Troubleshooting; Diagnostic Codes; Outdoor Unit - Friedrich FPHW091A Service & Parts Manual

Diagnostic Codes

Outdoor Unit

When the unit has the following trouble and the compressor stops running, The LED of outdoor control board will show the
error sequence automatically:
Diag Outdoor Failure Description
Code
Mark description: the lights flash every second for the following faults
Outdoor coil temperature sensor
faulted
Compressor exhaust temperature
sensor faulted
Communication failure between the
indoor unit and outdoor unit
Current overload protection
Maximum current protection
Communication trouble between
outdoor unit and driver
Outdoor EEPROM faulted
Compressor exhaust temperature
too high protection
Outdoor ambient temperature
sensor faulted
Compressor shell temperature too
high protection
Anti‑freeze protection with cooling
or overload protection with heating in
indoor unit
56

TROUBLESHOOTING

LED1 LED2
ON OFF
ON OFF
OFF OFF
ON BLINKS
ON BLINKS
OFF ON
ON ON
OFF BLINKS
ON ON
OFF ON
OFF BLINKS
LED3 the root cause my be one of the following
ON a.the outdoor coil sensor connector loose.
b.the outdoor coil temperature sensor failed.
c.the outdoor control board failed.
OFF a.the compressor exhaust temperature sensor
connector loose.
b.the compressor exhaust temperature sensor
failed.
c.the outdoor control board failed.
BLINKS a.the communication cable connector loose.
b.the communication cable failed.
c.the connectorion between the filter board and the
outdoor control board is incorrect or loose.
d.the connectorion between the filter board and
the terminal is incorrect or loose.
e.the indoor control board failed.
f.the PFC board failed.
g.the power board failed.
h.the outdoor control board failed.
OFF a.the fan motor run abnormally.
b.the condensor and evaporator is dirty.
c.the air inlet and outlet is abnormall.
ON a.the outdoor control board is short circuited.
b.the drive board is short circuited.
c.the other components are short circuited.
ON a. the connection wires are loose.
b.the outdoor board or drive board failed.
ON a.the EEPROM chip is loose.
b.the EEPROM chip inserted in wrong direction.
c. The EEPROM chip failed.
ON a.the compressor exhaust temperature sensor
failed.
b.the refrigerant of the unit is low.
OFF a.the outdoor ambient temperature sensor
connecter loose.
b.the outdoor ambient temperature sensor
failed.
c.the outdoor control board failed.
BLINKS a.the compressor exhaust temperature sensor
connector loose.
b.the refrigerant of the unit is low.
BLINKS a.the indoor coil temperature sensor connector
loose.
b.the indoor coil temperature sensor failed.
c.the indoor control board failed.
d. the refrigerant system is abnormal.