Friedrich FPHMR18A3A Service Manual page 86

Outdoor Fault Codes
Fault code Fault description
47 Too high discharge
temperature fault
48 The outdoor DC fan motor
fault (upper fan motor)
49 "the outdoor DC fan motor
fault
(down fan motor)"
50 Expansion valve E (gas
pipe) sensor fault
53 Expansion valve D (liquid)
pipe sensor fault
74 Indoor EEPROM Data 2
fault
86
TROUBLESHOOTING
Possible reasons for
abnormality
"1. The refrigerant of the unit
is not enough;
2.The refrigerant of the unit
is not enough due to that the
installation pipe is longer.
3.Throttling service fails;
4.The outdoor ambient
temperature is too high."
"1.The connecting wiring of the
up DC fan motor is loose;
2.The cord of the upper DC fan
motor fails;
3.The upper DC fan motor fails;
4.The drive circuit of the upper
DC fan motor fails;
5.The outdoor fan has been
blocked."
"1. The wiring of the down DC
fan motor connect loose;
2. The cord of the down DC fan
motor is failure;
3. The down DC fan motor is
failure;
4. The drive circuit of the down
DC fan motor is failure;
5. The outdoor fan has been
blocked."
"1. The wiring of the sensor
for the expansion valve E (gas
pipe) is connected loosely;
2. The sensor of the expansion
valve E (gas pipe) fails;
3. The sampling circuit fails."
"1.The wiring of the sensor for
the expansion valve D (liquid
pipe) is connected loosely;
2.The sensor of the expansion
valve D (liquid pipe) fails;
3.The sampling circuit fails."
EE in MCU is fails, the unit
can run, but the function user
has set is ineffective.
How to deal with
"1.Check the welding point
to confirm whether the unit
has leakage point and then
add some refrigerant.
2.Add some refrigerant
referring to the installation
user manual;
3.Replace the throttling
service (such as capillary
expansion valve)
4.Normal protection."
"1.Reconnect the wiring of
the up DC fan motor;
2.Replace the upper DC fan
motor;
3.Replace the upper DC fan
motor;
4.Replace the driver board
of the fan motor;
5.Check the outdoor fan and
ensure the outdoor fan can
run normally."
"1. Reconnect the wiring of
the down DC fan motor;
2. Replace the down DC fan
motor;
3. Replace the down DC fan
motor;
4. Replace the driver board
of the fan motor;
5. Check the outdoor fan
and ensure the outdoor fan
can run
normally."
"1. Reconnect the wiring of
the sensor for the expansion
valve E (gas pipe);
2. Replace the sensor for
the expansion valve E (gas
pipe);
3. Replace the outdoor
control board."
"1. Reconnect the wiring of
the sensor for the expansion
valve D (liquid pipe);
2. Replace the sensor for the
expansion valve D (liquid
pipe);
3. Replace the outdoor
control board."
Replace EE data in MCU.
Remarks
THIS CODE IS ONLY
APPLICABLE TO
MODELS PRODUCED UP
TO AND INCLUDING THE
YEAR 2020.
THIS CODE IS ONLY
APPLICABLE TO THE
42K MULTIZONE
OUTDOOR UNIT.
THIS CODE IS ONLY
APPLICABLE TO THE
42K MULTIZONE
OUTDOOR UNIT.
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.