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Midea M2OF-18HFN1-M Service Manual
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Midea M2OF-18HFN1-M Service Manual

Midea M2OF-18HFN1-M Service Manual

Moovair
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condensing units
Revision H:
Model Numbers
Model Numbers
M2OF-18HFN1-M
M2OF-18HFN1-M
M3OF-27HFN1-M
M3OF-27HFN1-M
M4OF-36HFN1-M
M4OF-36HFN1-M
M5OF-48HFN1-M
M5OF-48HFN1-M
M2OH-18HFN1-M
M2OH-18HFN1-M
M3OH-27HFN1-M
M3OH-27HFN1-M
M4OH-36HFN1-M
M4OH-36HFN1-M
M5OG-48HFN1-M-[X]
Table of Contents
1.
Indoor Unit Combination
2.
Dimension Of Outdoor Unit
3.
Refrigerant Cycle Diagram
4.
Installation Details
5.
Electronic Function
6.
Wiring Diagrams
7.
Trouble Shooting
8.
Disassembly Instructions
WARNING
Installation MUST conform with local building codes or, in the absence of local
•
codes, with the National Electrical Code NFPA70/ANSI C1-1993 or current edition
and Canadian Electrical Code Part1 CSA C.22.1.
The information contained in the manual is intended for use by a qualified service
•
technician familiar with safety procedures and equipped with the proper tools and
test instruments
Installation or repairs made by unqualified persons can result in hazards to you
•
and others.
Failure to carefully read and follow all instructions in this manual can result in
•
equipment malfunction, property damage, personal injury and/or death.
ODMFI-E-1912
Master Model Numbers
Master Model Numbers
DE18HOM23230X2
DM18HOM23230X2
DE27HOM23230X2
DM27HOM23230X2
DE36HOM23230X2
DM36HOM23230X2
DE48HOM23230X2
DM48HOM23230X2
DE18HOM25230X3
DM18HOM25230X3
DE27HOM25230X3
DM27HOM25230X3
DE36HOM25230X3
DM36HOM25230X3
DM48HOM25230X3 DM48HOM25230X3
service manual
Product code
22022316000385
22022316000327
22022316000326
22022316000545
22022316001005
22022316001006
22022316001007
1
Product code
22022316000385
22022316000327
22022316000326
22022316000545
22022316001005
22022316001006
22022316001007
22022316001165

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Summary of Contents for Midea M2OF-18HFN1-M

  • Page 1 Revision H: ODMFI-E-1912 Model Numbers Model Numbers Master Model Numbers Master Model Numbers Product code Product code M2OF-18HFN1-M M2OF-18HFN1-M DE18HOM23230X2 DM18HOM23230X2 22022316000385 22022316000385 M3OF-27HFN1-M M3OF-27HFN1-M DE27HOM23230X2 DM27HOM23230X2 22022316000327 22022316000327 M4OF-36HFN1-M M4OF-36HFN1-M DE36HOM23230X2 DM36HOM23230X2 22022316000326 22022316000326 M5OF-48HFN1-M...
  • Page 2 7.3 Outdoor Unit Display ............................40 7.4 Diagnosis and Solution ............................. 45 7.5 Trouble Criterion of Main Parts........................98 Disassembly Instructions ............................109  M2OF-18HFN1-M (WCA30 metal plate) ....................109  M2OH-18HFN1-M, M3OF-27HFN1-M, M3OH-27HFN1-M (WD30 metal plate) ......116...
  • Page 3  M4OF-36HFN1-M (WD30 metal plate) ....................124  M4OH-36HFN1-M, M5OF-48HFN1-M (WE30 metal plate) ..............131...
  • Page 5 Indoor Unit Combination Multi DC Nominal Suggested Limit Outdoor Unit capacity Combination Multi DC Nominal Suggested 9+18 Limit Outdoor Unit capacity Combination 12+12 12+18 M2OF- 18+18 5.2kW None 18HFN1-M 9+12 9+9+9 12+12 9+9+12 9+9+18 9+12 M2OH- 9+12+12 5.2kW None 18HFN1-M 9+18 9+12+18 12+12...
  • Page 6 12+12+12 9+9+12+24 12+12+18 9+9+18+18 12+12+24 9+9+18+24 12+18+18 9+12+12+12 12+18+24 9+12+12+18 9+9+9+9 9+12+12+24 9+9+9+12 9+12+18+18 9+9+9+18 9+18+18+18 9+9+9+24 12+12+12+12 9+9+12+12 12+12+12+18 9+9+12+18 12+12+12+24 9+9+12+24 12+12+18+18 9+9+18+18 9+9+9+9+9 9+12+12+12 9+9+9+9+12 9+12+12+18 9+9+9+9+18 12+12+12+12 9+9+9+9+24 12+12+12+18 9+9+9+12+12 9+9+9+12+18 9+9+9+18+18 Multi DC Nominal Suggested 9+9+12+12+12 Limit Outdoor Unit...
  • Page 7 Dimension Of Outdoor Unit Model Unit M2OF-18HFN1-M inch 33.3 14.3 27.6 36.0 21.3 13.8 M2OH-18HFN1-M 1034 M3OF-27HFN1-M inch 37.2 16.5 31.9 40.6 26.5 15.9 M3OH-27HFN1-M 1034 M4OF-36HFN1-M inch 37.2 16.5 31.9 40.6 26.5 15.9...
  • Page 8 Unit Model M4OH-36HFN1-M 1333 1060 M5OF-48HFN1-M inch 37.5 16.3 52.5 41.7 25.0 15.9 M5OG-48HFN1-M-[X]...
