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20
Failure code
Inverter outdoor unit failure code
Digital tube
indication
on master
unit
Indication
on wired
controller
(hex)
Failure code
denition
Failure description Remarks
20 20-0
Defrosting temp
sensor Te1 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 operate in defrosting and within 3 minutes after
defrosting, no alarm
Resumable
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 nd 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.
28 28
High pressure
sensor Pd failure
AD value is below 11(open circuit) or over 1012(short
circuit) for 30seconds, in defrosting and within 3 minutes
after defrosting, no alarm
Resumable
29 1D
Low pressure
sensor Ps failure
AD value is below 11(open circuit) or over 1012(short
circuit) for 30seconds, in defrosting and within 3 minutes
after defrosting, no alarm
Resumable
30 30
High pressure
switch HPS failure
If disconnect for 50ms continuously, alarm. If alarm 3 times
in an hour, conrm the failure
Once
conrmation,
un-resumable
33 33 EEPROM failure EEPROM failure
Once
conrmation,
un-resumable
34 34
Discharging temp.
too high protection
(Td)
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, conrm the failure.
Once
conrmation,
un-resumable
35 35
4-way valve
reversing failure
After 4-way valve is electried 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.
Once
conrmation,
un-resumable
39-0 39-0
Low pressure
sensor Ps too low
protection
After compressor is running (except for residual operation),
if in cooling, Ps<0.05Mpa; in heating, Ps<0.03Mpa; in oil
return, Ps<0.03Mpa for continuous 5 minutes, alarm and
stop. 2 minutes and 50 seconds later, resume automatically,
if it occurs 3 times in an hour, conrm the failure.
Once
conrmation,
un-resumable
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