Hisense 2AMW-42U4RRA, Technical & Service Manual, Page: 65 / 80

14.TROUBLESHOOTING
Fault
Code
Fault Description Possible Reason of Abnormality How to Deal With Remarks
12 voltage absent phase
1. Three-phase power is
abnormal;
2. The outdoor wiring connects
wrong;
3. The outdoor control board is
failure.
1.
Normally protection
2.
Check the wiring connection
refer to the wiring diagram;
3.
Replace the outdoor control
board.
13
Compressor overheat
protector device
1. The wiring of the overload
protector connection is 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.
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.
Com-
pressor
overheat
protector
device
14
High pressure switch
operate or the unit turn
off for high pressure
protection
1. The wiring of the high pressure
protector connect loose;
2. The high pressure protector is
failure;
3. The outdoor control board is
abnormal;
4. Overload in cooling;
5. Overload in heating.
1. Reconnect the wiring the high
pressure protector;
2. 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.
Valid for
models
with high
pressure
switch or
pressure
sensor
15
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.
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.
For
models
with low
pressure
switch or
pressure
sensor
16
overload protection in
cooling mode
System overload Please refer to the Note 3.
17
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.
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
abnormally.
1. Normally protection, please
check the supply power;
2. Replace the driver board.
19
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.
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 connect loose;
2. The defrosting sensor is failure;
3. The sampling circuit is
abnormally
1. Reconnect the wiring of the
defrosting sensor;
2. Replace the defrosting sensor;
3. Replace the outdoor control
board.
61