  • Page 9 Refrigerant Cycle Diagram 3.1 Refrigeration circuit drawing of M2OF-18HFN1-M I N D O O R O U T D O O R E X V A C A P I L L A R Y A L I Q U I D V A L V E...
  • Page 10 3.3 Refrigeration circuit drawing of M3OF-27HFN1-M & M3OH-27HFN1-M I N D O O R O U T D O O R E X V A C A P I L L A R Y A L I Q U I D V A L V E A E X V B C A P I L L A R Y B C H E C K V A L V E L I Q U I D V A L V E B...
  • Page 11 3.5 Refrigeration circuit drawing of M5OF-48HFN1-M I N D O O R O U T D O O R E X V A C A P I L L A R Y A L I Q U I D V A L V E E X V B C A P I L L A R Y B L I Q U I D V A L V E E X V C C A P I L L A R Y C...
  • Page 12 ● Refrigerant pipe diameter different Installation Details according to indoor unit to be connected. When using the extension pipe, refer to the 4.1 Wrench torque sheet for installation tables below. ● When refrigerant pipe diameter is different Outside diameter Torque Additional tightening torque from that of the outdoor unit connector (18K inch...
  • Page 13 Procedure: 1) Connect the charge hose to the charging cylinder and open the 2-way and 3-way valves. With the charge hose you disconnected from the 1. Completely tighten the flare nuts on the vacuum pump, connect it to the valve at the indoor and outdoor units.
  • Page 14 4.5 Adding Refrigerant after Long-Term System Operation Procedure Procedure 1). Confirm that both the 2-way and 3-way valves are set to the opened position 1) Connect the charge hose to the 3-way service Remove the valve stem caps and confirm that the port and open the 2-way and 3-way valve.
  • Page 15 valve. 4.7 Evacuation after servicing the outdoor unit refrigeration circuit 1. Evacuation of the complete refrigeration circuit, Indoor and outdoor unit. 1) Completely tighten the flare nuts of the indoor and outdoor units, confirm that both the 2-way and 3-way valves are set to the closed position.
  • Page 16 from the vacuum pump to the valve at the bottom of the cylinder. If the refrigerant is R410A, make the cylinder bottom up to ensure liquid charge. 2). Purge the air from the charge hose Open the valve at the bottom of the cylinder and press the check valve on the charge set to purge the air (be careful of the liquid refrigerant).
  • Page 17 ---- If outdoor fan speed is lower than 100RPM 5. Electronic Function higher than 2400RPM for 60 seconds or more, the unit stops and LED displays failure code. 5.1 Abbreviation 5.3.4 Inverter Module Protection. T1: Indoor ambient temperature ---- The inverter protection module ensures that faults related to current, voltage, or temperature T2: Middle indoor heat exchanger coil does not damage the inverter.
  • Page 18 and shutdown current CoolT4Zone5I ℃ HeatT4Zone4I T4≥15℃ Heating current limit value HeatT4Zone3I 14＞T4≥10℃ Heating current limit value HeatT4Zone2I 9＞T4≥6℃ Heating current limit CoolT4Zone4I value HeatT4Zone1I 5＞T4 Heating current limit value HeatStopI Heating stop protection current value CoolT4Zone3I 5.3.7 Indoor / Outdoor Units Communication Protection If the indoor units do not receive the feedback signal from the outdoor units for 2 consecutive...
  • Page 19 If the outdoor ambient temperature is higher than Note: The final result is an integer. the set frequency during oil return, the unit stops Use the following table and final capacity the oil return process. request to confirm the operating frequency. 5.3.11 Low Outdoor Ambient Temperature …...
  • Page 20 Capacity area Norm code (N) ℃ Standby Model Fmax=T4FREHEATMAX1 Fmax=T4FREHEATMAX2 Note: The final result is an integer. Fmax=T4FREHEATMAX3 Then modify it according to a T2 average (correction): Fmax=T4FREHEATMAX4 Note:Average value of T2：Sum T2 value of all Fmax=T4FREHEATMAX5 indoor units)/ (indoor units number Fmax=T4FREHEATMAX6 ℃...
  • Page 21 4) If the compressor cumulative running time O u t d o o r t e m p e r a t u r e ℃ reaches 120 minutes and T3<-15℃. S u p p e r h i g h f a n s p e e d Defrost Stop Conditions H i g h f a n s p e e d If any one of the following conditions is satisfied,...
  • Page 22 the initial cooling opening). The EVI valve opens 510P first, then 530P, then the counter T3/° C is cleared to 0P. Increase fan speed 2. After the compressor is stopped, LowCoolT3_ON 2.1 If the EVI valve has a valve opening action keep before the stop, the PMV_CLOSE_EE step is closed in the reverse direction after the stop, and...
  • Page 23 their average. After comparing each indoor’s T2B Failure or protection (excluding discharge with the average, the outdoor gives the following temperature protection and high/low pressure modification commands: protection) causes the four-way valve to immediately shut down. ---- If the T2B＞average, the relevant valve needs to open 16p more ---- If the T2B= average, the relevant valve’s open range remains as is...
  • Page 24 Wiring Diagrams 6.1 Wiring diagram of 1 drive 2 outdoor M2OF-18HFN1-M, M2OH-18HFN1-M...
  • Page 25 6.2 Wiring diagram of 1 drive 3 outdoor M3OF-27HFN1-M...
  • Page 26 M3OH-27HFN1-M...
  • Page 27 6.3 Wiring diagram of 1 drive 4 outdoor M4OF-36HFN1-M...
  • Page 28 M4OH-36HFN1-M 6.4 Wiring diagram of M5OF-48HFN1-M...
  • Page 29 6.5 Wiring diagram of M5OG-48HFN1-M-[X]...
