Service and Parts Manual (2019, 2020, 2021, 2022)

107 PB
TROUBLESHOOTING
Indoor Unit Fault Codes
Fault
code
Fault D escription Possible R eason of Abnormality RE MAR KS How to Deal With
12 voltage absent phase
refer to the wiring diagram;
1. Normally protection
2. Check the wiring connection
Three-phase power is abnormal;
The outdoor wiring connect wrong;
The outdoor control board is
failure.
board
3. Replace the outdoor control
three-phase
Application of
models
power supply
13
Compressor overheat
protector device
1. The wiring of the overload
protector connect loose.
2. The overload protector is failure .
3. The refrigerant is not enough;
4. The installation pipe is too long
than normal, but not add the
enough refrigerant;
5. The expansion valve is failure;
6. The outdoor control board is
failure
14
1.
2.
the high pressure
switch operate or the
unit turn off for high
pressure
protection
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.
1.The wiring of the high pressure
protector connect loose;
The high pressure protector is
failure;
2.
3.The outdoor control board is
abnormal;
4. Overload in cooling;
5. Overload in heating.
Replace the high pressure
protector;
Reconnect the wiring the high
pressure protector;
Applied to
high
pressure
models with
switch or
pressure
sensor
3. Replace the outdoor control
board;
4. Please refer to the Note 3;
5. Please refer to the Note 4.
15
the low pressure
switch protection or
the unit turn off for low
pressure protection
1. The wiring of the low pressure
switch connect loose;
2. The low pressure switch is failure;
3.The refrigerant is not enough;
4.The expansion valve failure in
heating mode;
5.The outdoor control board is
abnormal.
Applied to
models with
low pressure
switch or
pressure
sensor
16 System overload
overload protection in
cooling mode
Please refer to the Note 3.
17
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 is
leakage, and then
add some refrigerant;
4. Replace the expansion valve;
5. Replace the outdoor control
board.
Discharge
temperature sensor
fault
1.The wiring of the discharge
temperature sensor connect loose;
2.The discharge temperature sensor
is failure;
3.The sampling circuit is abnormal.
18
AC voltage is
abnormal
1.Reconnect the wiring of the
discharge temperature sensor;
2.Replace the discharge
temperature sensor;
3.Replace the outdoor control
board.
2.The AC voltage of sampling circuit
on the driver board is abnormally
19
1. Normally protection, please
check the supply power;
2. Replace the driver board.
Suction temperature
sensor fault
1.The wiring of the suction
temperature sensor connect
loose;
2. The suction temperature sensor is
failure;
3. The sampling circuit is abnormally
22
The defrosting sensor
fault
1.Reconnect the wiring of the
suction temperature sensor;
2.Replace the suction
temperature sensor;
3.Replace the outdoor control
board.
1.The wiring of the defrosting sensor
connect loose;
2.The defrosting sensor is failure;
3.The sampling circuit is abnormally
23
1. Reconnect the wiring of the
defrosting sensor;
2. Replace the def rosting sensor;
3. Replace the outdoor control
board.
Expansion valve A
tube (thin) sensor
fault
1. The wiring of the sensor for the
expansion valve A (thin tube)
connect loose;
2. The sensor for the expansion
A(thin tube) is failure;
3. The sampling circuit is
abnormally
1. Reconnect the wiring of the
sensor for the expansion valve
A (thin tube);
2. Replace the sensor for the
expansion valve A (thin tube);
3. Replace the ou tdoor control
board.