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Failure code
Inverter outdoor unit failure code
Digital tube
Indication
indication
on wired
on master
controller
unit
(hex)
20
20-0
20-1
20-1
21
21
22
22
23
23
26
26-0
26-1
26-1
26-2
26-2
28
28
29
29
30
30
33
33
34
34
35
35
43
43
Failure code
Failure description
definition
Defrosting temp.
AD value is below 11(open circuit) or over 1012(short circuit)
sensor Te failure
for 60seconds, in cooling mode, if the sensor is abnormal,
the unit does not deal with it, besides, in defrosting and
Defrosting temp.
within 3 minutes after defrosting, no alarm
sensor Tc failure
AD value is below 11(open circuit) or over 1012(short
Ambient temp.
circuit) for 60seconds, in defrosting and within 3 minutes
sensor Ta failure
after defrosting, no alarm
AD value is below 11(open circuit) or over 1012(short
Suction temp.
circuit) for 60seconds, in defrosting and within 3 minutes
sensor Ts failure
after defrosting, no alarm
After compressor is running for 5 minutes, AD value is below
Discharging temp.
11(open circuit) or over 1012(short circuit) for 60seconds,
sensor Td failure
in course of startup, defrosting and within 3 minutes after
defrosting, no alarm
For continuous 200 cycles, can not find connected indoors
Indoor
For continuous 300seconds, the searched indoor quantity is
communication
less than the set quantity.
failure
For continuous 300seconds, the searched indoor quantity is
more than the set quantity.
AD value is below 11(open circuit) or
High pressure
over 1012(short circuit) for 30seconds,
sensor Pd failure
in defrosting and within 3 minutes after
defrosting, no alarm
AD value is below 11(open circuit) or
Low pressure
over 1012(short circuit) for 30seconds,
sensor Ps failure
in defrosting and within 3 minutes after
defrosting, no alarm
High pressure
If disconnect for 50ms continuously, alarm. If alarm 3 times
switch HPS failure
in an hour, confirm the failure
EEPROM failure
EEPROM failure
Td≥239°F(115°C) at interval of 25msec for twice
Discharging temp.
continuously, and over the set value, then stop and alarm;
too high protection
3 minutes later, resume automatically. If it occurs 3 times in
(Td)
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
4-way valve
conversing successfully:
reversing failure
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
Discharging temp.
minutes and 50 seconds later, resume automatically. If it
sensor Td too low
occurs 3 times in an hour, confirm the failure. After fixed
protection
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.
19
Remarks
Resumable
Resumable
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
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