Westinghouse WHU09DHA21S Service Manual page 41

The following is the fault code table of indoor unit.
Fault
Fault description
code
51 Drainage protection
Mode conflict fault
55
Communication
between Indoor
64
& Outdoor unit
Fault
Indoor unit zero
71
check fault
72 Indoor fan motor fault
Indoor EEPROM
73 Data
1 fault
Table 2 Indoor fault code
Possible reasons for abnormality
1. The water level of the drain
pan exceed safe level;
2. The cable of the water level
switch is connected loosely;
3.The water level switch fails;
4.The control board fails.
The user set the conflicting mode for
more than two indoor units.
1. The indoor unit and the outdoor
unit are not connected properly;
2. The communication cable is
connected loosely;
3. The communication cable
between the indoor unit and the
outdoor unit is failure or the cable
between the indoor control board
to terminal fails or the cable
between the outdoor control board
to the terminal fails;
4. The indoor control board fails;
5. The outdoor control board fails.
1. The motor wire is loosen;
2. The motor connection is open;
3. The motor fails;
4. Control board fails.
5. Indoor fan is baffled.
1. The cable of the indoor fan
motor is connected loosely;
2. The cable of the indoor fan
motor fails;
3. The indoor fan motor fails;
4. The indoor control board fails.
1. Indoor EE components fails;
2. The control circuit of the EE
components fails;
3. The EE components has been
inserted in opposite direction.
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How to deal with
1.1 Check whether there is
something blocking the
drain hose or the height of
the drain hose is too high;
1.2 Check the water pump and
replace the water pump
if the water pump fails;
2. Reconnect the cable of the
water level switch referring
to the wiring diagram;
3. Replace the water level
switch;
4. Replace the control board.
Reset the operation mode for the
indoor unit, for with one outdoor
unit, the user should avoid setting
the conflicting operation mode
with the indoor units.
1. Reconnect the connection
cable referring to the indoor
and outdoor wiring diagram;
2. Reconnect the
communication cable
referring to the indoor and
outdoor wiring diagram;
3. Replace the communication
cable referring to the indoor
and outdoor wiring diagram;
4. Replace the indoor control
board;
5. Replace the outdoor control
board.
1.Replace the motor wire and
make sure the wire connect
is well;
2. Replace the motor wire;
3. Change the motor;
4. Change the indoor control
board;
5. Check and elimination of
fan motor rotation.
1. Reconnect the cable of the
fan motor;
2. Replace the cable of the fan
motor;
3. Replace the fan motor;
4. Replace the indoor control
board;
5. Check the indoor fan and
ensure the indoor fan can
run normally.
1. Replace the EE components;
2. Replace the indoor control
board;
3. Reassembly the EE
components of the indoor
control board.
Remarks