Friedrich FPHFC36A3B Wi-Fi Service & Parts Manual page 104

Outdoor Fault Code
Fault
Fault escription
code
Compressor overheat
13
protector device
The high pressure
switch operat ion or
14 the unit is turned off
for high pressure
protection
The low pressure
switch protection or
15
the unit is turned off
for low pressure
protection
O verload protec tion
16
in cooli ng mode
Discharge
17 temperature sensor
fault
AC voltage is
18
abnormal
Suction temperature
19
sensor fault
The defrosting sensor
22
fault
45 IPM fault
104
TROUBLESHOOTING
Possible reasons for bnormality
1. The wiring of the overload
protector is conne cted loose ly.
2. The overload protector fails .
3. The refrigerant is not enough;
4. The installation pipe is much
longer than the norma l one , but
extra refrigerant is not add ed ;
5. The expansi on valve fails;
6. The outdo or control board fails.
1. The wiring of the high pressure
protector is conne cted loose ly;
2. The high pressure protector
fails;
3.The outdoor control board is
abnormal;
4. Overload in cooling;
5. Overload in heating.
1. The wiring of the low pressure
switch is connect ed loose ly;
2. The low pressure switch fails;
3. The refrigerant is not enough;
4. The expansi on valve fails in
heati ng mode;
5. The outdoor control board is
abnormal.
System overload
1.The wiring of the discharge
tempe -rature se nsor is connect ed
loose ly;
2. The discharge temperature
sensor fails;
3.The sampling circuit is abnormal.
1.The AC voltage>27 5V or <160V ;
2.The AC voltage of sampling circuit
on the driver board is abnormal .
1.The wiring of the suction tempe -
rature se nsor is connect ed loose ly;
2.The suction temperature se nsor
fails;
3.The sampling circuit is abnormal .
1.The wiring of the defrosting sensor
is conn ected loose ly;
2.The defrosting sensor fails;
3.The sampling circuit is abnormal .
There are many reasons for this
failure. You can check the driver
board fault LED to further analyze
the fault code of the drive board and
to learn about what leads to the fault
and how to operate it . Specific
information can be seen in table 5,
table 6.
How to eal ith
1. Reconnect the wiring of the
overload protector;
2. Replace the overload
protector;
3. Check the welding point of the
unit to confirm whether it is
leakage, and then recharge
the refrigerant;
4. Add the refrigerant;
5. Replace expansion valve;
6. Replace the outdoor control
board.
1. Reco nnect the wiring of the
high pressure protector;
2. Replace the high pressure
protector;
3. Repl ace the outdo or control
board;
4. Please refer to NOTE 3;
5. Please refer to NOTE 4.
1. Recon nect the wiring of the
low pressu re switch;
2. Repl ace the low pressure
switch;
3. Check the welding point to
confirm whethe r the unit leaks ,
and add some refrigerant;
4. Repl ace the expansio n valve;
5. Repl ace the outdo or control
board.
Pleas e refer to NOTE 3.
1. Reco nnect the wiring of the
discharge temperature sensor;
2. Replace the discharge
temperature sensor;
3. Replace the outdoor control
board.
1. Normal protection, please
check the supply power;
2. Repl ace the driver board.
1.Reconnect the wiring of the
suction temperature sensor;
2.Replace the suction
temperature sensor;
3.Replace the outdoor control
board.
1. Reconnect the wiring of the
defrosting sensor;
2. Replace the def rosting sensor;
3. Replace the outdoor control
board.
See attached "analysis of the
driving board fault".
R
Applied to
models with
high
pressure
switch or
pressure
sensor
Applied to
models with
low pressure
switch or
pressure
sensor