Mitsubishi Electric R410A Service Handbook page 245

8-10-2 Checking the Inverter Board Error Detection Circuit........................................................................... 278
8-10-3 Checking the Compressor for Ground Fault and Coil Resistance Problems ...................................... 278
8-10-4 Checking the Inverter for Damage at No-Load ................................................................................... 278
8-10-5 Checking the Inverter for Damage during Compressor Operation...................................................... 279
8-10-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems ......................................... 279
8-10-7 Checking the Fan Board Error Detection Circuit at No Load .............................................................. 279
8-10-8 Checking the Fan Inverter for Damage at No Load ............................................................................ 280
8-10-9 Checking the Fan Inverter for Damage with Load .............................................................................. 281
8-10-10 Checking the Installation Conditions................................................................................................... 281
8-10-11 Solutions for the Main No-Fuse Breaker Trip...................................................................................... 282
8-10-12 Solutions for the Main Earth Leakage Breaker Trip ............................................................................ 282
8-10-13 Simple Check on Inverter Circuit Components ................................................................................... 283
8-10-14 Troubleshooting Problems with IGBT Module .................................................................................... 283
8-11 Control Circuit (TLMU) ..................................................................................................................... 285
8-11-1 Control Power Supply Function Block................................................................................................. 285
8-11-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit ............................ 288
8-12 Control Circuit (YLMU) ..................................................................................................................... 290
8-12-1 Control Power Supply Function Block................................................................................................. 290
8-12-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit ............................ 292
8-13 Measures for Refrigerant Leakage .................................................................................................. 293
8-14 Compressor Replacement Instructions.......................................................................................... 295
8-15 Heat exchanger Replacement Instructions .................................................................................... 297
8-16 Troubleshooting Problems Using the LED Status Indicators on the Outdoor Unit ................... 298
HWE14080 - 236 - GB