  • Page 30 PCB board of M2OF-18HFN1-M, M3OF-27HFN1-M & M2OH-18HFN1-M L E D 1 s t a t u s l i g h t , b y w h i c h y o u c a n j u d g e t h e u n i t N o r m a l o r E r r o r...
  • Page 31 IPM board of M2OF-18HFN1-M, M3OF-27HFN1-M& M2OH-18HFN1-M C N 4 ( L ) - C N 5 ( N ) p o w e r s u p p l y c o n n e c t t o t h e m a i n b o a r d n o u s e f u s e 1 T / 3 .
  • Page 32 PCB board of M4OF-36HFN1-M & M3OH-27HFN1-M C o n n e c t t o t h e I n d o o r e v a p . p i p e o u t t e m p . s e n s o r T 2 B - A 、...
  • Page 33 PCB board of M5OF-48HFN1-M & M4OH-36HFN1-M IPM board of M5OF-48HFN1-M& M4OH-36HFN1-M...
  • Page 34 PCB Board of M5OG-48HFN1-M-[X] + 1 2 V D C p i p e t e m p . s e n s o r & r o o m t e m p . s e n s o r + 1 2 V D C + 1 2 V D C p u l s e w a v e b e t w e e n ( + 4 ) - G N D 5 4 3...
  • Page 35 IPM board of M5OG-48HFN1-M-[X] P F C i n d u c t o r c o n n e c t t o C o m p r e s s o r c o n n e c t t o D C m o t o r...
  • Page 36 Troubleshooting 7.1Safety Electricity is stored in capacitors, even when the power supply is shut off. Do not forget to discharge the electricity in the capacitors. The value of resistance is about 1500 ohm to 2000 ohm Electrolytic Capacitors (HIGH VOLTAGE! CAUTION!) Bulb (25-40W) The voltage in P3 and P4 in outdoor PCB is high voltage about 310V The voltage in P5 and P6 in outdoor PCB is high voltage about 310V...
  • Page 37 7.2 Indoor Unit Error Display For Old Console series MFAU-12HRFN1-M, MFAU-12HRFN1-M(B); Operation Timer De-frost Failure ★ Indoor room temperature sensor (T1 ) malfunction ★ Evaporator coil temperature sensor (T2) malfunction ★ Communication malfunction between indoor and outdoor units  ★ Low ambient temperature cut off in heating ★...
  • Page 38 —— ★ ★ Indoor unit EEPROM parameter error  ★ Inverter module (IPM) malfunction Outdoor temperature sensor(coil sensor T3 or ambient temperature ★  E0,E4 sensor T4) malfunction or Outdoor unit EEPROM parameter error  ★ ★ Outdoor fan speed malfunction ——...
  • Page 39 CS11M-09HRFN1-MX0W(A), CS11M-12HRFN1-MU5W, CS11M-18HRFN1-MT0W, CS11M-23HRFN1- MT0W; MS11M-09HRFN1-MW0W, MS11M-12HRFN1-MV0W, MS11M-09HRFN1-MX4W, MS11M- 12HRFN1-MW0W, MS11M-18HRFN1-MU0W, MS11M-24HRDN1-MT0W; 2) Aurora: MSABB-09HRFN1-MT0W, MSABB-12HRFN1-MT0W, MSABE-18HRFN1-MT0W, MSABE-24HRFN1- MT0W; 3) All Easy: MSAEB-09HRFN1-MT0W, MSAEB-12HRFN1-MT0W, MSAED-18HRFN1-MT0W, MSAED-23HRFN1- MT0W; 4) Vertu Plus: MSVPB-09HRFN1-MW0W, MSVPC-12HRFN1-MU0W, MSVPD-18HRFN1-MT0W, MSVPD-22HRFN1- MT0W; 5) Mission: MSMBB-09HRFN1-MW0W, MSMBB-12HRFN1-MU0W, MSMBD-18HRFN1-MT0W, MSMBD- 23HRFN1-MT0W;...
  • Page 40 ——  ★ 1 times Current overload protection ★ 2 times  Outdoor ambient temperature sensor (T4 ) malfunction ★ 3 times  Condenser coil temperature sensor (T3) malfunction ★ 4 times  Compressor discharge temperature sensor (T5) malfunction ★ 5 times ...
  • Page 41 Display Remark Number Presses Normal display Displays running frequency, running state, or malfunction code Quantity of indoor units with working connection Actual data Display Number of indoor unit Outdoor unit running mode code Off: 0,Fan only: 1, Cooling: 2, Heating: 3, Forced cooling: 4. Forced defrost:A Indoor unit A capacity Indoor unit B capacity...
  • Page 42 units' amendatory capacity demand The frequency after the frequency limit The frequency sending to compressor control chip Indoor unit A evaporator outlet temperature (T Indoor unit B evaporator outlet temperature (T ℃ , the digital display shows “-9.” If the If the temperature is lower than -9 Indoor unit C evaporator outlet temperature ℃...
  • Page 43 F indoor unit evaporator outlet temperature (T F indoor unit room temperature (T F indoor unit evaporator temperature (T EXV open angle for F indoor unit Reason of stop EVI valve target angle(only for M5OG- Actual data/4. 48HFN1-M-[X]) EVI valve open angle(only for M5OG- If the value is higher than 99, the digital display tube will show 48HFN1-M-[X]) single digit and tens digit.
  • Page 44 7.3.3 Outdoor unit error display Display LED STATUS New indoor Error Outdoor unit EEPROM parameter error Communication malfunction between indoor and outdoor units Communication malfunction between IPM board and outdoor main control —— board Outdoor temperature sensor (coil sensor T3,ambient sensor T4, Compressor F2/F1/F3/F6 discharge sensor T5、indoor coil outlet pipe sensor T2B) malfunction Over-voltage or under-voltage protection...
