E2X Outdoor Unit Fan Motor Fault; H2X Compressor Fault; P3 Primary / Secondary Over-Current Protection - Omega OTEC IEWB Series Service Manual

 Refrigerant system leakage or block
 Faulty outdoor unit PCB
 Connection problem
Troubleshooting and repair:
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.

2.4.14 E2x Outdoor unit fan motor fault

Description: When the chip detects the fan IPM overcurrent, 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

2.4.15 H2x 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.

2.4.16 P3 Primary / secondary over-current protection

Description: detected current is higher than setting value.
Possible reason:
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