Indoor Fault Code - Friedrich FPHMR18A3A Service Manual

Indoor Fault Code

Fault
Fault Description
code
Indoor EEPROM
74
Data 2 error
WiFi Ready to Pair
77
Indoor ambient
81 Temperature
Sensor Fault
E vaporator Middle
83 Temperature
Sensor Fault
C ommunication
between main control
board &Wiring
FE
remote controller
(254)
Fault (display on
wiring remote
controller)
C ommunication
between main
control board
ER
&display board Fault
(displays on display
board)
79
TROUBLESHOOTING
Possible Reason of Abnormalit y
EE in MCU is failure, the unit
run, but the function user has set
is ineffective.
Switch accidently depressed
1. The cable of the room
temperature sensor connect
loose;
2. The room temperature sensor
is failure;
3. The sampling circuit is abnormally
1.The cable of the coil temperature
sensor of the evaporator is
failure;
2. The coil temperature sensor of
the evaporator is failure;
3. The sampling circuit is abnormally
1. The wiring between the
wiring controller to the indoor
control board connect loose;
2. The sequence of the wiring
between the wiring controller
to the indoor control board
is wrong;
3. The wiring between the
wiring controller to the indoor
control board is failure;
4.The wiring controller is failure;
5. The indoor control board
is abnormally .
1.The wiring between the display
board to the indoor control
board connect loose;
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
is failure;
4. The display board is failure;
5. The indoor control board is
failure.
How to Deal With
can
Replace EE data in MCU.
Cycle unit power o and then
on again
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 wiring controller to the
indoor control board;
2. Replace the wiring between
the wiring controller to the
indoor control board;
3. Replace the wiring between
the wiring controller to the
indoor control board;
4. Replace the wiring controller;
5. Replace the indoor control
Board .
1. Reconnect the 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.
Re marks