  • Page 45 7.4 Diagnosis and Solution 7.4.1 Indoor unit trouble shooting 7.4.1.1 Indoor unit EEPROM parameter error diagnosis and solution. Malfunction conditions Indoor or outdoor PCB main chip does not receive feedback from EEPROM chip. Potential causes Installation mistake ● Faulty PCB ●...
  • Page 46 7.4.1.2 Communication malfunction between indoor and outdoor units diagnosis and solution. Malfunction conditions If indoor unit does not receive the feedback from outdoor unit during 120 seconds. ● Wiring mistake Potential causes ● Faulty indoor or outdoor PCB Trouble shooting:...
  • Page 47 Indoor / outdoor units communication error Start: Power off , then Power on the A/C by the Breaker. (reconnect the power wire). Is it still displaying the error code? Check wiring on the outdoor and indoor terminal follow the wiring diagram. Is all Reconnect the wiring connecting correctly? Reconnect the wiring...
  • Page 48 Pic 1: Use a multimeter to test the DC voltage between 2(old: L2) port and S port of outdoor unit. The red pin of multimeter connects with 2 (old: L2) port while the black pin is for S port. When AC is normal running, the voltage will move alternately between positive value and negative value.
  • Page 49 Pic 2: IPM (for 2 zone/ 3-zone) Operating Standby els)
  • Page 50 Pic 2: IPM (for 4 zone&5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby. els)
  • Page 51 PIC 4: Check point button, press 1 time for check how many indoor units are connected. 7.4.1.3 Zero-crossing signal detection error diagnosis and solution. Malfunction conditions When PCB does not receive zero crossing signal feedback for 4 minutes or the zero crossing signal time interval is abnormal. ●...
  • Page 52 7.4.1.4 Indoor fan speed malfunction diagnosis and solution. Malfunction conditions When indoor fan speed is too low (300RPM) for a certain period of time, the unit ceases operation and the LED displays a failure code. Potential causes Wiring mistake ● Faulty fan assembly ●...
  • Page 53 Index 1: 1: Indoor AC fan motor Power on and set the unit running in fan mode at high fan speed. After running for 15 seconds, measure the voltage of pin1 and pin2. If the value of the voltage is less than 100V (208~240V power supply)or 50V(115V power supply), the PCB must have problems and need to be replaced.
  • Page 54 7.4.1.5 Temperature sensor malfunction diagnosis and solution. Malfunction conditions If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED displays a failure. Wiring mistake Potential causes ● Faulty sensor ● Faulty PCB ● Trouble shooting: Check the connections between temperature Correct the connections.
  • Page 55 7.4.1.6 Inverter module (IPM) malfunction diagnosis and solution. Malfunction conditions When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show “P6” and AC will turn off. ● Wiring mistake Potential causes ● IPM malfunction ●...
  • Page 56 IPM module protection Check whether the voltage range Check whether the input Regulate it to correct, then of P-N on IPM module is normal? power supply is correct? check whether the system DC277-356V for 18-27KBtu/h; 208-230V, 1N, 60Hz can work normally? DC277-410V for 36K-48KBtu/h Check whether the connecting line between main board and...
  • Page 57 7.4.1.7 Over-voltage or under-voltage protection diagnosis and solution. Voltage protection Check the voltage of outdoor unit power supply, whether the voltage Check the power supply between L(L1) and N (L2) is about 187~253VAC Check whether the voltage of IPM board P and N is normal? DC277-356V for 18-27KBtu/h;...
  • Page 58 7.4.1.8 Compressor drive malfunction diagnosis and solution The trouble shooting is same with one of IPM module protection. Water-level alarm malfunction 7.4.1.9 diagnosis and solution Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure code. ●...
  • Page 59 7.4.1.10 Indoor units mode conflict Error Code P5(old model) or - -(new model) Malfunction conditions The indoor units cannot work cooling mode and heating at same time. Heating mode has a priority. ● Suppose Indoor unit A working in cooling mode or fan mode, and Potential causes indoor unit B is set to heating mode, then A will change to off and B will work in heating mode.
  • Page 60 7.4.1.11 High temperature protection of IPM board diagnosis and solution High temperature protection of IPM High temperature protection of IPM board board Check whether the radiator is Check whether the radiator is Fix the radiator well Fix the radiator well fixed well ? fixed well ? Check whether electronic...
  • Page 61 7.4.2 Outdoor unit trouble shooting 7.4.2.1 E0 (Outdoor unit EEPROM parameter error) diagnosis and solution Error Code Malfunction PCB main chip does not receive feedback from EEPROM chip conditions ● Installation mistake Potential causes ● Faulty PCB Trouble shooting: Outdoor EEPROM malfunction Outdoor EEPROM malfunction Power off, then restart the Power off, then restart the...
  • Page 62 7.4.2.2 E2(Communication malfunction between indoor and outdoor units) diagnosis and solution. Error Code Malfunction Indoor unit does not receive the feedback from outdoor unit during 120 seconds or outdoor unit does not receive the conditions feedback from any one indoor unit during 180 seconds. ●...
  • Page 63 Communication malfunction between indoor and outdoor units Start: Power off , then Power on the A/C by the Breaker. (reconnect the power wire). Is it still displaying the error code? Check wiring on the outdoor and indoor terminal follow the wiring diagram. Is all Reconnect the wiring connecting correctly? Reconnect the wiring...
