Westinghouse WHU09DHA21S, Service Manual, Page: 39 / 97

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 connect ed loose ly .
2. The overload protector fail s .
3. The refrigerant is not enough;
4. The installation pipe is much
long er than the normal one , but
extra refrigerant is not add ed ;
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
T he high pressure
switch operat ion or
the unit is turn ed off
for high pressure
protection
1.
2.
The wiring of the high pressure
protector is connect ed loose ly ;
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 N OTE 3;
5. Please refer to N OTE 4.
Applied to
models with
high
pressure
switch or
pressure
sensor
15
T he low pressure
switch protection or
the unit is turn ed off
for low pressure
protection
1. The wiring of the low pressure
switch is connect ed loose ly ;
2. The low pressure switch fail s ;
3. The refrigerant is not enough;
4. The expansion valve fail s 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
O verload protection
in cooling mode
System overload Please refer to N OTE 3.
17
Discharge
temperature sensor
fault
1. The wiring of the discharge
tempe -r ature sensor is connect ed
loose ly ;
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 -
r ature sensor is connect ed loose ly ;
2. The suction temperature sensor
fail s ;
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 connect ed loose ly ;
2. The defrosting sensor fail s ;
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 a naly ze
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 see n in table 5,
table 6.
See attached "analysis of the
driving board fault".
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