2
.
TROUBLESHOOTING
Fault
code
Fault
d
escription
Possible
r
eason
s
for
a
bnormality
How to
d
eal
w
ith
R
emarks
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 board 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 wiring of the
low pressure switch;
2. Replace the low pressure
switch;
3. Check the welding point to
confirm whether the unit leaks,
and 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.
45 IPM fault
There are many reasons for this
failure. You can check the driver
board fault LED to
further
analyze
the fault code of the drive board and
to learn about what leads to the fault
and how to operate it. Specific
information can be seen in table 5,
table 6.
See attached "analysis of the
driving board fault".
24
