality of indoor units Indoor unit 2 Communication error of M NET system Contents to be inspected When power is turned on 63L connector red is open 63H connector yellow is open 2 connectors 63H 63L are open Indoor outdoor communication error Signal receiving error Outdoor unit Indoor outdoor communication error Transmitting error Outdoor unit Miswiring of indoor outdoor unit connecting wire excessive number of indoor units 4 units or more Miswiring of i
49. controller board or outdoor controller circuit board if abnormality is displayed again Replace outdoor unit with power inverter type outdoor unit Replace remote controller with MA remote controller Serial communication error 1 Abnormal if serial communication between outdoor controller circuit board and outdoor power circuit board is defective 2 Abnormal if communication between outdoor controller circuit board and M NET board is not available Breaking of wire or contact failure of connector CN2 between the outdoor controller circuit board and the outdoor power circuit board Breaking of wire or contact failure of connector CN4 between the outdoor controller circuit board and the outdoor power circuit board Defective communication circuit of outdoor power circuit board Defective communication circuit of outdoor controller circuit board for outdoor power circuit board Breaking of wire or contact failure of connector between outdoor controller circuit board and M NET board Contact failure of M NET board power supply line Noise has entered into M NET transmission wire 41 Check connection of each connector CN2 and CN4 between the outdoor controller circuit board and the outdoor power circuit board Replace outdoor power circuit board Replace outdoor controller circuit board Check disconnection looseness or breaking of connection wire between
50. diagnosis method by wireless remote controller lt In case of trouble during operation gt When a malfunction occurs to air conditioner both indoor unit and outdoor unit will stop and operation lamp blinks to inform unusual stop lt Malfunction diagnosis method at maintenance service gt Procedure 1 Press the CHECK button twice CHECK lights and refrigerant a MITSUBISHI ELECTRIC Bac t address 00 blinks display e Check that the remote controller s CHECK display has stopped before continuing display 2 Press the temperature A e Select the refrigerant address of the emper buttons indoor unit for the self diagnosis ON OFF TEMP Note Set refrigerant address using the OW outdoor unit s DIP switch SW1 sled For more information see the outdoor unit installation manual gro FAN f AUTO STOP pO s 0O T MODE VANE AUTOSTAR 3 Point the remote controller at the If an air conditioner error occurs the amp osi POUR sensor on the indoor unit and indoor unit s sensor emits an intermit CHECK LOUVER h press the HOUR button tent buzzer sound the operation lamp cHECK riean ELI m blinks and the error code is output button It takes 3 seconds at most for error ser reser LOOK e code to appear 4 Point the remote controller at the The check mode is cancelled sensor on the indoor unit and press the ON OFF button 33
51. e operation the blower s ON OFF is controlled by with the controller during DRY the microprocessor to prevent overcooling and to blower operation No air comes out ensure efficient dehumidification The fan speed sometimes during DRY cannot be set by the remote controller during DRY operation operation The fan speed does not match This is not a malfunction The up down vane will be the setting of the remote 1 When the HEAT operation starts to prevent the automatically set to controller in HEAT operation unit from blowing cold air the fan speed is horizontal blow in these gradually increased from 0 to the set speed cases listed up on the left in proportion to the temperature rise of the 1 3 After a while the discharged air up down vane will be 2 When the room temperature reaches the set automatically moved temperature and the outdoor unit stops according to the setting of the unit starts the LOW AIR operation the remote controller 3 During the HEAT operation the DEFROST operation is performed to defrost the outdoor unit During the DEFROST operation the fan is stopped to prevent cold air coming out of the indoor unit Phone Calls From Customers How to Respond Note Something is wrong with the Air blows out for a while after HEAT operation is stopped G This is not a malfunction The blower is operating just for cooling down the heated up air conditioner This will be done
52. ed airflow caused by dirt of indoor fan Dirt of indoor heat exchanger amp Locked indoor fan motor amp Malfunction of indoor fan motor Defective operation of stop valve Not full open Clogged or broken pipe Locked outdoor fan motor Malfunction of outdoor fan motor Short cycle of outdoor unit Dirt of outdoor heat exchanger 3 Decreased airflow caused by defective inspection of outside temperature thermistor It detects lower temperature than actual temperature Disconnection or contact failure of connector 63H on outdoor controller board 5 Disconnection or contact failure of 63H connection 6 Defective outdoor controller board 2 Defective action of linear expansion valve 48 Malfunction of fan driving circuit Check indoor unit and repair the defect Check if stop valve is fully open Check piping and repair the defect Check outdoor unit and repair the defect Check the inspected temperature of outside temperature thermistor on LED display SW2 on A Control Service Tool Refer to 10 10 5 06 Turn the power off and check F5 is displayed when the power is on again When F5 is displayed refer to Judgment and action for F5 Check linear expansion valve Refer to 10 6 7 Replace outdoor controller board U2 TH4 1102 TH32 1132 High discharging temperature High comp shell temperature 1 Abnormal if discharge temperature thermisto
53. een set before 9 Check if any operations are ordered by distant control system or the central remote controller While CENTRALLY CONTROLLED INDICATOR is displayed on the remote controller the air conditioner is under the control of external directive There might be a case that CENTRALLY CONTROLLED INDICATOR will not be displayed Phone Calls From Customers How to Respond A white mist is expelled from the indoor unit This is not a malfunction This may occur when the operation gets started in the room of high humidity Water or moisture is expelled from the outdoor unt Cooling when pipes or piping joints are cooled they get sweated and water drips down Heating water drips down from the heat exchanger Use optional parts Drain Socket and Drain pan if these water needs to be collected and drained out for once The display of wireless remote controller gets dim or does not come on The indoor unit does not receive a signal from remote controller at a long distance Batteries are being exhausted Replace them and press the reset button of remote controller 54 10 6 HOW TO CHECK THE PARTS PUZ A18 24 30 36 42NHA4 PUY A12 18 24 30 36 42NHA4 Parts name PUZ A18 24 30 36 42NHA4 BS PUY A12 18 24 30 36 42NHA4 BS Check points Thermistor TH3 lt Outdoor pipe gt Thermistor TH4 lt Discharge gt Thermistor TH6 lt Outdoor 2 phase pipe gt Thermis
54. efective transmitting receiving circuit of indoor controller board Noise has entered into indoor outdoor unit connecting wire Defective fan motor Defective rush current resistor x Check LED display on outdoor controller circuit board Connect A Control service tool PAC SG50ST Refer to EA EC item if LED displays EA AC Check disconnecting or looseness of indoor outdoor unit connecting wire of indoor unit or outdoor unit Check all the units in case of twin indoor unit system Turn the power off and on again to check If abnormality generates again replace indoor controller board or outdoor controller circuit board Turn the power off and detach fan motor from con nector CNF1 2 Then turn the power on again If abnormality is not displayed replace fan motor If abnormality is displayed replace outdoor controller circuit board amp Check RS1 on outdoor noise filter board with tester If open is detected replace the board Other indoor controller board may have defect in case of twin indoor unit system Indoor outdoor unit communication error Signal receiving error Outdoor unit 1 Abnormal if outdoor controller circuit board could not receive anything normally for 3 minutes Contact failure of indoor out door unit connecting wire Defective communication circuit of outdoor controller circuit board Defective communication circuit of indoor controller board
