19
Failure code
Inverter outdoor unit failure code
Digital tube
indication
on master
unit
Indication
on wired
controller
(hex)
Failure code
definition
Failure description
Remarks
20
20-0
Defrosting temp.
sensor Te failure
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
Resumable
20
20-1
Defrosting temp.
sensor Tc failure
21
21
Ambient temp.
sensor Ta failure
AD value is below 11(open circuit) or over 1012(short
circuit) for 60seconds, in defrosting and within 3 minutes
after defrosting, no alarm
Resumable
22
22
Suction temp.
sensor Ts failure
AD value is below 11(open circuit) or over 1012(short
circuit) for 60seconds, in defrosting and within 3 minutes
after defrosting, no alarm
Resumable
23
23
Discharging temp.
sensor Td failure
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
Resumable
26
26-0
Indoor
communication
failure
For continuous 200 cycles, can not find connected indoors
Resumable
26-1
26-1
For continuous 300seconds, the searched indoor quantity is
less than the set quantity.
26-2
26-2
For continuous 300seconds, the searched indoor quantity is
more than the set quantity.
30
30
High pressure
switch HPS failure
If disconnect for 50ms continuously, alarm. If alarm 3 times
in an hour, confirm the failure
Once
confirmation,
un-resumable
33
33
EEPROM failure
EEPROM failure
Once
confirmation,
un-resumable
34
34
Discharging temp.
too high protection
(Td)
Td≥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.
Once
confirmation,
un-resumable
35
35
4-way valve
reversing failure
If the compressor continuously runs 10 minutes without
4-way valve reversing failure, three minutes later, resume
automatically. If it occurs 3 times in an hour, confirm the
failure.
Once
confirmation,
un-resumable
43
43
Discharging temp.
sensor Td too low
protection
In normal operation, if Td<CT+10°C 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.
Once
confirmation,
un-resumable
46
46
Communication
with inverter board
failure
No communication within 30 seconds continuously
Resumable
49
49
Low pressure
switch LPS failure
If disconnect for 50ms continuously,alarm.If alarm 3 times in
an hour,confirm the failure
Once
confirmation,
un-resumable
