53
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.
Failure codes are distributed as following:
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 switch SW9, SW10, SW11 are at 0, 0, 0, LD displays failure code 20~127, it is the master
failure code.
DIP switch SW9, SW10, SW11 are 1, 0, 0, LD displays failure code 20~127, it is failure code of
No. 1 slave unit.
DIP switch 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 switch 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 classified as below: sensor failure, inverter board failure, fan motor driving board
failure, any protections.
Outdoor unit failure code
Failure code
Failure code
LD
indication
on master
unit
Indication
on wired
controller
(hex)
Failure code definition
Failure description
Remarks
20-0
14
Twi water inlet temp. failure
of the water heat exchanger
AD value is detected below 11
(open circuit) or above 1012
(short circuit) for 60 secs.
No handling of this abnormal
sensor when cooling mode is
operating.
Resumable
20-1
14
Two2 water outlet temp.
failure of the water heat
exchanger
21
15
Ambient temp. sensor Tao
failure
AD value is detected below
11(open circuit) or above
1012 (short circuit) for 60
secs.
Resumable
22-0
16
Suction temp. sensor Tsi
failure
