Haier MRV5-H - Service Diagnosis; Error Code

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8. Service Diagnosis
8.1 Error Code
Failure Codes
Failure code description: (failure code of the whole system is showed as 8 bits, so 256 codes. Indoor failure code is
listed in the table and by unit number)
• Outdoor failure code exists in EEPROM, in which 5 failure codes can be kept.
• Indoor failure code exists in EEPROM, in which 5 failure codes can be kept.
• Can clear failure code by indoor or outdoor.
Failure codes are distributed as following: 0~19: indoor failure code
0~19: indoor failure code
20~99: outdoor failure code
100~109: DC motor failure code
110~125: inverter module failure code
126~127: soft auto-check failure code
Physical main unit:
Dip switch SW9, SW10, SW11 are at 0,0,0, digital tube displays failure code 20-127, it is the main failure code.
Dip switch SW9, SW10, SW11 are 1,0,0, digital tube displays failure code 20-127, it is failure code of No.1 sub unit.
Dip switch SW9, SW10, SW11 are 2,0,0, digital tube displays failure code 20-127, it is failure code of No.2 sub unit.
Physical sub unit:
Dip switch SW9, SW10, SW11 are at 0,0,0, digital tube displays failure code 20-127, it is single sub unit failure code.
Outdoor failure code display principle on wired controller:
When outdoor compressor is running, indoor wired controller will display the failure code of outdoor with higher priority.
When compressor stops, it displays all indoor failures. The indoor failures will be classied as below: sensor failure,
inverter board failure, fan motor driving board failure, any protections etc.
Digital Tube
Indication on
Main Unit
Failure Code
Denition
Failure Description Remarks
20-0
Defrosting temp
sensor Tdef failure
AD value is below 11(open circuit) or over 1012(short circuit) for 60 seconds, in
cooling mode, if the sensor is abnormal, the unit does not deal with it, besides,
in defrosting and within 3 minutes after defrosting, no alarm
Resumable
21
Ambient temp
sensor Ta failure
AD value is below 11(open circuit) or over1012(short circuit) for 60 seconds
22-2 Ts(acc) failure
23-0
Discharging temp
sensor Td1 failure
AD value is below 11(open circuit) or over1012(short circuit) for 60 seconds
23-1
Discharging temp
sensor Td2 failure
24-0
Modular heat
sensor Th failure
AD value is below 11(open circuit) or over1012(short circuit) for 60 seconds
24-1
Oil temp sensor
Toil1 failure
AD value is below 11(open circuit) or over1012(short circuit) for 60 seconds
24-2
Oil temp sensor
Toil2 failure
25-0
Inlet temp of heat
exchanger Toci1
failure
AD value is below 11(open circuit) or over1012(short circuit) for 60 seconds
26-0
Indoor
commuication
failure
For continuous 200 cycles, can not nd connected indoors
26-1 For continuous 270 s, the searched indoor quantity is less than the set quantity
26-2 For continuous 170 s, the searched indoor quantity is more than the set quantity