Haier MRV III-RC User Manual

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5. Maintenance
5.1 Failure code
Failure code description: (failure code of the whole system is showed as 8 bits, so totally 256 codes. Indoor failure
code should be judged by the table and the 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.
Clear failure code by indoor or outdoor.
Failure codes are distributed as follows:
0~19: Indoor failure code
20~99: Outdoor failure code
100~109: DC motor failure code
110~125: Inverter module failure code
126~127: Software auto-check failure code
Physical master unit:
Dip switches SW9, SW10, SW11 are at 0, 0, 0, LD displays failure code 20~127, it is the master failure code.
Dip switches SW9, SW10, SW11 are 1, 0, 0, LD displays failure code 20~127, it is failure code of No. 1 slave unit.
Dip switches SW9, SW10, SW11 are 2, 0, 0, LD displays failure code 20~127, it is failure code of No. 2 slave unit.
Physical slave unit:
Dip switches SW9, SW10, SW11 are at 0, 0, 0, LD displays failure code 20~127, it is single slave 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.
Inverter outdoor unit failure code indication on master unit
LED indication
on master unit
Indication on
wired controller
(hex)
Failure code
denition
Failure description Remarks
20-0 14
Defrosting
temp. sensor
Tdef1 failure
AD value is below 11 (open circuit) or over 1012
(short circuit) for 60 seconds, sensor has no alarm
when abnormal in cooling mode.
Resumable
20-1 14
Defrosting
temp. sensor
Tdef2 failure

Haier MRV III-RC Specifications

General

Brand	Haier
Model	MRV III-RC
Category	Fan
Language	English