Friedrich FPHMR18A3A Service Manual page 82

Outdoor Fault Codes
Fault code Fault description
1 Outdoor ambient
temperature sensor fault
2 Outdoor coil temperature
sensor fault
3 The unit over‑current turn
off fault
4 EEprom Data error
5 Cooling freezing
protection (the indoor coil
temperature is too low) or
heating overload (indoor
coil temperature is too
high)
82
TROUBLESHOOTING
Possible reasons for
abnormality
"1.The outdoor ambient
temperature sensor is
connected loosely;
2.The outdoor ambient
temperature sensor fails to
work;
3.The sampling circuit fails."
"1.The outdoor coil
temperature sensor is
connected loosely;
2.The outdoor coil
temperature sensor fails to
work; 3.The sampling circuit
fails."
"1. Control board current
sampling
circuit fails;
2. The current is over high
because the supply voltage is
too low;
3. The compressor is blocked;
4. Overload in cooling mode;
5. Overload in heating mode."
"1.EE components fails;
2.EE components control
circuit fails;
3.EE components are inserted
incorrectly."
"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
installed in accordance with
the installation
standards, and the air inlet
is too
close to the air outlet ."
How to deal 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 whether the indoor
fan, indoor fan motor and
evaporator work normally;
2.Normal 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
referring to the user manual
to change the distance
between the indoor unit and
the wall or ceiling."
Remarks