Friedrich FPHMR18A3A Service And Parts Manual page 193

18K, 24k and 36k outdoor Fault Codes
13 .2 Fa ult codes
The following is the fault code table of outdoor.
Fault
Fault D escription
code
Outdoor ambient
1 temperature sensor
fault
Outdoor coil
2 temperature sensor
fault
The unit over-current
3
turn off fault
4 EEprom Data error
Cooling freezing
protection (the indoor
coil temperature is too
5 low) or heating
overload (indoor coil
temperature is too
high)
The communication
fault between the
7
indoor unit and
outdoor unit
193
TROUBLESHOOTING
Sheet 1 Outdoor Fault Code
Possible R eason of Abnormality
1.The outdoor ambient temperature
sensor connect loose;
2.The outdoor ambient temperature
sensor is failure;
3.The sampling circuit is failure
1.The outdoor coil temperature
sensor connect loose;
2.The outdoor coil temperature
sensor is failure;
3.The sampling circuit is failure
1. Control board current sampling
circuit is failure;
2. The current is over high because
of the supply voltage is too low
3. The compressor is blocked
4. Overload in cooling mode
5. Overload in heating mode
1.EE components is failure;
2.EE components control circuit
failure;
3.EE components insert incorrect
1.The indoor unit can not blow air
normally;
2.The room temperature is too low in
cooling mode or the room
temperature is too high in heating;
3.The filter is dirty;
4.The duct resistance is too high to
result in low air flow;
5.The setting fan speed is too low;
6. The indoor unit is not standard
installed, air inlet is too near with
air outlet .
1. The connection cable connect
wrong between the indoor unit and
outdoor unit;
2. The communication cable connect
loose;
3.The communication cable is fault;
4.The indoor control board is fault;
5.The outdoor control board is
fault;
6.Communication circuit fuse open;
7.The specification of
communication cable is incorrect.
How to D eal With
1.Reconnect the outdoor
ambient temperature sensor;
2.Replace the outdoor ambient
temperature sensor
components;
3.Replace the outdoor control
board components.
1.Reconnect the outdoor coil
temperature sensor;
2.Replace the outdoor coil
temperature sensor
components;
3.Replace the outdoor control
board components.
1. Replace the electrical control
board components;
2. Normally protection
3. Replace the compressor
4. Please see the Note 3
5. Please see the Note 4
1.Replace the EE components;
2.Replace the outdoor control
board components;
3.Reassembly the EE
components.
1.Check the indoor fan, indoor
fan motor and evaporator
whether normally;
2. Normally protection;
3.Clean the filter;
4.Check the volume control
valve, duct length etc.;
5.Set the speed with high speed;
6.Reinstall the indoor unit refer to
the user manual to change the
distance between the indoor
unit and the wall or ceiling.
1. Reconnect the connection
cable refer to the wiring
diagram;
2. Reconnect the communication
cable;
3. Replace the communication
cable;
4.Replace the indoor control
board;
5.Replace the outdoor control
board;
6.Check the communication
circuit, adjust the DIP switch
and the short-circuit fuse.
7.Choose suitable
communication cable refer to
the user manual
R E MAR KS