55. erant Charge additional refrigerant Check if stop valve is fully open Turn the power off and check if U3 is dis played when the power is on again When U3 is displayed refer to Judgement and action for U3 amp Check linear expansion valve Refer to 10 6 7 Error Code Abnormal point and detection method Case Judgment and action U3 TH4 5104 TH32 5132 Open short circuit of discharge temperature thermistor TH4 comp shell thermistor TH32 Abnormal if open 3 C 37 F or less or short 217 C 422 F or more is detected during compressor operation Detection is inoperative for 10 minutes of compressor starting process and for 10 minutes after and during defrosting Disconnection or contact failure of connector TH4 TH32 on the outdoor controller circuit board Defective thermistor Defective outdoor controller circuit board D Check connection of connector TH4 TH32 on the outdoor controller circuit board Check breaking of the lead wire for thermistor TH4 TH32 Refer to 10 9 Check resistance value of thermistor TH4 TH32 or temperature by microprocessor Thermistor TH4 TH32 Refer to 10 6 SW2 on A Control Service Tool Refer to 10 10 Replace outdoor controller board U4 TH3 5105 TH6 5107 TH7 5106 TH8 5110 Open short of outdoor unit thermistors TH3 TH6 TH7 and TH8 Abnormal if open or short is detected during compressor opera
56. ero cross signal 0 5V DC 18V DC 16V DC 16V DC P QN w i CNAF Cu Connect to ACTM Tee f E d i T 4 CN3 ddl Thermistor TH8 Lt lt Heatsink gt inv EL CN5 aah B Detection of primary current ja gh f Connect to the IE 8A outdoor noise filter circuit board CN5 CN4 Connect to the outdoor controller circuit board CN4 TABP2 SC P2 Connect to ACTM TABN TABP Connect to the Connect to the smoothing capacitor smoothing capacitor CRo CB A42N only A42N only Brief check of POWER MODULE x Usually they are in a state of being short circuited if they are broken Measure the resistance in the following points connectors etc If they are short circuited it means that they are broken 1 Check of diode bridge TABP1 TABS TABN1 TABS TABP1 TABT TABN1 TABT 2 Check of DIP IPM P U P V P W N U N V N W TABU V W Connect to the compressor MC Voltage among phases 10V 180V AC CNDC 280 380V DC Connect to the outdoor controller circuit board DIP IPM EI 69 sBnureTa i r B TABN2 Connect to ACTM Connect to the outdoor noise fil ter circuit board Voltage among phases 208 230V AC IT TABP1 Connect to 52C TABN1 Connect to ACTM Active filter module PUZ A30 36 42NHA4 PUZ A30 36 42NHA4 BS PUY A30 36 42NHA4 PUY A30 36 42NHA4 BS P Connect to the outdoor
57. etween the power supply terminal block on the outdoor unit and ground with a 500V Megger and check that it is equal to or greater than 1 0MQ D Turn on the main power to the unit Press the button twice continuously Start this operation from the turned off status of remote controller display 3 and current operation mode are displayed Press the ox button to activate coo mode then check whether cool air is blown out from the unit Press the 9 sox button to activate xx mode then check whether warm air is blown out from the unit Press the 4 button and check whether strong air is blown out from the unit Press the button and check whether the auto vane operates properly Press the ON OFF button to stop the test run Note Point the remote controller towards the indoor unit receiver while following steps to It is not possible to run in FAN DRY or AUTO mode 30 10 3 HOW TO PROCEED SELF DIAGNOSIS 10 3 1 When a Problem Occurs During Operation Ifa problem occurs in the air conditioner the indoor and outdoor units will stop and the problem is shown in the remote controller display CHECK and the refrigerant address are displayed on the temperature display and the error code and unit number are displayed alternately as shown below If the outdoor unit is malfunctioning the unit number will be 00 B
58. g indoor controller board in group control indoor con troller board of address 0 may be abnormal Remote controller control board Abnormal if data cannot be normally read from the nonvolatile memory of the remote controller control board Error code E1 Abnormal if the clock function of remote controller cannot be normally operated Error code E2 Defective remote controller Replace remote controller Remote controller transmission error E3 signal receiving error E5 D Abnormal if remote controller could not find blank of transmission path for 6 sec onds and could not transmit Error code E3 Remote controller receives transmitted data at the same time compares the data and when detecting it judges different data to be abnormal 30 continuous times Error code E3 D Abnormal if indoor controller board could not find blank of transmission path Error code E5 Indoor controller board receives trans mitted data at the same time compares the data and when detecting it judges different data to be abnormal 30 continuous times Error code E5 2 remote controller are set as main In case of 2 remote con trollers Remote controller is connected with 2 indoor units or more Repetition of refrigerant address Defective transmitting receiving circuit of remote controller Defective transmitting receiving circuit of indoor controller board No
59. g it i downward into the main body Then securely attach the coil stop per to pipe B At this time be careful that stress is not added to bl l lead wire and main body is not wound by lead wire If the stop per is not firmly attached to pipe B coil may be detached from the main body and that can cause defective operation of linear expansion valve To prevent piping stress be sure to attach the coil holding the main body of linear expansion valve firmly Otherwise pipe may break Be sure to attach the stopper to pipe B 60 4 How to attach and detach the coil of linear expansion valve A24 30 36 42 lt Composition gt Linear expansion valve is separable into the main body and the coil as shown in the diagram below Stopper Main body Coil d Lead wire How to detach the coil Hold the lower part of the main body shown as A firmly so that the main body does not move and detach the coil by pulling it upward Be sure to detach the coil holding main body firmly Otherwise pipes can bend due to pressure How to attach the coil Hold the lower part of the main body shown as A firmly so that the main body does not move and attach the coil by inserting it downward into the main body Then securely attach the coil stop per to main body At this time be careful that stress is not added to lead wire and main body is not wound by lead wire If the stopper is not firmly attached to main
60. heck the status __Lighting of the LED2 Blinking Check the status of the LED2 after disconnecting the remote controller wire from the terminal block TB5 of the indoor unit Check the status Lighting of the LED2 Blinking Defective remote controller Breaking or poor contact of the remote controller wire The remote controller wire short circuits Defective indoor controller board Replace the remote controller Check if there is breaking or poor contact of the remote controller wire Check the voltage of the terminal block TB5 connecting the remote controller wire If itis not between DC 10V and DC16V the indoor controller board must be defective Check if the remote controller wire is short circuited Replace the indoor controller board Before repair Frequent calling from customers Phone Calls From Customers How to Respond Unit does not operate at all D The operating display of remote controller does not come on Check if power is supplied to air conditioner Nothing appears on the display unless power is supplied Unit cannot be restarted for a while after it s stopped Wait around 3 minutes to restart unit The air conditioner is in a state of being protected by the microprocessor s directive Once the compressor is stopped the unit cannot be restarted for 3 minutes This control is also applied when the u
