56 PB
TROUBLESHOOTING
Outdoor Unit
Diagnostic Codes - Unit Not Running
Outdoor Failure Description LED1 LED2 LED3 the root cause my be one of the following
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 or
too high protection
BLINKS OFF OFF a. Outdoor ambient temperature too low or too high.
There is a leak in the product. BLINKS ON ON a. There is a leak in the indoor
b. There is a leak in the outdoor
c. There is a leak in the connecting pipe
Mark description: the lights flash 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.
Protection of the system abnormal OFF BLINKS ON a. Check whether the outdoor valves are opened.
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