P4 High Discharge Temperature Protection; P5 High Condenser Temperature Protection; P6 Ipm Module Fault - Omega OTEC IEWB Series Service Manual

 Refrigerant is too much
 Liquid side is block
 Heat exchanging in outdoor unit is not good

Compressor malfunction

2.4.17 P4 High discharge temperature protection

Description: discharge temperature is higher than 115℃.
Possible reason:
 Lack of refrigerant
 High ambient temperature or heat exchanging in condenser side is bad
 There is air or N2 or water in refrigerant system
 Block in low pressure side
Troubleshooting and repair:
a) Check the refrigerant charging record and check if there is any leakage point.
b) Whether it is too dirty in outdoor coil? Improve the ventilation condition.
c) Check whether the fan motor can work normally.

2.4.18 P5 High condenser temperature protection

Description: in cooling mode or dry mode, the T3 temperature is higher than setting value.
Possible reason:
 Bad ventilation
 Faulty temperature sensor
 Faulty PCB
Troubleshooting and repair:
a) Check the heat exchange of outdoor unit condenser is good or not.
b) Check the temperature sensor resistance.

2.4.19 P6 IPM module fault

Description: Below table shows detailed error code about P6.
13
DC bus low voltage protection
DC bus high voltage protection
MCE fault / sync / compressor start fault
Zero speed protection
L1
L2
L4
L5