61. ircuit of transmission processor G Transmission data is changed by the noise on transmission If the works of transmission wire is done with the power on turn off the power supply of outdoor unit and indoor unit and FRESH MASTER or LOSSNAY at the same time for 2 minutes or more and turn the power on again Check transmission waveform or noise on transmission wire BUS BUSY 1 Overtime error by collision damage Abnormal if transmitting signal is not possible for 8 10 minutes continuously because of collision of transmission 2 Data could not reach transmission wire for 8 10 minutes continuously because of noise or etc Note The address and attribute displayed at remote controller indicate the con troller that detected abnormality Transmission processor could not transmit signal because short cycle voltage of noise and the like have entered into transmis sion wire continuously Transmission quantity has increased and transmission is not possible because there was wiring mistake of terminal block for transmission wire TB3 and terminal block for central control TB7 in outdoor unit Transmission are mixed with others and occupation rate on transmission wire rose because of defective repeater a function to connector or disconnect trans mission of control and central control system of outdoor unit then abnormality is detected Check if transmission wire of indoor unit FRESH MAST
62. is displayed on the remote controller Inspection method and Diagnosis flow troubleshooting Check the voltage between S1 and S2 on the terminal block TB4 of the indoor unit NO AC 187V to AC 253V Check the voltage among L1 and L2 on the terminal block TB1 of the outdoor power circuit board AC 187V to AC 253V Troubles concerning Check the power wiring power supply to the outdoor unit Check the breaker Check the voltage between S1 and S2 on the terminal block TB1 of the outdoor unit which is used to connect the indoor unit and the outdoor unit AC 187V to AC 253V NO Sa Bad wiring of the Check the wiring of the outdoor controller outdoor unit board Check if the wiring is bad YES The fuses on the Check if the fuses are blown Check the voltage of indoor outdoor The fuses on the outdoor controller board CN2D controller circuit controller circuit board will board are blown be blown when the indoor outdoor connecting wire short circuits Bad wiring of the Check if miswiring breaking outdoor controller or poor contact is causing this DC 12V to DC 16V board problem Indoor outdoor The fuses on the connecting wire is polarized outdoor 3 core type Connect the controller circuit indoor unit and the outdoor board are blown unit by wiring each pair of 1 S2 and S3 on the both side of indoor outdoor terminal blocks
63. ise has entered into trans mission wire of remote control ler 40 Set a remote controller to main and the other to sub Remote controller is connected with only one indoor unit G The address changes to a separate setting Diagnose remote controller a When RC OK is displayed remote con trollers have no problem Turn the power off and on again to check When becoming abnormal again replace indoor controller board b When RC NG is displayed replace remote controller c When RC E3 or ERC 00 66 is displayed noise may be causing abnormality Error Code Abnormal point and detection method Judgment and action Indoor outdoor unit communication error Signal receiving error Abnormal if indoor controller board could not receive any signal normally for 6 minutes after turning the power on Abnormal if indoor controller board could not receive any signal normally for 3 minutes G Consider the unit as abnormal under the following condition When 2 or more indoor units are connected to an out door unit indoor controller board could not receive a signal for 3 minutes from outdoor controller circuit board a signal which allows outdoor controller circuit board to transmit signals Contact failure short circuit or miswiring converse wiring of indoor outdoor unit connecting wire Defective transmitting receiv ing circuit of outdoor controller circuit board D
64. l oar CNVMNT SV2 Connect to M NET adapter CND nes aN LEV A Linear expansion valve 2184 63L Low pressure switch Piura TH4 Thermistor lt Discharge gt A42 only gt TH3 GAZ Thermistor Connect to the outdoor lt Outdoor pipe gt power circuit board CN2 TH7 6 Reception from Thermistor power circuit board lt Outdoor 2 phase pipe gt 9 9 Zero cross signal 0 5V DC TH32 18V DC Thermistor Shell 6 6 16V DC except for A42 Q 6 16V DC 63H High pressure switch CNAC Q to VEG TEST POINT Voltage between right pins of PC5C and PC5D pin 3 Power supply for out door controller circuit board 208V 230V AC to Power supply for indoor e pin 4 and outdoor unit con ame as nection wire CNF1 208 230V AC Vsp CNS TEST POINT Voltage between pins 1 S2 A208 230V AC of C5A C5B DC OV when stopped DC 1 6 5V CNF1 CNF2 CNDC when operated Connect to the fan motor 280V DC 0 280V DC Outdoor power circuit Communication power supply 15V DC board D71 Voltage 15V DC When stopped 7 5V DC When operated 0V 15V pulse CNF2 is only for A42 64 Outdoor noise filter circuit board PUZ A18NHA4 PUZ A18NHA4 BS PUY A12 18NHA4 PUY A12 18NHA4 BS LI NI T EI Voltage of 208 230V AC is input Connect to the terminal block TB1 Connect to the earth E2 Connect to the earth E3 Connect
65. m remote controller for 2 minutes Error code E4 Contact failure at transmission wire of remote controller All remote controllers are set as sub remote controller In this case EO is displayed on remote controller and E4 is displayed at LED LED1 LED2 on the outdoor controller circuit board Miswiring of remote controller Defective transmitting receiving circuit of remote controller Defective transmitting receiving circuit of indoor controller board of refrigerant address 0 Noise has entered into the transmission wire of remote controller D Check disconnection or looseness of indoor unit or transmission wire of remote controller Set one of the remote controllers main If there is no problem with the action above Check wiring of remote controller Total wiring length max 500m 1640ft Do not use cable x 3 or more The number of connecting indoor units max 16 units The number of connecting remote control ler max 2 units When the above mentioned problem of O are not applied Diagnose remote controllers a When RC OK is displayed remote controllers have no problem Turn the power off and on again to check If abnormality generates again replace indoor controller board b When RC NG is displayed replace remote controller c When RC E3 or ERC 00 66 is dis played noise may be causing abnormality If the unit is not normal after replacin
66. n of CN2 on the outdoor power circuit board Check the facility of power supply Correct the wiring U V W phase to com pressor Refer to 10 9 Outdoor power circuit board Check CN52C wiring Replace outdoor power circuit board A12 18 24N only Replace ACT module A30 36 42N only amp Replace outdoor power circuit board A30 36 42N only Check CNAF wiring A30 36 42N only Replace outdoor noise filter circuit board 9 Check CN5 wiring on the outdoor power circuit board Refer to 10 9 Check CN2 wiring on the outdoor power circuit board Refer to 10 9 Compressor overcurrent interruption When compressor locked Abnormal if overcurrent of DC bus or compressor is detected within 30 seconds after compressor starts operating Stop valve is closed Decrease of power supply voltage Looseness disconnection or converse of compressor wiring connection Defective compressor Defective outdoor power board Open stop valve Check facility of power supply Correct the wiring U V W phase to compressor Refer to 10 9 Outdoor power circuit board Check compressor Refer to 10 6 Replace outdoor power circuit board Current sensor error Abnormal if current sensor detects 1 5A to 1 5A during compressor operation This error is ignored in case of test run mode x This error is ignored in case of test run mode Its abnormal for
67. na No 2 below if PLEASE WAIT is displayed 2 PLEASE WAIT display is remained on the remote controller At longest 2 minutes after the power supply PLEASE WAIT is displayed to start up Communication error between the remote controller and indoor unit Communication error between the indoor and outdoor unit GOutdoor unit protection device connector is open Normal operation Self diagnosis of remote controller G PLEASE WAIT is displayed for 6 min utes at most in case of indoor outdoor unit communication error Check LED3 on indoor controller board 1 When LED3 is not blinking Check indoor outdoor connecting wire for miswiring Converse wiring of S1 and S2 or break of S3 wiring 2 When LED3 is blinking Indoor outdoor connecting wire is nor mal Check LED display on outdoor controller circuit board Refer to 10 10 Check protection device connector 63L and 63H for contact failure Refer to 10 9 When pressing the remote controller operation switch the OPERATION display is appeared but it will be turned off soon After cancelling to select function from the remote controller the remote controller operation switch will not be accepted for approx 30 seconds 45 Normal operation Phenomena Factor Countermeasure 4 Even controlling by the wireless The pair number settings of the wireless remote Check the pair number settings remote controller no beep is he
