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Mitsubishi Electric PURY-HP72 Service Handbook page 261

R410a
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Table of Contents
8-10-13 Simple Check on Inverter Circuit Components ................................................................................... 295
8-10-14 Troubleshooting Problems with Intelligent Power Module .................................................................. 296
8-10-15 Troubleshooting Problems with Diode Stack ...................................................................................... 297
8-11
Troubleshooting Inverter Problems (YKMU) .................................................................................. 298
8-11-1 Inverter-Related Problems and Solutions ........................................................................................... 298
8-11-2 Checking the Inverter Board Error Detection Circuit........................................................................... 300
8-11-4 Checking the Inverter for Damage at No-Load ................................................................................... 300
8-11-5 Checking the Inverter for Damage during Compressor Operation...................................................... 301
8-11-7 Checking the Fan Board Error Detection Circuit at No Load .............................................................. 301
8-11-8 Checking the Fan Inverter for Damage at No Load ............................................................................ 302
8-11-9 Checking the Fan Inverter for Damage with Load .............................................................................. 303
8-11-10 Checking the Installation Conditions................................................................................................... 303
8-11-11 Solutions for the Main No-Fuse Breaker Trip...................................................................................... 304
8-11-12 Solutions for the Main Earth Leakage Breaker Trip ............................................................................ 304
8-11-13 Simple Check on Inverter Circuit Components ................................................................................... 305
8-11-14 Troubleshooting Problems with IGBT Module .................................................................................... 305
8-12
Control Circuit (TKMU) ..................................................................................................................... 307
8-12-1 Control Power Supply Function Block................................................................................................. 307
8-13
Control Circuit (YKMU)..................................................................................................................... 309
8-13-1 Control Power Supply Function Block................................................................................................. 309
8-14
Measures for Refrigerant Leakage .................................................................................................. 311
8-15
Compressor Replacement Instructions.......................................................................................... 313
8-16
Solenoid Valve Block and Check Valve Replacement Instructions ............................................. 315
8-17
BC Controller Maintenance Instructions ........................................................................................ 319
8-18
HWE13080
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