Chapter 8 Troubleshooting Based On Observed Symptoms - Mitsubishi Electric PURY-P200YLM-A(1) Service Handbook

Chapter 8 Troubleshooting Based on Observed Symptoms
8-1 MA Remote Controller Problems..................................................................................................... 297
8-1-1 The LCD Does Not Light Up. .............................................................................................................. 297
8-1-2 The LCD Momentarily Lights Up and Then Goes Off. ........................................................................ 298
8-1-3 "HO" and "PLEASE WAIT" Do Not Go Off the Screen. ...................................................................... 299
8-1-4 Air Conditioning Units Do Not Operate When the ON Button Is Pressed. .......................................... 300
8-2 ME remote Controller Problems ...................................................................................................... 301
8-2-1 The LCD Does Not Light Up. .............................................................................................................. 301
8-2-2 The LCD Momentarily Lights Up and Then Goes Off. ........................................................................ 302
8-2-3 "HO" Does Not Go Off the Screen. ..................................................................................................... 303
8-2-4 "88" Appears on the LCD.................................................................................................................... 304
8-3 Refrigerant Control Problems.......................................................................................................... 305
8-3-1 Units in the Cooling Mode Do Not Operate at Expected Capacity...................................................... 305
8-3-2 Units in the Heating Mode Do Not Operate at Expected Capacity. .................................................... 307
8-3-3 Outdoor Units Stop at Irregular Times. ............................................................................................... 309
8-4 Checking Transmission Waveform and for Electrical Noise Interference .................................. 310
8-4-1 M-NET................................................................................................................................................. 310
8-4-2 MA Remote Controller ........................................................................................................................ 312
8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems....... 313
8-5-1 Comparing the High-Pressure Sensor Measurement and Gauge Pressure....................................... 313
8-5-2 High-Pressure Sensor Configuration (63HS1,PS1,PS3) .................................................................... 313
8-5-3 Comparing the Low-Pressure Sensor Measurement and Gauge Pressure........................................ 314
8-5-4 Low-Pressure Sensor Configuration (63LS) ....................................................................................... 314
8-6 Troubleshooting Solenoid Valve Problems.................................................................................... 315
8-7 Troubleshooting Outdoor Unit Fan Problems................................................................................ 321
8-8 Troubleshooting LEV Problems ...................................................................................................... 322
8-8-1 General Overview on LEV Operation.................................................................................................. 322
8-8-2 Possible Problems and Solutions ....................................................................................................... 324
8-8-3 Coil Removal Instructions ................................................................................................................... 325
8-9 Troubleshooting Problems with Major Components on BC Controller....................................... 326
8-9-1 Pressure Sensor ................................................................................................................................. 326
8-9-2 Temperature Sensor ........................................................................................................................... 328
8-9-3 Troubleshooting Flowchart for LEVs................................................................................................... 330
8-9-4 Troubleshooting Flowchart for Solenoid Valves.................................................................................. 334
8-9-5 BC Controller Transformer.................................................................................................................. 336
8-10 Troubleshooting Inverter Problems ................................................................................................ 337
8-10-1 Inverter-Related Problems and Solutions ........................................................................................... 337
8-10-2 Checking the Inverter Board Error Detection Circuit........................................................................... 339
8-10-3 Checking the Compressor for Ground Fault and Coil Resistance Problems ...................................... 339
8-10-4 Checking the Inverter for Damage at No-Load ................................................................................... 339
8-10-5 Checking the Inverter for Damage during Compressor Operation...................................................... 340
8-10-6 Checking the Converter for Damage during Compressor Operation .................................................. 341
8-10-7 Checking the Fan Motor for Ground Fault and Coil Resistance Problems ......................................... 341
8-10-8 Checking the Fan Board Error Detection Circuit at No Load .............................................................. 341
8-10-9 Checking the Fan Inverter for Damage at No Load ............................................................................ 342
8-10-10 Checking the Fan Inverter for Damage with Load .............................................................................. 343
8-10-11 Checking the Installation Conditions................................................................................................... 343
8-10-12 Solutions for the Main No-Fuse Breaker Trip...................................................................................... 344
HWE1314A
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