Fault
code Fault Description Possible Reasons for Abnormality
How to Deal With
Remarks
14
The high pressure
switch operates or
the unit stops 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 the high
pressure protector;
Replace the high pressure
protector;
3. Replace the outdoor control
board;
4. Please refer to the NOTE 3;
5. Please refer to the NOTE 4.
Applied to
models
with high
pressure
switch or
pressure
sensor
15
The low pressure
switch protection or
the unit turn 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 then
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
Please refer to the NOTE3.
17
Discharge
temperature
sensor fault
1.The wiring of the discharge
temperature 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.
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".
46
IPM and control
board
communication
fault
1. The cable between the control
board and the driver board is
connected loosely;
2. The cable between the control
board and the driver board
fails;
3. The driver board fails;
4. The control board fails.
1. Reconnect the cable between the
control board and the driver
board;
2. Replace the communication cable
between the control board and
the driver board;
3. Replace the driver board;
4. Replace the control board.
47
Discharge
temperature too
high fault
1.
2.
The refrigerant of the unit is not
enough;
The refrigerant of the unit is not
enough due to adding the length
of the installation pipe;
3. Throttling service fails;
4. The outdoor ambient temperature
is too high.
1. Check the welding point to confirm
whether the unit has leakage
point, and then add some
refrigerant.
2. Add some refrigerant referring to
the installation user manual;
3. Replace the throttling
service (such as capillary,
expansion valve)
4. Normal protection.
48
the outdoor DC fan
motor fault
(upper fan motor)
1.The wiring of the up DC fan motor
is connected loosely;
2. The cord of the up DC fan motor
fails;
3. The up DC fan motor fails;
4. The drive circuit of the up DC fan
motor fails;
5. The outdoor fan has been
blocked.
1. Reconnect the wiring of the up DC
fan motor;
2. Replace the up DC fan motor;
3. Replace the up DC fan motor;
4. Replace the driver board of the
fan motor;
5. Check the outdoor fan and ensure
the outdoor fan can run normally.
Overload protection
in cooling mode
System overloads.
15. TROUBLESHOOTING
54