68. nal block TB1 67 Brief check of DIP IPM and DIP PFC Outdoor power circuit board x Usually they are in a state of being short circuited if they are broken PUZ A18NHA4 Measure the resistance in the following points connectors etc If they PUZ A18NHA4 BS are short circuited it means that they are broken 1 Check of DIP IPM PUY A12 18NHA4 P U P V P W N U N V N W PUY A12 18NHA4 BS 2 Check of DIP PFC P R P S R N S N R S U VW Connect to the ACL Connect to the compressor MC 208 230V AC Voltage among phases 5V to 180V AC CNN oo X LIRE S LD1 LD2 DIP PFC 280 380V DC Connect to the outdoor controller circuit board CNDC LD9 Connect to the earth Only A24 DIP IPM Ero o ID ES CN2 Connect to the outdoor controller circuit board CN2 Outdoor power circuit board gt Transmitting signal to the outdoor controller circuit board 0 5V DC CN3 CN4 Zero cross signal 0 5V DC Thermistor Connect from the Primary current detection Not used lt Heatsink gt outdoor controller Connect to the outdoor 16V DC 4 TH8 circuit board noise filter circuit board 16V DC Pe CNA CN5 68 Outdoor power circuit board PUZ A30 36 42NHA4 PUZ A30 36 42NHA4 BS PUY A30 36 42NHA4 PUY A30 36 42NHA4 BS CN2 Connect to the outdoor controller circuit board CN2 Transmitting signal to the outdoor controller circuit board 0 5V DC Z
69. nals on linear expansion valve using a tester 3 blinking Abnormality of outdoor fan motor rotational speed Check the outdoor fan motor 4 blinking Compressor overcurrent breaking Start up locked Compressor overcurrent breaking Abnormality of current sensor P B Abnormality of power module Check if stop valves are open Check looseness disconnection and converse connection of compressor wiring Measure resistance values among terminals on compressor using a tester Check if outdoor unit has a short cycle on its air duct 5 blinking Open short of discharge thermistor TH4 Open short of outdoor thermistors TH3 TH6 TH7 and TH8 Check if connectors TH3 TH4 TH6 and TH7 on outdoor controller board and conn ector CN3 on outdoor power board are not disconnected Measure resistance value of outdoor thermistors 6 blinking Abnormality of heatsink temperature Check if indoor outdoor units have a short cycle on their air ducts Measure resistance value of outdoor heatsink thermistor TH8 7 blinking Abnormality of voltage Check looseness disconnection and converse connection of compressor wiring Measure resistance value among terminals on compressor using a tester Check the continuity of contactor 52C Check if power supply voltage decreases Check the wiring of CN52C Check the wiring of CNAF 1 blinking Abnormality of room temperature the
70. ndoor outdoor unit connecting wire converse wiring or disconnection Startup time over Communication error except for outdoor unit SW2 setting Display detail The black square W indicates a switch position Explanation for display Pipe temperature Liquid TH3 40 194 40 194 40 90 C When the coil thermistor detects 0 F or below and temperature are displayed by turns Example When 10 F 0 5secs 0 5secs gt 10 2 secs Discharge temperature TH4 A42 Comp shell temperature TH32 A12 36 37 327 37 327 3 164 C When the discharge thermistor detects 100 F or more hundreds digit tens digit and ones digit are displayed by turns Example When 105 F 0 5 secs 0 5secs 1 gt 05 gt 7 2 secs Output step of outdoor FAN 0 10 The number of ON OFF times of com pressor 0 9999 0 9999 When the number of times is 100 or more hundreds digit tens digit and ones digit are displayed by turns Example When 42500 times 425 x 100 times 0 5 secs 0 5secs 4 25 gt 2 secs Compressor integrating operation times 0 9999 0 9999 When it is 100 hours or more hundreds digit tens digit and ones digit are displayed by turns Example When 2450 hours 245 x
71. ng circuit of outdoor controller circuit board Defective transmitting receiving circuit of indoor controller board Defective indoor power board 2 or more outdoor units have refrigerant address 0 In case of group control Noise has entered into power supply or indoor outdoor unit connecting wire Miswiring of indoor outdoor unit connecting wire converse wiring or disconnection Outdoor controller circuit board can automatically set the unit number of indoor units Abnormal if the indoor unit number can not be set within 4 minutes after power on because of miswiring converse wiring or disconnection of indoor outdoor unit con necting wire Contact failure or miswiring of indoor outdoor unit connecting wire Diameter or length of indoor outdoor unit connecting wire is out of specified capacity Defective transmitting receiving circuit of outdoor controller circuit board Defective transmitting receiving circuit of indoor controller board Defective indoor power board 2 or more outdoor units have refrigerant address 0 In case of group control Noise has entered into power supply or indoor outdoor unit connecting wire Start up time over The unit cannot finish start up process within 4 minutes after power on Contact failure of indoor outdoor unit connecting wire Diameter or length of indoor outdoor unit connecting wire is out of specified capacity
72. nit is turned on and off by remote controller or thermostat Error code appears and blinks on the display of remote controller Error code will be displayed if any protection devices of the air conditioner are actuated What is error code Refer to SELF DIAGNOSIS ACTION TABLE Check if servicing is required for the error Remote controller PLEASE WAIT is displayed on the screen Wait around 2 minutes An automatic startup test will be conducted for 2 minutes when power is supplied to the air conditioner PLEASE WAIT will be kept being displayed while that time Q FILTER is displayed on the Screen This indicates that it is time to clean the air filters Clean the air filters Press the FILTER button on the remote controller twice to clear FILTER from the display See the operation manual that came with the product for how to clean the filters Display time of FILTER depends on the model Long life filter 2500 hrs Standard filter 100 hrs STANDBY is displayed on the screen This is displayed when the unit starts HEAT operation when the thermostat puts the compressor in operation mode or when the outdoor unit ends DEFROST operation and returns to HEAT operation The display will automatically disappear around 10 minutes later While STANDBY is displayed on the remote controller the airflow amount will be restricted because the indoor unit s hea
73. ntroller board Refer to the electrical wiring diagram of indoor unit for how to set the indoor unit During emergency operation the air conditioner will continuously be operated by supplying power and stopping it It can not be turned on or off by remote control and temperature control is not possible Do not perform emergency heating operation for an extended period of time If the outdoor unit starts defrosting during this period cold air will blow out from the indoor unit Do not perform emergency cooling operation for more than 10 hours Neglecting this could result in freezing the heat exchanger in indoor unit 3 Emergency operation procedure Turn the main power supply off Q Turn on the emergency operation switch SWE on indoor controller board Set the shorting pins of emergency operation connector CN31 on outdoor controller board to ON Use SW4 2 on outdoor controller board to set the operation mode cooling or heating SW4 1 is not used SW4 CN31 Shorting pins ON Heating ON E O 1 2 Cooling OFF amp Turning the main power supply on will start the emergency operation 4 Releasing emergency operation Turn the main power supply off SwA4 Set the emergency operation switch SWE on indoor controller board to OFF ON Heating Set the shorting pins of emergency operation connector CN31 on outdoor controller PUZ only board to OFF Set SW4 2 on o