  • Page 64 Pic 1: Use a multimeter to test the DC voltage between 2(old: L2) port and 3 port of outdoor unit. The red pin of multimeter connects with 2 (old: L2) port while the black pin is for 3 port. When AC is normal running, the voltage will move alternately between positive value and negative value.
  • Page 65 Pic 2: IPM board (for 2 zone/ 3-zone) Operating Standby els)
  • Page 66 Pic 2: IPM (for 4 zone & 5 zone) Operating Standby Power PIC3: Main board LED when power on and unit standby. els)
  • Page 67 PIC 4: Check point button, press 1 time for check how many indoor units are connected.
  • Page 68 7.4.2.3 E3 (Communication malfunction between IPM board and outdoor main control board) diagnosis Error Code Malfunction PCB main chip does not receive feedback from IPM module during 60 seconds. conditions ● Wiring mistake Potential causes ● Faulty PCB Trouble shooting: Communication malfunction between IPM board and outdoor main board Is there at least one LED in...
  • Page 69 Remark: Use a multimeter to test the DC voltage between black pin and white pin of signal wire The normal value should be around 5V. Use a multimeter to test the DC voltage between black pin and red pin of signal wire. The normal value should be around 12V.
  • Page 70 7.4.2.4 E4 (Outdoor temperature sensor (coil sensor T3,ambient sensor T4, Compressor discharge sensor T5、indoor coil outlet pipe sensor T2B) malfunction) diagnosis and solution F1/F2/F3/F4/F5 (No.A,B,C,D,E Indoor unit coil outlet temp. sensor malfunction) diagnosis and solution. Error Code E4/F1/F2/F3/F4/F5 Malfunction If the sampling voltage is lower than 0.06V or higher than 4.94V, the LED will display the failure.
  • Page 71 7.4.2.5 E5 (Over-voltage or under-voltage protection) diagnosis and solution. Error Code Malfunction conditions An abnormal voltage rise or drop is detected by checking the specified voltage detection circuit. ● Power supply problems. Potential causes ● System leakage or block ● Faulty PCB Trouble shooting: Voltage protection Check the voltage of...
  • Page 72 IPM board (for 2-zone /3-zone) Bridge rectifier (for 2-zone/3-zone) Remark: Measure the DC voltage between + and - port. The normal value should be 190V~250V. P(or E1/E2/E3)-N(GND) (for 2-zone/3-zone) Bridge rectifier (for 2-zone/3-zone) IPM Module (for 2-zone/3-zone)
  • Page 73 IPM board (for 4-zone)
  • Page 74 Bridge rectifier (for 5-zone) Remark: Measure the DC voltage between + and - port. The normal value should be 190V~250V. IPM board (for 5-zone) IPM Module (for 5-zone)
  • Page 75 7.4.2.6 E6 (PFC module protection) error diagnosis and solution. Error Code Malfunction When the voltage signal that PFC sends to main control board is abnormal, the display LED will show “E6” and AC will turn conditions off. ● Wiring mistake Potential causes ●...
  • Page 76 PFC module protection Check whether the connecting line between Connect it tightly, check main board and the PFC normal or not module(IPM module) is connected tightly Check whether the voltage range of P-N on IPM Replace the outdoor main board module is normal? DC277- 356V for 18-27KBtu/h;...
  • Page 77 Inductance Two ports of the inductance...
  • Page 78 7.4.2.7 E8 (Outdoor fan speed malfunction) diagnosis and solution Error Code Malfunction conditions When outdoor fan speed keeps too low (300RPM) or too high(2400RPM) for certain time, the unit will stop and the LED will display the failure. ● Wiring mistake Potential causes ●...
  • Page 79 Index 1:  1. DC fan motor(control chip is inside fan motor) Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor connector. If the value of the voltage is not in the range showing in below table, the PCB must have problems and need to be replaced.
  • Page 81  2. DC Fan Motor (control chip is in PCB) Release the UVW connector. Measure the resistance of U-V, U-W, and V-W. If the resistances are not equal to each other, the fan motor may be experiencing problems and need to be replaced.
  • Page 82 7.4.2.8 P1 (High pressure protection) diagnosis and solution. Error Code Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure. ● Wiring mistake Potential causes ● Faulty over load protector ● System block ● Faulty outdoor PCB Trouble shooting:...
  • Page 83 High pressure protection High pressure protection Whether the wiring Whether the wiring between the high pressure between the high pressure switch and main control switch and main control Connect it well Connect it well board is connected well or board is connected well or correctly correctly Whether the high...
  • Page 85 7.4.2.9 P2 (Low pressure protection) diagnosis and solution. Error Code Malfunction conditions If the sampling voltage is not 5V, the LED will display the failure. ● Wiring mistake Potential causes ● Faulty over load protector ● System block ● Faulty outdoor PCB Trouble shooting:...
  • Page 86 Low pressure protection Low pressure protection Whether the wiring Whether the wiring between the low pressure between the low pressure protector and main control Connect it well protector and main control Connect it well board is connected well or board is connected well or correctly correctly Whether the low...
  • Page 88 7.4.2.10 P3 (Current overload protection) diagnosis and solution. Error Code Malfunction conditions If the outdoor current exceeds the current limit value, the LED will display the failure. ● Wiring mistake Potential causes ● Faulty over load protector ● System block ●...
  • Page 89 Current protection of compressor Judge 1: Check whether the input current of the power supply wire is more than 15A(18K) (For 27K&hyper heat 18K, it is Replace outdoor main board 18.5A.For 36K&hyper heat 27K, it is 22.5A.For 48K&hyper heat 36K, it is 28A) Check whether the refrigerant system is ok...
