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a) Check the power supply.
b) 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.
c) Change a new outdoor unit PCB.
5.4.14E2xOutdoor unit fan motor fault
Description: When the chip detects the fan IPM over current, it reports a fault
Troubleshooting and repair:
a) Cut off power supply and then rotate the fan blade by hand, to check whether the fan is blocked
or the screws are not tightened.
b) Check the connection between fan motor and PCB
c) Change a new PCB
5.4.15H2x Compressor fault
Description: An abnormal inverter compressor drive is detected by a special detection circuit,
including communication signal detection, voltage detection, current detection, compressor rotation
speed signal detection and so on.
Possible reason:
Wrong wiring connection
IPM malfunction
Compressor malfunction
Faulty outdoor unit PCB
Outdoor unit fan motor
Troubleshooting and repair:
a) Check the wiring between PCB and compressor according to wiring diagram.
b) Check the outdoor unit fan and outdoor unit ventilation.
c) Check the compressor resistance
d) If all are no problem, change the outdoor PCB.
5.4.16P3 Primary / secondary over-current protection
Description: detected current is higher than setting value.
Possible reason:
Refrigerant is too much
Liquid side is block
Heat exchanging in outdoor unit is not good
Compressor malfunction
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