74. of extension pipe or converse wiring of indoor outdoor unit connecting wire n the text indicates M NET board in outdoor unit Judgment and action Address duplicate definition This error is displayed when transmission from the units of same address is detected Note The address and attribute displayed at remote controller indicate the con troller that detected abnormality There are 2 or more same address of controller of out door unit indoor unit FRESH MASTER or LOSSNAY Noise has entered into trans mission signal and signal was transformed Search the unit with same address as abnormali ty occurred If the same address is found turn off the power supply of outdoor unit and indoor unit and FRESH MASTER or LOSSNAY at the same time for 2 minutes or more after the address is corrected and turn the power on again Check transmission waveform or noise on transmission wire Hardware error of transmission processor Transmission processor intended to trans mit 0 but 1 appeared on transmission wire Note The address and attribute display at remote controller indicate the con troller that detected abnormality Error is detected if waveform is transformed when wiring works of transmission wire of outdoor unit indoor unit FRESH MASTER or LOSSNAY are done or polarity is changed with the power on and transmission data collide each other Q Defective transmitting receiving c
75. or code displayed on remote controller X2 Refer to service manual for indoor unit Replace remote controller 75 lt Outdoor unit operation monitor function gt When option part A Control Service Tool PAC SK52ST is connected to outdoor controller board CNM Digital indicator LED1 displays 2 digit number or code to inform operation condition and the meaning of error code by controlling DIP SW2 on A Control Service Tool Operation indicator SW2 Indicator change of self diagnosis The black square m indicates a switch position SW2 setting Display detail Explanation for display ON 123456 lt Digital indicator LED1 working details gt Be sure that 1 to 6 in the SW2 are set to OFF 1 Display when the power supply ON 4 second When the power supply ON blinking displays by turns interval Wait for 4 minutes at the longest m 2 When the display lights Normal operation Operation mode display Lighting LED1 aa Initial setting Y The tens digit Operation mode gt The ones digit Relay output Display Operation Model Warming up Compressor OFF FAN COOLING DRY HEATING DEFROSTING Display Compressor 4 way valve Solenoid valve ON ON Display during error postponement Postponement code is displayed when compressor stops due to the work of protection devi
76. outdoor controller cir cuit board CNMNT and M NET board CN5 Check disconnection looseness or breaking of connection wire between outdoor controller cir cuit board CNMNT and M NET board CND Check M NET transmission wiring method Error Code Abnormal point and detection method Case Judgment and action Pipe temperature lt Cooling mode gt Detected as abnormal when the pipe tem perature is not in the cooling range 3 min utes after compressor start and 6 minutes after the liquid or condenser evaporator pipe is out of cooling range Note 1 It takes at least 9 min to detect Note 2 Abnormality P8 is not detected in drying mode Cooling range Indoor pipe temperature TH2 or TH5 intake temperature TH1 3 deg 5 4 F TH Lower temperature between liquid pipe temperature and condenser evaporator temperature lt Heating mode gt When 10 seconds have passed after the compressor starts operation and the hot adjustment mode has finished the unit is detected as abnormal when condenser evaporator pipe temperature is not in heat ing range within 20 minutes Note 3 It takes at least 27 minutes to detect abnormality Note 4 It excludes the period of defrosting Detection restarts when defrosting mode is over Heating range 3 deg 5 4 F Condenser Evaporator temperature TH5 intake temperature TH1 lt M NET communication error Error Code Abnormal point and detec
77. position SW2 setting Display detail Explanation for display The number of connected indoor units 0 3 The number of connected indoor units are dis played Capacity setting display Displayed as an outdoor capacity code Capacity Capacity Code A12N A30N display A18N A36N A24N A42N Outdoor unit setting information The tens digit Total display for applied setting Setting details Display details H P Cooling only 0 H P 1 Cooling only Single phase 3 phase O Single phase 2 3 phase Code The ones digit display Setting details Display details Defrosting switch O Normal 1 For high humidity Example When heat pump 3 phase and defrosting normal are set up 20 is displayed Indoor pipe temperature Liquid TH2 1 38 190 39 88 C Indoor 1 When the temperature is O F or less 38 190 temperature are displayed by turns Indoor pipe temperature Cond Eva 38 190 39 88 C TH5 1 When the temperature is O F or less Indoor 1 temperature are displayed by turns 38 190 Indoor pipe temperature Liquid TH2 2 38 190 39 88 C Indoor 2 When the temperature is O F or less 38 190 temperature are displayed by turns Indoor pipe temperature Cond Eva 38 190 39 88 C TH5 2 When the temperature is O F
78. r Air duct short cycle Remove the shield 7 Remote controller display works Linear expansion valve fault Discharging temperature and indoor heat normally and the unit performs heat Opening cannot be adjusted well due to linear expan exchanger temperature does not rise ing operation however the capacity sion valve fault Inspect the failure by checking discharging cannot be fully obtained pressure Replace linear expansion valve Refrigerant shortage If refrigerant leaks discharging tempera ture rises and LEV opening increases Inspect leakage by checking the tempera ture and opening Check pipe connections for gas leakage Lack of insulation for refrigerant piping Check the insulation Filter clogging Open intake grill and check the filter Clean the filter by removing dirt or dust on it If the filter is clogged indoor pipe tem Heat exchanger clogging perature rises and discharging pressure increases Check if heat exchanger is clogged by inspecting discharging pres sure Clean the heat exchanger Air duct short cycle Remove the shield Bypass circuit of outdoor unit fault Check refrigerant system during operation 8 OFor 3 minutes after temperature DONormal operation Normal operation adjuster turns off the compressor For protection of compressor will not start operating even if temperature adjuster is turned on For 3 minutes after temperature adjuster tu
79. r TH4 exceeds 125 C 257 F or 110 C 230 F continuously for 5 min utes Abnormal if condenser evaporator tem perature thermistor TH5 exceeds 40 C 104 F during defrosting and discharge temperature thermistor TH4 exceeds 110 C 230 F 2 Abnormal if discharge superheat Cooling TH4 TH5 Heating TH4 TH6 increases All the conditions in A or B are detected simultaneously for 10 minutes continu ously after 6 minutes past from com pressor start up including the thermo stat indication or recovery from defrost ing Condition A Heating mode When discharge superheat is less than 70 deg 126 F When the TH6 temp is more than the value obtained by TH7 5 deg 9 F When the condensing temp of TH5 is less than 35 C 95 F Condition B During comp operation Cooling and Heating When discharge superheat is less than 80 deg 144 F in cooling When discharge super heat is less than 90 deg 162 F in heating When condensing temp of TH6 is more than 40 C 40 F In cooling only 3 Abnormal if comp shell temperature thermistor TH32 exceeds 125 C 257 F Overheated compressor opera tion caused by shortage of refrigerant Defective operation of stop valve Defective thermistor Defective outdoor controller board Defective action of linear expansion valve 37 Check intake superheat Check leakage of refrig
80. r unit If displayed address or attribute is indoor unit remote controller detects abnormal ity when remote controller transmitted to indoor unit and there was no reply ACK During group operation with indoor unit of multi refrigerant System if remote controller transmit to indoor unit while outdoor unit power supply of one refrigerant system is turned off or within 2 min utes of restart abnormality is detected Q Contact failure of transmission wire of remote controller or indoor unit Disconnection of transmission connector CN2M of indoor unit Defective transmitting receiving circuit of indoor unit or remote controller 43 Always try the followings when the error A7 occurs D Turn off the power supply of outdoor unit and indoor unit and FRESH MASTER or LOSSNAY at the same time for 2 minutes or more and turn the power on again If mal function was accidental the unit returns to normal Check address switch of abnormality gener ated address Check disconnection or looseness of abnor mality generated or abnormality detected transmission wire terminal block and con nector Check if tolerance range of transmission wire is not exceeded Check if type of transmission wire is correct or not If there were some troubles of O above repair the defective then turn off the power supply of outdoor unit and indoor unit and FRESH MASTER or LOSSNAY at the same
