Friedrich FPHMR18A3A Service Manual page 88

Outdoor Fault Codes
Fault code Fault description
ER "Communication between
main control board
& display board Fault
(displays on display
board)"
88
TROUBLESHOOTING
Possible reasons for
abnormality
"1.The wiring between the
display board to the indoor
control board is connected
loosely;
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 fails;
4.The display board fails;
5.The indoor control board
fails."
How to deal with
"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."
Remarks
THIS CODE IS ONLY
APPLICABLE TO
MODELS PRODUCED
IN THE YEAR 2021 OR
LATER .THIS CODE
CAN APPEAR IF THE
CIRCUIT BOARDS ARE
REPLACED ON OLDER
MODELS.