  • Page 91 7.4.2.11 P4 (Temperature protection of compressor discharge) diagnosis and solution. Error Code Malfunction conditions When the compressor discharge temperature(T5) is more than 115℃ for 10 seconds, the compressor will stop restart till T5 is less than 90℃. ● Refrigerant leakage Potential causes ●...
  • Page 92 7.4.2.12 P5 (High temperature protection of condenser) diagnosis and solution. Error Code Malfunction conditions When outdoor pipe temperature is more than 65° C, the unit will stop, and unit runs again when outdoor pipe temperature is less than 52° C ●...
  • Page 93 7.4.2.13 P6 (Inverter module (IPM) malfunction) diagnosis and solution. Error Code Malfunction conditions When the voltage signal that IPM send to compressor drive chip is abnormal, the display LED will show “P6” and AC will turn off. ● Wiring mistake Potential causes ●...
  • Page 94 IPM module protection Check whether the voltage range Check whether the input Regulate it to correct, then of P-N on IPM module is normal? power supply is correct? check whether the system DC277-356V for 18-27KBtu/h; 208-230V, 1N, 60Hz can work normally? DC277-410V for 36-48KBtu/h Check whether the connecting Connect it tightly,...
  • Page 95 7.4. 2.14 . High temperature protection of compressor top(IDU P2/ODU P0) Malfunction decision If the sampling voltage is not 5V, the LED will display the failure. conditions Supposed causes Faulty overload protector ● Wiring mistake ● System leakage or block ●...
  • Page 96 7.4. 2.15 The cooling operation or heating operation does not operate. ● Faulty 4-way valve Potential causes Check of 4-way, please refer to part 5 in 9.5 Trouble Criterion Of Main Parts. 7.4.2.16 When cooling, heat exchanger of non-operating indoor unit frosts. When heating, non-operating indoor unit get warm.
  • Page 97 7.4.2.17 Communication malfunction between adapter board and outdoor main control board(ODU Ed) Malfunction decision If outdoor PCB does not receive feedback from adapter board. conditions Supposed causes Wiring mistake ● Faulty PCB ● Power off, then restart the unit after 3 minutes.
  • Page 98 7.5 Trouble Criterion of Main Parts. 1.Temperature sensor checking Disconnect the temperature sensor from PCB, measure the resistance value with a tester. Temperature Sensors. Room temp.(T1) sensor, Indoor coil temp.(T2) sensor, Outdoor coil temp.(T3) sensor, Outdoor ambient temp.(T4) sensor, Compressor discharge temp.(T5) sensor. Measure the resistance value of each winding by using the multi-meter.
  • Page 99 Appendix 1 Temperature Sensor Resistance Value Table (℃--K) ℃ ℃ ℃ ℃ K Ohm K Ohm K Ohm K Ohm 12.6431 2.35774 0.62973 115.266 108.146 12.0561 2.27249 0.61148 101.517 11.5000 2.19073 0.59386 96.3423 10.9731 2.11241 0.57683 89.5865 10.4736 2.03732 0.56038 84.2190 10.000 1.96532...
  • Page 101 Appendix 2 Unit: ℃---K Discharge temp. sensor table 542.7 68.66 13.59 3.702 511.9 65.62 13.11 3.595 62.73 12.65 3.492 455.9 59.98 12.21 3.392 430.5 57.37 11.79 3.296 406.7 54.89 11.38 3.203 384.3 52.53 10.99 3.113 363.3 50.28 10.61 3.025 343.6 48.14 10.25 2.941...
  • Page 102 Appendix 3: ℃ 10 11 12 13 14 15 16 17 18 19 20 21 22 ℉ 48 50 52 54 56 58 60 62 64 66 68 70 72 ℃ 23 24 25 26 27 28 29 30 31 32 33 34 35 ℉...
  • Page 103 3. IPM continuity check Turn off the power, let the large capacity electrolytic capacitors discharge completely, and dismount the IPM. Use a digital tester to measure the resistance between P and UVWN; UVW and N. Normal Normal resistance Digital tester Digital tester resistance value...
  • Page 104 Position Resistance Value YDK53- YDK70-6FB YDK180-8GB YSK27-4G YSK68-4B YDK45-6B YSK25-6L 6FB(B) 56Ω± 8% 24.5Ω± 8% 317Ω± 8% 145Ω± 8% 345Ω± 8% 627Ω± 8% 88.5Ω± 8% Black - (20℃) (20℃) (20℃) (20℃) (20℃) (20℃) (20℃) 76Ω± 8% 19Ω± 8% 252Ω± 8% 88Ω±...
  • Page 105 6.EXV check Disconnect the connectors.
  • Page 106 Red Brown Blue Orange Yellow White Resistance to EXV coil Color of lead wire Normal Value Red- Blue Red - Yellow About 50Ω Brown-Orange Brown-White...
  • Page 107 Red- Blue Brown-Orange Red - Yellow...
  • Page 108 Brown-White...
  • Page 109 Disassembly Instructions Note: This part is for reference, the photos may have slight difference with your machine.  M2OF-18HFN1-M (WCA30 metal plate) Part name Procedures Remarks How to remove the fan assembly assembly. 1) Turn off the air conditioner ②...
  • Page 110 cover. (3 screws) 6) Remove the cover of electrical control box. ⑦ 7) Disconnect the fan motor connector CN14(3p,white) from the IPM board. ⑧ 8) Remove the fan motor after unfastening four fixing screws. Panel plate How to remove the panel plate.
  • Page 111 Screws of front panel 2) Remove the screws of big handle, and remove the big handle.(4 screws) Screws of big handle 3) Remove two screws of Screws of terminal board and seven terminal board screws of right-rear panel, and remove the right-rear panel.