81. r unit power supply of one refrigerant system is turned off or within 2 minutes of restart abnormality is detected Contact failure of transmission wire of remote controller or indoor unit Disconnection of transmission connector CN2M of indoor unit Defective transmitting receiving circuit of indoor unit or remote controller 5 If displayed address or attribute is FRESH MASTER Indoor unit detects abnormality when indoor unit transmitted to FRESH MASTER and there was no reply ACK During sequential operation of indoor unit and FRESH MASTER of other refrigerant System if indoor unit transmits to FRESH MASTER while outdoor unit power supply of same refrigerant system with FRESH MASTER is turned off or within 2 minutes of restart abnormality is detected Contact failure of transmission wire of indoor unit or FRESH MASTER Disconnection of transmission connector CN2M of indoor unit or FRESH MASTER Defective transmitting receiving circuit of indoor unit or FRESH MASTER 6 If displayed address or attribute is LOSSNAY Indoor unit detects abnormality when indoor unit transmitted to LOSSNAY and there was no reply ACK QD If the power supply of LOSSNAY is turned off indoor unit detects abnormality when it transmits to LOSSNAY During sequential operation of indoor unit and LOSSNAY of other refrigerant system if indoor unit transmits to LOSSNAY while outdoor unit power supply of
82. reduced and the unit capacity will be lowered See the instruction manual that came with the product for how to clean the filters Check there is enough space around the air conditioner If there are any obstacles in the air intake or air outlet of indoor outdoor units they block the airflow direction so that the unit capacity will be lowered Sound A gas escaping sound is heard D This is not a malfunction comes out sometimes This is the sound which is heard when the flow of from the air refrigerant in the air conditioner is switched conditioner A cracking sound is heard Q This is not a malfunction sometimes This is the sound which is heard when internal parts of units expand or contract when the temperature changes A buzzing sound is heard This is not a malfunction sometimes This is the sound which is heard when the outdoor unit starts operating A ticking sound is heard from This is not a malfunction the outdoor unit sometimes This is the sound which is heard when the fan of the outdoor unit is controlling the airflow amount in order to keep the optimum operating condition A sound similar to water This is not a malfunction flowing is heard from the unit This is the sound which is heard when the refrigerant is flowing inside the indoor unit Something The fan speed does not match D This is not a malfunction During the DRY is wrong the setting of the remot
83. reen lights up lt 00 gt minutes during system startup Normal gis nen andi n Incorrect connection of outdoor terminal block L1 L2 and blink alternately F1 S1 82 S3 After startup is displayed green once and red twice Outdoor unit s protection device connector is open blink alternately F3 F5 F9 After startup is displayed Incorrect wiring between the indoor and outdoor unit Polarity green twice and red once is wrong for S1 S2 S3 No display appears even when remote cul TEF verus controller operation switch is turned on bli k alternately SES EUR a Remote controller mE ec short Operation lamp does not light up After startup is displayed only STE ISO OUIBOOT UML OL gO eS E Address is other than O green lights up lt 00 gt es TM Remote controller transmission wire is open Display appears but soon disappears After startup is displayed only After canceling function selection operation is not possible for even when remote controller is operated green lights up 00 about 30 seconds Normal After power is turned on PLEASE WAIT is displayed for 3 minutes then error code is displayed x Press the remote controller s CHECK button twice to perform self diagnosis See the table below for the contents of LCD display Contents of inferior phenomena Contents of inferior phenomena
84. rmistor TH1 Abnormality of pipe temperature thermistor Liquid TH2 Abnormality of pipe temperature thermistor Condenser Evaporator TH5 Check if connectors CN20 CN21 CN29 and CN44 on indoor controller board are not disconnected Measure resistance value of indoor thermistors 2 blinking Abnormality of drain sensor DS Float switch connector open FS Indoor drain overflow protection Check if connector CN31 CN4F on indoor controller board is not disconnected Measure resistance value of indoor thermistors GMeasure resistance value among terminals on drain pump using a tester Check if drain pump works GCheck drain function 3 blinking Freezing cooling overheating heating protection Check if indoor unit has a short cycle on its air duct Check if heat exchanger and filter is not dirty GMeasure resistance value on indoor and outdoor fan motors Check if the inside of refrigerant piping is not clogged 4 blinking Abnormality of pipe temperature Check if indoor thermistors TH2 and TH5 are not disconnected from holder Check if stop valve is open GCheck converse connection of extension pipe on plural units connection Check if indoor outdoor connecting wire is connected correctly on plural units connection 5 blinking Abnormality of indoor con troller board Replace indoor controller board Abnormality of remote con troller board X1 Err
85. rns on the compressor will not stop operating even if temperature adjuster is turned off Compressor stops operating immediately when turning off by the remote controller 46 Symptoms PLEASE WAIT is kept being displayed on the remote controller Di is fl Inspection method and tagnosiS TW troubleshooting Check the display time of PLEASE WAIT after turning on the main power 6 minutes 2 minutes or more ow long is PLEASE WAIT or less lt PLEASE WAIT lt Normal kept being displayed on the gs sd emote controller will be displayed The start up diagnosis will during the start up be over in around 2 minutes 2106 diagnosis after turning minutes on the main power Are any error codes displayed on the emote controller Check the LED display of the outdoor controller circuit board displayed on the LED JE e Miswiring of indoor Refer to Self diagnosis i outdoor connecting action table in order to wire solve the trouble NO Breaking of indoor outdoor connecting In case of communication wire S3 errors the display of Defective indoor remote controller may not controller board match the LED display of Defective outdoor the outdoor unit controller circuit board Defective indoor controller board Defective remote controller LED display of the indoor controller board LED1 6 LED2 6 LED3 6 Symptoms Nothing
86. s are defective Replace outdoor controller circuit board 2 connector open Abnormal if both 63H and 63L connector circuits are open for 3 minutes continuously after power supply 63H High pressure switch 63L Low pressure switch lt A42N only Disconnection or contact failure of connector 63H 63L on outdoor controller circuit board Disconnection or contact failure of 63H 63L 63H and 63L are operating due to defective parts Defective outdoor controller board D Check connection of connector 63H 63L on outdoor controller circuit board Refer to 10 9 Check the 63H and 63L side of connecting wire Check continuity by tester Replace the parts if the parts are defective Replace outdoor controller circuit board Indoor outdoor unit connector miswiring excessive number of units 1 Outdoor controller circuit board can automatically check the number of connected indoor units Abnormal if the number cannot be checked automatically due to miswiring of indoor outdoor unit connecting wire and etc after power is turned on for 4 minutes Abnormal if outdoor controller circuit board recognizes excessive number of indoor units Contact failure or miswiring of indoor outdoor unit connecting wire Diameter or length of indoor outdoor unit connecting wire is out of specified capacity G 4 or more indoor units are connected to 1 outdoor unit Defective transmitting receivi
