38
Possible reason:
Wrong wire connection
IPM malfunction
Compressor malfunction
Faulty PCB
Troubleshooting and repair:
a) Check the wiring between PCB and compressor.
b) Check the outdoor unit fan and ventilation.
c) Check the IPM in PCB.
d) Check the resistance of compressor.
e) If all are normal, change a new PCB.
5.4.20P7 IDU anti-frosting protection
Description: indoor unit evaporator temperature T2 is lower than 0℃.
Possible reason:
Filter or evaporator is dirty
Indoor fan motor can’t work normally or the flap is closed
Troubleshooting and repair:
a) Clear the filter and evaporator
b) Check the fan motor
5.4.21P8 High IPM temperature protection
Description: the detected temperature of IPM is higher than 100℃.
Possible reason:
Power supply issue
System leakage or block
Faulty outdoor unit PCB
Connection problem
Troubleshooting and repair:
d) Check the power supply.
e) Check the fastening screws on the PCB and IPM radiator. If they are not fixed tightly, tighten the
screws and apply silicon grease. Otherwise, go to next step.
f) Change a new outdoor unit PCB.
5.4.22 P9 Outdoor unit fan motor stall protection
Please refer to 5.4.5
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