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Table Of Contents - Haier MRV 5 Series Troubleshooting Manual

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Part 1. R32 series Trouble Shooting
4-Way Valve Reversing Failure.....................................................................................................................................1
Communication Error Between Indoor And Oudtoor Unit............................................................................................9
Communication Error Between Power Module And Pcb.........................................................................................18
Compressor Start Failure..........................................................................................................................................27
Dc Fan Motor Failure.................................................................................................................................................34
High Pressure Switch Off Failure................................................................................................................................40
Indoor Unit Overload.................................................................................................................................................52
Temperature Sensor Failure......................................................................................................................................62
Part 2. MRV 5 series trouble shooting
Commnunication Between Indoor And Wired Controller Failure..................................................................................70
Communication Between Dc Fan Motor And Indoor Pcb Failure...............................................................................79
Communication Between Indoor And Display Board Failure.......................................................................................82
Dc Fan Motor Failure.................................................................................................................................................89
Dc Motor Model Is Wrong.........................................................................................................................................95
Fan Module Commnication Failure............................................................................................................................98
Fan Module Hardware Overcurrent.........................................................................................................................103
Indoor Address Repeated Failure.............................................................................................................................110
Indoor Eeprom Failure.........................................................................................................................................115
Indoor Float Switch Failure.......................................................................................................................................120
Indoor Temperature Sensor Failure..........................................................................................................................128
Indoor Unit 50Hz Zero-Crossing Failure...................................................................................................................138
Power Module Commnication Failure......................................................................................................................144
Power Module Hardware Overcurrent.....................................................................................................................149
The Compressor Out Of Control...............................................................................................................................157
Troubleshooting For 4-Way Valve Reversing Failure..................................................................................................164
Troubleshooting For Mrv 5 Indoor And Outdoor Communication Failure..................................................................175
Troubleshooting For Outdoor Temperature Sensor Failure........................................................................................188
Troubleshooting For The Compressor Startup Failure................................................................................................201
2. Part inspection
MRV 5 outdoor fan motor inspection......................................................................................................................207
Mrv 5 Power Module Inspection...........................................................................................................................210
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