87. seness disconnection or converse of compressor wiring connection Defective fan of indoor outdoor units Short cycle of indoor outdoor units Defective input circuit of out door controller board Defective compressor D Open stop valve Check facility of power supply G Correct the wiring U V W phase to compressor Refer to 10 9 Outdoor power circuit board Check indoor outdoor fan Solve short cycle Replace outdoor controller circuit board Check compressor Refer to 10 6 x Before the replacement of the outdoor controller circuit board disconnect the wiring to compressor from the outdoor power circuit board and check the output voltage among phases U V W during test run No defect on board if voltage among phases U V V W and W U is same Make sure to perform the voltage check with same performing frequency Remote controller transmission error E0 signal receiving error E4 Abnormal if main or sub remote control ler cannot receive normally any trans mission from indoor unit of refrigerant address 0 for 3 minutes Error code EO Abnormal if sub remote controller could not receive for any signal for 2 minutes Error code EO Abnormal if indoor controller board can not receive any data normally from remote controller board or from other indoor controller board for 3 minutes Error code E4 Indoor controller board cannot receive any signal fro
88. t exchanger is not fully heated up In addition to that the up down vane will be automatically set to horizontal blow in order to prevent cold air from directly blowing out to human body The up down vane will return to the setting specified by the remote controller when STANDBY is released Q DEFROST is displayed on the screen No air comes out of the unit The outdoor unit gets frosted when the outside temperature is low and the humidity is high DEFROST indicates the DEFROST operation is being performed to melt this frost The DEFROST operation ends in around 10 minutes at most 15 minutes During the DEFROST operation the indoor unit s heat exchanger becomes cold so the blower is stopped The up down vane will be automatically set to horizontal blow in order to prevent cold air from directly blowing out to human body The display will turn into STANDBY when DEFROST operation ends Phone Calls From Customers How to Respond The room cannot be cooled or heated sufficiently Check the set temperature of remote controller The outdoor unit cannot be operated if the set temperature is not appropriate The outdoor unit operates in the following modes COOL When the set temperature is lower than the room temperature HEAT When the set temperature is higher than the room temperature Check if filters are not dirty and clogged If filters are clogged the airflow amount will be
89. tension of transmission wire voltage and signal is caused by type unmatched transmis sion wire 200m With shield wire CVVS CPEVS With normal wire no shield VCTF VCTFK CVV CVS WR VVF VCT Diameter 1 25mm AWG 16 or more Accidental malfunction of abnormality generated controller 10 5 TROUBLESHOOTING BY INFERIOR PHENOMENA Phenomena Factor Check transmission waveform or noise on transmission wire Turn off the power supply of outdoor unit and indoor unit and FRESH MASTER or LOSSNAY at the same time for 2 minutes or more and turn the power on again If mal function was accidental the unit returns to normal If the same abnormality generates again controller of displayed address and attribute may be defective Countermeasure 1 Remote controller display does not work DC12V is not supplied to remote controller Power supply display is not indicated on LCD DC12 15V is supplied to remote controller however no display is indicated PLEASE WAIT is not displayed PLEASE WAIT is displayed Check LED2 on indoor controller board 1 When LED2 is lit Check the remote controller wiring for breaking or contact failure 2 When LED2 is blinking Check short circuit of remote controller wiring 3 When LED2 is not lit Refer to phenomena No 3 below Check the following Failure of remote controller if PLEASE WAIT is not displayed Refer to phenome
90. terminal block of the outdoor unit NO DC 17V to DC 28V YES 49 Breaking or poor contact of the indoor outdoor connecting wire Normal Only the unit which has the refrigerant address 0 supplies power to the remote controller Defective outdoor controller circuit board Defective outdoor controller circuit board Defective indoor controller board Influence of electromagnetic noise Defective outdoor power circuit board Defective indoor power board Fix the breaking or poor contact of the indoor outdoor connecting wire Set the refrigerant address to 0 In case of the multiple grouping System recheck the refrigerant address again Replace the outdoor controller circuit board Replace the outdoor controller circuit board Replace the indoor controller board of the indoor unit which does not operate Not abnormal There may be the influence of electromagnetic noise Check the transmission wire and get rid of the causes Replace the outdoor power circuit board Replace the indoor power board Symptoms Nothing is displayed on the remote controller Diagnosis flow LED display of the indoor controller board LED1 e LED2 gy or LED3 7 Inspection method and troubleshooting Check the voltage of the terminal block TB6 of the remote controller YES DC 10V to DC 16V NO C
91. time for 2 minutes or more and turn the power on again If there was no trouble with D above in single refrigerant system one outdoor unit controller of displayed address or attribute is defective If there was no trouble with D above in dif ferent refrigerant system 2 or more outdoor units judge with If address of abnormality source is the address that should not exist there is the unit that memorizes nonexistent address information Delete useless address informa tion with manual setting function of remote controller Only the system FRESH MASTER or LOSSNAY are connected to or the system that is equipped with group setting of differ ent refrigerant system If there was no trouble with above replace the controller board of displayed address or attribute If the unit does not return to normal multi con troller board of outdoor unit may be defective repeater circuit Replace multi controller board one by one to check if the unit returns to normal Continued to the next page From the previous page Error Code Abnormal point and detection method Case Judgment and action 4 If displayed address or attribute is remote controller Indoor unit detects abnormality when indoor unit transmitted to remote control ler and there was no reply ACK During group operation with indoor unit of multi refrigerant System if indoor unit transmit to remote controller while out doo
92. tion Open detection of thermistors TH3 and TH6 is inoperative for 10 seconds to 10 minutes after compressor starting and 10 minutes after and during defrosting XCheck which unit has abnormality in its thermistor by switching the mode of SW2 PAC SK52ST Refer to 10 10 Thermistors CQ Disconnection or contact failure of connectors Outdoor controller circuit board TH3 TH6 TH7 Outdoor power circuit board CN3 Defective thermistor Defective outdoor controller circuit board Name D Check connection of connector TH3 TH6 TH7 on the outdoor controller circuit board Check connection of connector CN3 on the outdoor power circuit board Check breaking of the lead wire for thermistor TH3 TH6 TH7 TH8 Refer to 10 9 Check resistance value of thermistor TH3 TH6 TH7 TH8 or check temperature by microprocessor Thermistor TH3 TH6 TH7 TH8 Refer to 10 6 SW2 on A Control Service Tool Refer to 10 10 Replace outdoor controller circuit board Emergency operation is available in case of abnormalities of TH3 TH6 and TH7 Open detection Refer to 10 8 Short detection Thermistor Outdoor pipe 40 C 40 F or below 90 C 194 F or above Thermistor lt Outdoor 2 phase pipe gt 40 C 40 F or below 90 C 194 F or above Thermistor lt Outdoor gt 40 C 40 F or below 90 C 194 F or above Thermistor lt Heatsink gt 27C
