Friedrich FPHFC36A3B Wi-Fi Service & Parts Manual page 108

Indoor Unit Fault Codes
Fault
Fault description
code
Indoor EEPROM
74
Data 2 fault
Indoor ambient
81 Temperature
Sensor Fault
E vaporator Middle
83 Temperature
Sensor Fault
C ommunication
between main
control boar d &
FE
Wired controller
(254)
Fault (display on
wired controller)
C ommunication
between main
control board
ER
& display board
Fault (displays on
display board)
108
TROUBLESHOOTING
Possible reason s f or bnormality
EE in MCU fails, the unit
can run, but the function
user has set is ineffective.
1. The cabl e of the room
temperatur e sensor is connect ed
loose ly;
2. The room temperatur e sensor
fails;
3. The sampling circuit is abnormal .
1.The cabl e of the coil temperature
sensor of the evaporator fails;
2.The coil temperatur e sensor of
the evaporator fails;
3.The sampli ng circuit is abnormal .
1. The wired controller and the
indoor control boar d are
connect ed loose ly.
2. The sequenc e of the wiring
between the wired controller
to the indoor control board is
wrong;
3. The wiring betwee n the
wired controller to the indoor
control boar d fails;
4. The wired controller is fails;
5. The indoor control board
is abnormal .
1.The wiring betwee n the display
boar d to the indoor control
board is connect ed loose ly;
2.The sequenc e of the wiring
between the display board to the
indoor control boar d is wrong;
3.The wiring between the display
boar d to the indoor control
board fails;
4.The display boar d fails;
5.The indoor control boar d fails.
How to eal ith
Replace EE data in MCU.
1. Reconnect the cable of the
room temperature sensor;
2. Replace the room temperature
sensor;
3. Replace the indoor control
board.
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.
1. Reconnect the wiring between
the wired controller to the
indoor control board;
2. Replac e the wiring between
the wired controller to the
indoor control board;
3. Replac e the wiring between
the wired controller to the
indoor control board;
4. Replac e the wired controller;
5. Replac e the indoor control
boa rd.
1. Reconnect the wiring
between the display boar d
to the indoor control board;
2. Replac e the wiring between
the display boar d to the
indoor control board;
3. Replac e the wiring between
the display boar d to the
indoor control board;
4. Replac e the display board;
5. Replac e the indoor control
board.
Re marks