Westinghouse WHU09CTA21S, Service Manual, Page: 41 / 90

Fault
code
Fault description
Possible
r
eason
s
f
or a
bnormality
How to
d
eal
w
ith Remarks
74 Indoor EEPROM
Data 2 fault
EE in MCU fai ls , the unit
can run, but the function
user has set is ineffective.
Replace EE data in MCU.
81
Indoor ambient
Temperature
Sensor Fault
1. The cable of the room
temperature sensor is connect ed
loose ly ;
2. The room temperature sensor
fail s ;
3. The sampling circuit is abnormal .
1. Reconnect the cable of the
room temperature sensor;
2. Replace the room temperature
sensor;
3. Replace the indoor control
board.
83
Evaporator Middle
Temperature
Sensor Fault
1. The cable of the coil temperature
sensor of the evaporator fail s ;
2. The coil temperature sensor of
the evaporator fail s ;
3. The sampling circuit is abnormal .
1. Reconnect the cable of the
coil temperature sensor of the
evaporator;
2. Replace the coil
temperature sensor of the
evaporator;
3. Replace the indoor
control board.
FE
(254)
Communication
between main
control board &
Wir ed controller
Fault (display on
wir ed controller)
1. The wir ed controller and the
indoor control board are
connect ed loose ly.
2. The sequence of the wiring
between the wir ed controller
to the indoor control board is
wrong;
3. The wiring between the
wir ed controller to the indoor
control board fail s ;
4. The wir ed controller is fai ls ;
5. The indoor control board
is abnormal.
1.
2.
Reconnect the wiring between
the wir ed controller to the
indoor control board;
Replace the wiring between
the wir ed controller to the
indoor control board;
3. Replace the wiring between
the wir ed controller to the
indoor control board;
4. Replace the wir ed controller;
5. Replace the indoor control
b oard.
ER
Communication
between main
control board
& display board
Fault (displays on
display board)
1. The wiring between the display
board to the indoor control
board is connect ed loose ly ;
2. The sequence of the wiring
between the display board to the
indoor control board is wrong;
3. The wiring between the display
board to the indoor control
board fail s ;
4. The display board fail s ;
5. The indoor control board fail s .
1. Reconnect the wiring
between the display board
to the indoor control board;
2. Replace the wiring between
the display board to the
indoor control board;
3. Replace the wiring between
the display board to the
indoor control board;
4. Replace the display board;
5. Replace the indoor control
board.
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