Outdoor unit error code explanation:
For units(except M5OA-36HRDN1-Q model)
Display LED STATUS
E0 Outdoor EEPROM malfunction
E1 No A Indoor unit coil outlet temp. sensor or connector of sensor is defective
E2 No B Indoor unit coil outlet temp. sensor or connector of sensor is defective
E3 No C Indoor unit coil outlet temp. sensor or connector of sensor is defective
E6 No D Indoor unit coil outlet temp. sensor or connector of sensor is defective
E4 Open or short circuit of outdoor unit temperature sensor
E5 Compressor voltage protection
E7 Communication malfunction between IPM board and outdoor main board
P0
Temperature protection of compressor discharge or compressor top.
For M4OC-27HRDN1, M4OC1-27HRDN1-Q,M4OC-36HRDN1-Q,it only means Temperature
protection of compressor discharge
P1 High pressure protection(only for M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q)
P2 Low pressure protection(only for M4OC1-27HRDN1-Q, M4OC-27HRDN1-Q,M4OC-36HRDN1-Q)
P3 Current protection of compressor
P4 IPM module protection
P6 High temperature protection of condenser
P7 Inverter compressor drive protection
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