Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 255

8-10-12 Checking the Error-Detection Circuit on the Pump INV Board (Without load) ...................................... 49
8-10-13 Checking the Pump INV Board for Damage (Without load).................................................................. 49
8-10-14 Checking the Pump INV Board for Damage (During pump operation) ................................................. 50
8-10-15 Checking the Installation Conditions..................................................................................................... 50
8-10-16 Solutions for the Main Breaker Trip ...................................................................................................... 50
8-10-17 Solutions for the Main Earth Leakage Breaker Trip .............................................................................. 51
8-10-18 Simple Check on Inverter Circuit Components ..................................................................................... 52
8-10-19 Troubleshooting Problems with IGBT Module ...................................................................................... 53
8-10-20 Checking the Fan Inverter Heatsink for Clogging ................................................................................. 58
8-11 Control Circuit..................................................................................................................................... 59
8-11-1 Control Power Supply Function Block................................................................................................... 59
8-11-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit .............................. 63
8-12 Measures for Refrigerant Leakage .................................................................................................... 69
8-13 Parts Replacement Instructions ........................................................................................................ 71
8-13-1 Ensuring Maintenance Space (Preparation for the Maintenance of Refrigerant Circuit Parts)............. 71
8-13-2 Notes on Wiring Installation .................................................................................................................. 75
8-13-3 Four-way Valve and Check Valve Replacement Procedure ................................................................. 79
8-13-4 Compressor Replacement Procedure................................................................................................... 91
8-13-5 Removal Instructions for the Control Box ............................................................................................. 93
8-13-6 Maintenance Procedure for the Drain Pan............................................................................................ 96
8-13-7 Maintenance Procedures for the Heat Exchanger .............................................................................. 102
8-13-8 Accumulator Replacement Procedure ................................................................................................ 116
8-14 Hydro Unit Maintenance Instructions ............................................................................................. 120
8-14-1 Plate Heat Exchanger Replacement Procedure ................................................................................. 120
8-14-2 Strainer Replacement Procedure........................................................................................................ 122
8-14-3 Pressure Sensor (Refrigerant) Replacement Procedure .................................................................... 123
8-14-4 Check Valve Replacement Procedure ................................................................................................ 124
8-14-5 Solenoid Valve and LEV Body Replacement Procedure .................................................................... 125
8-14-6 Pump Replacement Procedure........................................................................................................... 126
8-14-7 Thermistors Replacement Procedure ................................................................................................. 128
8-14-8 Solenoid Valve Coil Replacement Procedure ..................................................................................... 129
8-14-9 LEV Coils Replacement Procedure .................................................................................................... 130
8-14-10 Pressure Sensor (Water) Replacement Procedure ............................................................................ 131
8-14-11 Water Purge Valve Replacement Procedure ...................................................................................... 132
8-14-12 Safe Valve Replacement Procedure................................................................................................... 133
8-15 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit ................... 134
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