44 PB
TROUBLESHOOTING
Diagnostic Codes
Outdoor Unit
Diag
Code
Outdoor Failure Description LED1 LED2 LED3 the root cause my be one of the following
Compressor drive faulted BLINKS OFF BLINKS a.the outdoor drive board failed.
b.the compressor failed.
c. the outdoor control board failed.
Outdoor fan motor locked rotor
protection
BLINKS BLINKS ON a.the connection of the outdoor fan motor is
loose.
b.there is something blocking the outdoor fan.
c.the fan motor failed.
d.the outdoor control board failed.
Outdoor coil anti-overload
protection with cooling
OFF ON OFF a.There is too much refrigerant.
b.the outdoor fan motor failed.
c.the outdoor fan is broken.
d.the condensor is dirty.
e.the air inlet and air outlet of the indoor unit
and the outdoor unit is not normal.
IPM module protection OFF BLINKS OFF a.The IPM board failed.
b.The outdoor fan is broken.
c.The outdoor fan motor failed.
d.The outdoor fan has been blocked.
e.The condenser is dirty.
f.The outdoor unit has been installed without
standard.
PFC protection BLINKS OFF OFF a.the PFC failed.
b.the outdoor drive board failed.
Compressor pre heating process BLINKS ON BLINKS it is normal mode in cold weather
Chip in outdoor board faulted ON OFF BLINKS a. Using the wrong drive board.
b. Using the wrong compressor.
AC voltage higher or lower
protection
ON ON BLINKS a.the supply voltage is higher or lower than
normal.
b.the inner supply voltage of the unit is higher
or lower than normal.
DC compressor start failure BLINKS BLINKS OFF a.the outdoor drive board failed.
b.the compressor failed.
Outdoor ambient temperature too
low protection
BLINKS OFF OFF a. Outdoor ambient temperature too low.
Mark description: the lights ash every two seconds for the following faults
Protection against overheated
outdoor radiator
BLINKS OFF OFF a. Radiator sensors failed.
b. Detection circuit of the sensor on the control
panel fails
Protection of the system against too
high pressure
BLINKS BLINKS OFF a. The pressure switch fails
b. The pressure detection switch on the control
panel failed.
c. The measured value of the system pressure
exceeds the limit.
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