Westinghouse WHU09CTA21S, Service Manual, Page: 37 / 90

Table 1 Outdoor fault code
Fault
code
Fault d escription Possible
r
eason
s for a
bnormality How to d eal w ith R emarks
1
Outdoor ambient
temperature sensor
fault
1. The outdoor ambient temperature
sensor is connected loose ly ;
2. The outdoor ambient temperature
sensor fails to work ;
3. The sampling circuit fails.
1.Reconnect the outdoor
ambient temperature sensor;
2.Replace the outdoor ambient
temperature sensor
components;
3.Replace the outdoor control
board components.
2
Outdoor coil
temperature sensor
fault
1. The outdoor coil temperature
sensor is connected loosely ;
2. The outdoor coil temperature
sensor fails to work ;
3. The sampling circuit fails.
1.Reconnect the outdoor coil
temperature sensor;
2.Replace the outdoor coil
temperature sensor
components;
3.Replace the outdoor control
board components.
3 The unit over-current
turn off fault
1. Control board current sampling
circuit fail s ;
2. The current is over high because
the supply voltage is too low ;
3. The compressor is blocked ;
4. Overload in cooling mode ;
5. Overload in heating mode .
1. Replace the electrical control
board components;
2. Normal protection ;
3. Replace the compressor ;
4. Please see N OTE 3 ;
5. Please see N OTE 4 .
4 EEprom Data error
1. EE components fail s ;
2. EE components control circuit
fail s ;
3. EE components are insert ed
incorrect ly.
1.Replace the EE components;
2.Replace the outdoor control
board components;
3.Reassembl e the EE
components.
5
Cooling freezing
protection (the indoor
coil temperature is too
low) or heating
overload (indoor coil
temperature is too
high)
1. The indoor unit can not blow air
normally;
2. The room temperature is too low in
cooling mode or the room
temperature is too high in heating;
3. The filter is dirty;
4. The duct resistance is too high to
result in low air flow;
5. The setting fan speed is too low;
6. The indoor unit is not installed in
accordance with the installation
standards , and the air inlet is too
close to the air outlet .
1. Check whether the indoor fan,
indoor fan motor and
evaporator work normally;
2. Normal protection;
3. Clean the filter;
4. Check the volume control
valve, duct length etc.;
5. Set the speed with high speed;
6. Reinstall the indoor unit
refer ring to the user manual to
change the distance between
the indoor unit and the wall or
ceiling.
7
The communication
fault between the
indoor unit and
outdoor unit
1.
2.
The connection cable is connect ed
improperly between the indoor unit
and outdoor unit;
The communication cable is
connect ed loose ly ;
3. The communication cable fails ;
4. The indoor control board fails ;
5. The outdoor control board fails ;
6. Communication circuit fuse open;
7. The specification of
communication cable is incorrect.
1.
2.
3.
Reconnect the connection
cable refer ring to the wiring
diagram;
Reconnect the communication
cable;
Replace the communication
cable;
4. Replace the indoor control
board;
5. Replace the outdoor control
board;
6. Check the communication
circuit, adjust the DIP switch
and the short-circuit fuse.
7. Choose suitable
communication cable
refer ring to the user manual
The following is the fault code table of outdoor units .
Fault codes
- 3
6
-