93. tion method Slight temperature difference between indoor room temperature and pipe liquid or condenser evaporator gt temperature thermistor Shortage of refrigerant Disconnected holder of pipe liquid or condenser evaporator thermistor Defective refrigerant circuit Converse connection of extension pipe on plural units connection Converse wiring of indoor outdoor unit connecting wire on plural units connection Defective detection of indoor room temperature and pipe lt condenser evaporator gt temperature thermistor Stop valve is not opened completely Note Indoor unit i Case Check pipe lt liquid or condenser evaporator gt temperature with room temperature display on remote controller and outdoor controller circuit board Pipe lt liquid or condenser evaporator gt temperature display is indicated by setting SW2 of outdoor controller circuit board as follows Conduct temperature check with outdoor controller circuit board after connecting A Control Service Tool PAC SK52ST Temperature display of indoor condenser evaporator pipe Indoor 1 1 2 3 4 5 6 Temperature display of indoor liquid pipe Indoor 1 ON OFF Temperature display of indoor con evaporator pipe Indoor 2 1 2 3 4 5 6 Temperature display of indoor liquid pipe Indoor 2 ON OFF A Control Service Tool SW2 setting Check converse connection
94. tion of switches The black square lI indicates a switch position Action by the switch operation ON OFF Switch No Function Effective timing Wh i ti Forced defrost 1 Start Normal in heanig Bperation dd ids Abnormal history clear Clear Normal Off or operating ON Refrigerant address When power supply ON setting Test run Operating i Under suspension Test run mode setting Heating Cooling No function No function Separate indoor outdoor unit power supplies Not used When power supply ON Pump down Normal Under suspension x1 Forced defrost should be done as follows Change the DIP SW1 1 on the outdoor controller board from OFF to ON Q Forced defrost will start by the above operation 1 if all these conditions written below are satisfied Heat mode setting 10 minutes have passed since compressor started operating or previous forced defrost finished Pipe temperature is less than or equal to 8 C 46 F Forced defrost will finish if certain conditions are satisfied Forced defrost can be done if above conditions are satisfied when DIP SW1 1 is changed from OFF to ON After DIP SW1 1 is changed from OFF to ON there is no problem if DIP SW1 1 is left ON or changed to OFF again This depends on the service conditions 71
95. tor TH7 lt Outdoor gt Thermistor TH8 lt Heatsink gt Thermistor TH32 lt Shell gt Disconnect the connector then measure the resistance with a tester At the ambient temperature 10 C 30 C 50 F 86 F Normal Abnormal 160kQ 410kQ TH4 TH32 TH3 TH6 4 3kQ 9 6kQ TH7 TH8 39kQ 105kQ Open or short Fan motor MF1 MF2 Refer to next page Solenoid valve coil lt Four way valve gt 2184 Measure the resistance between the terminals with a tester At the ambient temperature 20 C 68 F Normal Abnormal A18 36 A42 150021500 2350 1700 Open or short Motor for compressor MC pL U Measure the resistance between the terminals with a tester Winding temperature 20 C 68 F Normal Abnormal A12 18 0 3200 A24 30 36 A42 0 8800 0 2660 Open or short Linear expansion valve LEV A For A12 18 O Red H Brown Blue Orange Js Yellow White Disconnect the connector then measure the resistance with a tester Winding temperature 20 C 68 F Normal Abnormal Red White Brown Yellow Brown Blue Red Orange 46 40 Open or short Linear expansion valve LEV A For A24 42 Disconnect the connector then measure the resistance with a tester Winding temperature 20 C 68 F Normal Abnormal
96. umber address changes between 01 and 50 or 00 will change as shown below and 15 SELF CHECK TN SELF CHECK ERIT nn nn LILI LILI e The refrigerant address will begin to blink Unit number or refrigerant address approximately 3 seconds after being to be diagnosed selected and the self diagnosis process will begin G Display self diagnosis results When there is error code history For the definition of each error code refer to the indoor unit s installation manual or service handbook Alternating Display T SELFCHECK SELF CHECK 1 ERROR GODE lt _ gt LAM D fe A nn sie JA LILI e Error code 2 or 4 jaune Address 3 digits or unit number 2 digits When there is no error code history When there is no corresponding unit Reset the error history Display the error history in the diagnosis result display screen see step MI XELF CHECK pa SELF CHECK B 1 ERROR CODE emen ione VO rin zu rin zu LILI e LILI 31 ahi When the error history is reset the display will look like the one shown below Press the ON OFF button t thin 3 ds The self d S y UI CSP ay ees Press the Qiii ON OFF i on ui Mn siseconos de ee Spano ae However if you fail to resetthe error history the error content will be displayed again address or refrigerant address will blink SELF CHECK uu SELFCHECKE DS ER
97. uperheat on error occurring SHd 0 327 Cooling TH4 or TH32 TH6 Heating TH4 or TH32 TH5 0 327 0 182degC When the temperature is 100degF or more hundreds digit tens digit and ones digit are displayed by turns Example When 150degF 0 5 secs 0 5 secs 2 secs 1 gt 50 gt Sub cool on error occurring SC 0 234 Cooling TH6 TH3 Heating TH5 TH2 0 234 0 130degC When the temperature is 100degF or more hundreds digit tens digit and ones digit are displayed by turns Example When 115degF 0 5 secs 0 5 secs 1 gt 15 gt t J 2 secs Thermostat on time until error stops 0 999 0 999 When it is 100 minutes or more hundreds digit tens digit and ones digit are displayed by turns Example When 415 minutes 0 5 secs 0 5 secs 4 gt 15 gt i 2 secs Minute U9 Error status during the Error postponement period 83 Description Detection point Display Normal 00 Overvoltage error Power circuit board 01 Undervoltage error Controller circuit board 02 Input current sensor error L1 or L2 phase open error Abnormal power synchronous signal PFC error A12 18 24NHA Overvoltage Undervoltage Overcurrent PFC ACTM error Undervoltage Controller circuit board 04 Power circuit board 08 Power circuit board 1
98. utdoor controller board as shown in the right 1 2 Cooling xIf shorting pins are not set on emergency operation connector CN31 the setting remains OFF 62 5 Operation data during emergency operation During emergency operation no communication is performed with the indoor unit so the data items needed for operation are set to the following values Operation data Operation mode COOL HEAT Remarks Intake temperature TH1 27C 81 F 20 5 C 69 F Indoor fluid pipe temperature TH2 5C 41 F 45C 113 F Indoor 2 phase pipe temperature TH5 5C 41 F 50 C 122 F Set temperature 25C 77 F 22 C 72 F Outdoor fluid pipe temperature TH3 45C 113 F 5C 41 F Outdoor 2 phase pipe temperature TH6 50 C 122 F 5C 41 F Outdoor air temperature TH7 35C 95 F TC 45 F Temperature difference code intake temperature set temperature ATj 5 5 Discharge super heat SHd 30degC 54degF 30degC 54degF Sub cool SC 5degC 9degF 5degC 9degF 1 If the thermistor temperature data is normal not open short that data is loaded into the control as valid data When the unit enters emergency operation and TH values are mismatched set the thermistors to open short And the unit runs emergency operation with the values listed above X2 If one thermistor is set to open short the values of S
99. within 1 minute This control is conducted only when the HEAT operation is stopped with the electric heater ON However this control is also applied to the models which has no electric heater is wrong with the airflow direction The airflow direction is changed during COOL operation If the up down vane is set to downward in COOL operation it will be automatically set to horizontal blow by the microprocessor in order to prevent water from dropping down 41 Hr will be displayed on the remote controller if the up down vane is set to downward with the fan speed set to be less than LOW Q The airflow direction is changed during HEAT operation The airflow direction cannot be set by remote controller In HEAT operation the up down vane is automatically controlled according to the temperature of the indoor unit s heat exchanger In the following cases written below the up down vane will be set to horizontal blow and the setting cannot be changed by remote controller 1 At the beginning of the HEAT operation 2 While the outdoor unit is being stopped by thermostat or when the outdoor unit gets started to operate 3 During DEFROST operation The airflow direction will be back to the setting of remote controller when the above situations are released STANDBY will be displayed on the remote controller in case of 1 and 2 DEFROST will be displayed on the screen in case of 3

10 TROUBLESHOOTING

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