Failure Code - Haier MRV SII AU042FNEUA Service Manual

17. Failure Code

Inverter outdoor unit failure code
Digital tube
indication on Failure code definition
master unit
Defrosting temp.sensor Te
20
failure
Defrosting temp.sensor Tc
20-1
failure
Ambient temp.sensor Ta
21
failure
22 Suction temp.sensor Ts failure
Discharging temp.sensor Td
23
failure
26
26-1 Indoor communication failure
26-2
High pressure switch HPS
30
failure
33 EEPROM failure
Discharging temp.too high
34
protection (Td)
35 4-way valve reversing failure
Discharging temp. sensor Td
43
too low protection
Communication with inverter
46
board failure
Low pressure
49
switch LPS failure
Failure description
AD value is below 11(open circuit) or over 1012(short
circuit) for 60seconds, 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
AD value is below 11(open circuit) or over 1012(short
circuit) for 60seconds, in defrosting and within 3 minutes
after defrosting, no alarm
AD value is below 11(open circuit) or over 1012(short
circuit) for 60seconds, in defrosting and within 3 minutes
after defrosting, no alarm
After compressor is running for 5 minutes, AD value
is below 11(open circuit) or over 1012(short circuit) for
60seconds, in course of startup, defrosting and within 3
minutes after defrosting, no alarm
For continuous 200 cycles, can not find connected
indoors
For continuous 300seconds, the searched indoor
quantity is less than the set quantity.
For continuous 300seconds, the searched indoor
quantity is more than the set quantity.
If disconnect for 50ms continuously, alarm. If alarm 3
times in an hour, confirm the failure
EEPROM failure
Td≥239°F(115°C) at interval of 25msec for twice
continuously, and over the set value, then stop and
alarm; 3 minutes later, resume automatically. If it occurs
3 times in an hour, confirm the failure.
After 4-way valve is electrified for 3 minutes, if the below
conditions can be met for continous 10 seconds, that is
conversing successfully:
1. this outdoor compressor is running normally
2. Pd-Ps≥87PSI(0.6MPa), Otherwise, the system alarms
reversing failure.
In normal operation, if Td<CT+50°F
(10 ) for continuous 5 minutes, the unit stops and
alarms.2 minutes and 50 seconds later, resume
automatically. If it occurs 3 times in an hour, confirm the
failure. After fixed frequency compressor alarms, inverter
compressor will continue to run. If fixed frequency
compressor has been locked for 3 times, the unit will
stop and alarm.
No communication within 30 seconds continuously
If disconnect for 50ms continuously,alarm.If alarm 3
times in an hour,confirm the failure
47
Remarks
Resumable
Resumable
Resumable
Resumable
Resumable
Once
confirmation,
un-resumable
Once
confirmation,
un-resumable
Once
confirmation,
un-resumable
Once
confirmation,
un-resumable
Once
confirmation,
un-resumable
Resumable
Once
confirmation,
un-resumable