Friedrich FPHMR18A3A Service Manual page 87

Outdoor Fault Codes
Fault code Fault description
81 Indoor ambient
Temperature Sensor Fault
83 Evaporator Middle
Temperature Sensor Fault
91 "The unit turn off due to
the IPM
board over heating fault"
96 Lacking of refrigerant
97 4‑way valve commutation
failure fault
FE (254) Communication between
main control board
& Wired controller
Fault (display on wired
controller)
87
TROUBLESHOOTING
Possible reasons for
abnormality
"1. The cable of the room
temperature sensor is connect
loosely;
2. The room temperature
sensor fails;
3. The sampling circuit is
abnormal."
"1.The cable of the coil
temperature sensor of the
evaporator fails;
2.The coil temperature sensor
of the evaporator fails;
3.The sampling circuit is
abnormal."
"1. The outdoor ambient is too
high;
2. The speed of the out fan
motor is too low if the fan
motor is AC fan motor;
3.The outdoor unit has been
installed without standard;
4.The supply power is too low."
The refrigerant of the unit is
not enough.
"1.The connecting wiring of the
4‑ way valve coil is loose;
2.The 4‑way valve coil fails;
3.The 4‑way valve fails;
4.The driver board of the
4‑way valve fails."
"1. The wired controller and
the indoor control board are
connected loosely.
2. The sequence of the wiring
between the wired controller
to the indoor control board is
wrong;
3. The wiring between the
wired controller to the indoor
control board fails;
4. The wired controller is fails;
5. The indoor control board is
abnormal."
How to deal with
"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. Normally protection;
2. Check the fan capacitor,
and replace the fan
capacitor if it is failure;
3. Reinstalled the outdoor
unit refer to the installation
user manual;
4.Normally protection."
Discharge the refrigerant
and charge the refrigerant
referring to the rating label.
"1. Reconnect the wiring of
the 4‑way valve;
2. Replace the 4‑way valve
coil;
3. Replace the 4‑way valve;
4.Replace the driver board
of the
4‑way valve."
"1.Reconnect the wiring
between the wired
controller to the indoor
control board;
2. Replace the wiring
between the wired
controller to the indoor
control board;
3. Replace the wiring
between the wired
controller to the indoor
control board;
4. Replace the wired
controller;
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.
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.
THIS CODE IS ONLY
APPLICABLE TO
MODELS PRODUCED UP
TO AND INCLUDING THE
YEAR 2020.
If continue to see this
code after confirming
charge call Technical
Assistance Center for
additional help.
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.