  • Page 112 Electrical How to remove the electrical parts parts. 1) Perform work of item 1,2. 2) Remove the four screws fixing the IPM board. IPM board PCB board Unfasten the connector ④ of the reactor. Unfasten the connector of the compressor. ③...
  • Page 113 CN17:T3/T4 temperature sensor CN15 CN17 CN18/CN19 CN25/CN23 (2p/2p,white) CN7: Discharge temperature sensor (2p,white) CN15:T2B-A,B temperature sensor (2p/2p,white) CN18/CN19: Electronic expansion valve A,B (6p/6p,red/red) CN25/CN23: S-A,S-B (3p/3p,white/white) Wires: CN5/CN6 CN1/CN2 CN1/CN2: 4-way valve (blue-blue) CN5/CN6: Crankcase heating cable (red-red) ⑧ CN3:L-IN (red) CN4:N-IN (black) Disconnect the grounding wire (yellow-green)
  • Page 114 Compressor How to remove the compressor. 1) Perform work of item 1,2. 2) Remove the cover of electrical control box. 3) Extract refrigerant gas. 4) Remove the sound insulation material and crankcase heating cable. 5) Remove terminal cover of compressor, and disconnect wires of ⑥...
  • Page 115 Reactor How to remove the reactor 1) Perform work of item 2 2) Unfasten the connector between IPM and reactor. ② 3) Remove three screws of reactor, and remove the reactor. Screws of cover of inductance The 4-way How to remove the 4-way valve valve 1) Perform work of item 2.
  • Page 116 How to remove the expansion expansion valve valve 1) Perform work of item 1,2. 2) Remove the electrical parts Expansion valves from item 3.. 3) Remove the coils. 4) Detach the welded parts of Coils expansion valves and pipes.  M2OH-18HFN1-M, M3OF-27HFN1-M, M3OH-27HFN1-M (WD30 metal plate) Part name Procedures Remarks...
  • Page 117 panel, and remove the front panel. (8 screws) Screws of front panel Screws of right front side panel Screws of front panel 6) Remove two screws of terminal board, screws of water collector and fifteen Screws of front panel screws of right-rear panel, and remove the right-rear panel.
  • Page 118 Screws of right-rear panel Screws of terminal board...
  • Page 119 How to remove the fan assembly. assembly 1) Remove the top cover, right front side panel and ② front panel from item 1.step 2) Remove the hex nut fixing the fan. ④ 3) Remove the fan. 4) Remove the cover of electrical control box cover.
  • Page 120 How to remove the electrical ③ parts. Electrical parts 1) Perform work of item 1,2. 2) Remove the four screws fixing the IPM board. Unfasten the connector of the reactor. IPM board PCB board Unfasten the connector of the compressor. Disconnect following 3 ④...
  • Page 121 Disconnect the CN17 CN15 CN7 CN18/CN19/CN22 connectors and wires connected from PCB and other parts. Connectors: CN17:T3/T4 temperature sensor (2p/2p,white) CN20 CN7: Discharge temperature sensor CN23 (2p,white) CN25 CN15:T2B-A,B,C temperature sensor (2p/2p/2p,white) CN18/CN19/CN22: Electronic expansion valve A,B,C (6p/6p/6p,red/red/red) CN25/CN23/CN20: S-A,S-B,S-C (3p/3p/3p,white/white/white) CN1/CN2 CN5/CN6...
  • Page 122 How to remove the compressor. Compressor 1) Perform work of item 1,2,3. 2) Remove the electrical control box and partition plate. ⑥ 3) Extract refrigerant gas. 4) Remove the sound insulation material and crankcase heating cable. 5) Remove terminal cover of compressor, and disconnect wires of compressor thermo and...
  • Page 123 Reactor How to remove the reactor 1) Perform work of item 1,2 2) Unfasten the connector between IPM and reactor. 3) Remove two screws of cover of inductance, and remove the cover of Screws of cover of inductance inductance 4) Disconnect two pieces of wires connected from the cover of inductance.
  • Page 124 How to remove the expansion expansion valve valve 1) Perform work of item 1,2. 2) Remove the electrical parts Expansion valves from item 3. 3) Remove the coils. 4) Detach the welded parts of expansion valves and pipes.  M4OF-36HFN1-M (WD30 metal plate) Part name Procedures Remarks...
  • Page 125 panel, and remove the front panel. (8 screws) Screws of front panel Screws of right front side panel Screws of front panel 6) Remove two screws of terminal board, screws of water collector and fifteen Screws of front panel screws of right-rear panel, and remove the right-rear panel.
  • Page 126 Screws of right-rear panel Screws of terminal board How to remove the fan assembly. assembly 1) Remove the top cover, ② right front side panel and front panel from item 1.step 2) Remove the hex nut fixing the fan.
  • Page 127 3) Remove the fan. ④ 4) Unfix the hooks and remove the screws, then open the electronic control box. 5) Disconnect the fan motor ⑤ connector CN19(3p,white) from the driver board. Remove the fan motor after unfastening four fixing ⑥ screws.
  • Page 128 pieces of connection wires and ④ connectors between driver board and PCB. CN55-CN7(7p,white) CN54-CN6(red) CN53-CN5(black) 6) Remove the fixing screws, then move the driver board. Disconnect the CN53 connectors and wires CN54 connected from PCB and other parts. Connectors: CN8:T3/T4 temperature sensor (2p/2p,white) CN55 CN33: Discharge temperature sensor...
