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14.TROUBLESHOOTING
Fault
code
Fault description
Possible reasons for a
bnormality
How to deal with Remarks
13
Compressor overheat
protector device
1. The wiring of the overload
protector is connected loosely.
2. The overload protector fails .
3. The refrigerant is not enough;
4. The installation pipe is much
longer than the normal
one, but
extra refrigerant is not added ;
5. The expansion valve fails;
6. The outdoor control b
oard fails.
1. Reconnect the wiring of the
overload protector;
2. Replace the overload
protector;
3. Check the welding point of the
unit to confirm whether it is
leakage, and then recharge
the refrigerant;
4. Add the refrigerant;
5. Replace expansion valve;
6. Replace the outdoor control
board.
14
The high pressure
switch operation or
the unit is turned off
for high pressure
protection
1.
2.
The wiring of the high pressure
protector is connected loosely;
The high pressure protector
fails;
3.The outdoor control board is
abnormal;
4. Overload in cooling;
5. Overload in heating.
1.
2.
Reconnect the wiring of the
high pressure protector;
Replace the high pressure
protector;
3. Replace the outdoor control
board;
4. Please refer to NOTE 3;
5. Please refer to NOTE 4.
Applied to
models with
high
pressure
switch or
pressure
sensor
15
The low pressure
switch protection or
the unit is turned off
for low pressure
protection
1. The wiring of the low pressure
switch is connected loosely;
2. The low pressure switch fails;
3. The refrigerant is not enough;
4. The expansion valve fails in
heating mode;
5. The outdoor control board is
abnormal.
1. Reconnect the wiri
ng of the
low pressure switch;
2. Replace the low pressure
switch;
3. Check the welding point to
confirm whether the unit leaks,
an
d add some refrigerant;
4. Replace the expansion valve;
5. Replace the outdoor control
board.
Applied to
models with
low pressure
switch or
pressure
sensor
16
Overload protection
in cooling mode
System overload Please refer to NOTE 3.
17
Discharge
temperature sensor
fault
1.The wiring of the discharge
tempe-rature sensor is connected
loosely;
2. The discharge temperature
sensor fails;
3.The sampling circuit is abnormal.
1. Reconnect the wiring of the
discharge temperature sensor;
2. Replace the discharge
temperature sensor;
3. Replace the outdoor control
board.
18
AC voltage is
abnormal
1.The AC voltage>275V or <160V;
2.The AC voltage of sampling circuit
on the driver board is abnormal.
1. Normal protection, please
check the supply power;
2. Replace the driver board.
19
Suction temperature
sensor fault
1.The wiring of the suction tempe-
rature sensor is connected loosely;
2.The suction temperature sensor
fails;
3.The sampling circuit is abnormal.
1.Reconnect the wiring of the
suction temperature sensor;
2.Replace the suction
temperature sensor;
3.Replace the outdoor control
board.
22
The defrosting sensor
fault
1.The wiring of the defrosting sensor
is connected loosely;
2.The defrosting sensor fails;
3.The sampling circuit is abnormal.
1. Reconnect the wiring of the
defrosting sensor;
2. Replace the defrosting sensor;
3. Replace the outdoor control
board.
43
High Pressure sensor
fault
1. The wiring of the high-pressure
pressure sensor connect is loose;
2. The high-pressure pressure
sensor fails；
3. The sampling circuit of the high-
pressure pressure sensor
fails.
1. Reconnect the wiring of the
high-pressure pressure
sensor;
2. Replace the high-pressure
pressure sensor;
3. Replace the outdoor control
board.
54
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