  • Page 129 CN10/CN44: Crankcase heating cable (black-red) CN13 CN1:L1-IN (red) CN10 CN33 CN22 CN2:L2-IN (black) CN40 CN44 CN2 CN1 Disconnect the grounding wire (yellow-green) after removing the right-rear panel. 9) Remove the PCB board. ⑧ How to remove the compressor. Compressor 1) Perform work of item 1,2,3. 2) Remove the electrical control box and partition plate.
  • Page 130 6) Remove the discharge pipe and suction pipe with a burner. 7) Remove the hex nuts and washers fixing the compressor to bottom plate. 8) Lift the compressor. The 4-way How to remove the 4-way valve valve Coil 1) Perform work of item 1,2. 2) Extract refrigerant gas.
  • Page 131  M4OH-36HFN1-M, M5OF-48HFN1-M (WE30 metal plate) Part name Procedures Remarks How to remove the fan assembly assembly. Turn off the air ② conditioner. Turn off the power breaker. 2) Remove the screws of air outlet grille(8 screws) 3) Remove the hex nut fixing the fan.
  • Page 132 Screws of top cover 5) Remove the screws of top cover, and remove the top cover. (4 screws) 6) Remove the screws of front side panel, and remove the front side panel (1 screw) ⑥ 7) Disconnect the fan motor connectors FAN1(3p,white) and FAN2(3p,white) from DC motor driver board.
  • Page 133 Panel plate How to remove the panel plate. 4) Remove big handle.(2 Screws screws) and water of big handle collector(2 screws) 5) Remove 2 screws of Screws of Water collector terminal board and 15 screws of right-rear panel, and remove the right-rear Screws of panel.
  • Page 134 2) Disconnect the fan motor Connector(5p,white) from the IPM board. Disconnect following 8 pieces of connection wires and connectors between IPM and other parts. CN2(yellow) CN1(red) CN6(black) CN3(yellow) U、V、W(black) CN9(10p,white) 4) Remove the fixing screws then remove the IPM board. Disconnect the connectors and wires connected from PCB and other...
  • Page 135 CN8: Discharge temperature sensor (2p,white) CN12：Heatsink temperature sensor(2p,red) CN13 CN16 CN9:T3/T4 temperature sensor CN21 (2p/2p,white) CN29 CN37 CN8 CN12 CN11:T2B-A,B,C,D,E temperature CN9 CN11 sensor (2p/2p/2p/2p/2p,white) CN15/CN23/CN26/CN30/CN33: Electronic expansion valve (6p/6p/6p/6p/6p,red) CN37/CN29/CN21/CN16/CN13: S- A,S-B,S-C,S-D,S-E (3p/3p/3p/3p/3p,white) CN10: High and low pressure switch (2p/2p, white) CN10 CN30/CN23/CN33/CN26/CN15...
  • Page 136 Compressor How to remove the compressor. 1) Perform work of item 1 step 5~6 and item 2.. ⑤ 2) Extract refrigerant gas. 3) Remove the sound insulation material and crankcase heating cable. 4) Remove terminal cover of compressor, and disconnect wires of crankcase electric heater and compressor from the terminal.
  • Page 137 The 4-way How to remove the 4-way valve valve 6) Perform work of item 1 step 5~6 and item 2.. Coil 7) Extract refrigerant gas. Welded parts 8) Remove the electrical parts from item 3. 9) Remove fixing screw of the coil, and remove the coil.
  • Page 138  M5OG-48HFN1-M-[X] (WE30 metal plate) Part name Procedures Remarks How to remove the fan assembly assembly. 1) Turn off the air ② conditioner. Turn off the power breaker. 2) Remove the screws of air outlet grille(8 screws) 3) Remove the hex nut fixing 4) the fan.
  • Page 139 7) Remove the screws of front side panel, and remove the front side panel (1 screw) ⑥ 8) Disconnect the fan motor 9) connectors FAN1(3p,white) and ⑧ FAN2(3p,white) from DC motor driver board. 10) Remove the fan motor after unfastening fixing screws.
  • Page 140 Screws of terminal board Screws of right- rear panel Screws of right- rear panel Electrical How to remove the electrical parts parts. 1) Perform work of item 1 step 5~6 and item 2. Adapter board IPM board PCB board 2) Disconnect the fan motor Connector(5p,white) from the IPM board.
  • Page 141 3) Disconnect following 6 pieces of connection wires and connectors between IPM and other parts. CN3(red) CN2(black) U(blue),V(red),W(black) CN9(10p,white) CN8,CN5(3p) Remove the 4 screws and unfix the 4 hooks and then remove the IPM module board. Disconnect the CN13 connectors and wires CN16 CN21 connected from PCB and other...
  • Page 142 CN37/CN29/CN21/CN16/CN13/CN7: S-A,S-B,S-C,S-D,S-E (3p/3p/3p/3p/3p,white) CN10: High and low pressure switch (2p/2p, white) Wires: ⑥ CN17/CN18: 4-way valve (blue-blue) CN19/CN20: connected to crankcase heating cable. (black-red) CN24/CN25: Electric heater of chassis (orange-orange) CN1:L-IN (red) CN3:N-IN (black) 6) Disconnect the grounding wire (yellow-green) after removing the big handle.
  • Page 143 Compressor How to remove the compressor. 1) Perform work of item 1 step 5~6 and item 2. ⑤ 2) Extract refrigerant gas. 3) Remove the sound insulation material and crankcase heating cable. 4) Remove terminal cover of compressor, and disconnect wires of crankcase electric heater and compressor from the terminal.
  • Page 144 The 4-way How to remove the 4-way valve valve 1) Perform work of item 1 step 5~6 and item 2. Coil 2) Extract refrigerant gas. Welded parts 3) Remove the electrical parts from item 3. 4) Remove fixing screw of the coil, and remove the coil.

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