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HWE12050 GB
Chapter 8 Troubleshooting Based on Observed Symptoms
8-1 MA Remote Controller Problems..................................................................................................... 207
8-1-1 The LCD Does Not Light Up. .............................................................................................................. 207
8-1-2 The LCD Momentarily Lights Up and Then Goes Off. ........................................................................ 208
8-1-3 "HO" and "PLEASE WAIT" Do Not Go Off the Screen. ...................................................................... 209
8-1-4 Air Conditioning Units Do Not Operate When the ON Button Is Pressed. .......................................... 210
8-2 ME remote Controller Problems ...................................................................................................... 211
8-2-1 The LCD Does Not Light Up. .............................................................................................................. 211
8-2-2 The LCD Momentarily Lights Up and Then Goes Off. ........................................................................ 212
8-2-3 "HO" Does Not Go Off the Screen. ..................................................................................................... 213
8-2-4 "88" Appears on the LCD.................................................................................................................... 214
8-3 Refrigerant Control Problems.......................................................................................................... 215
8-3-1 Units in the Cooling Mode Do Not Operate at Expected Capacity...................................................... 215
8-3-2 Units in the Heating Mode Do Not Operate at Expected Capacity. .................................................... 217
8-3-3 Outdoor Units Stop at Irregular Times. ............................................................................................... 219
8-4 Checking Transmission Waveform and for Electrical Noise Interference .................................. 220
8-4-1 M-NET................................................................................................................................................. 220
8-4-2 MA Remote Controller ........................................................................................................................ 222
8-5 Pressure Sensor Circuit Configuration and Troubleshooting Pressure Sensor Problems....... 223
8-5-1 Comparing the High-Pressure Sensor Measurement and Gauge Pressure....................................... 223
8-5-2 High-Pressure Sensor Configuration (63HS1).................................................................................... 223
8-5-3 Comparing the Low-Pressure Sensor Measurement and Gauge Pressure........................................ 224
8-5-4 Low-Pressure Sensor Configuration (63LS) ....................................................................................... 224
8-6 Troubleshooting Solenoid Valve Problems.................................................................................... 225
8-7 Troubleshooting Outdoor Unit Fan Problems................................................................................ 227
8-8 Troubleshooting LEV Problems ...................................................................................................... 228
8-8-1 General Overview on LEV Operation.................................................................................................. 228
8-8-2 Possible Problems and Solutions ....................................................................................................... 231
8-8-3 Coil Removal Instructions ................................................................................................................... 232
8-9 Troubleshooting Inverter Problems ................................................................................................ 234
8-9-1 Inverter-Related Problems and Solutions ........................................................................................... 234
8-9-2 Checking the Inverter Board Error Detection Circuit........................................................................... 236
8-9-3 Checking the Compressor for Ground Fault and Coil Resistance Problems ...................................... 236
8-9-4 Checking the Inverter for Damage at No-Load ................................................................................... 236
8-9-5 Checking the Inverter for Damage during Compressor Operation...................................................... 237
8-9-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems ......................................... 237
8-9-7 Checking the Fan Board Error Detection Circuit at No Load .............................................................. 237
8-9-8 Checking the Fan Inverter for Damage at No Load ............................................................................238
8-9-9 Checking the Fan Inverter for Damage with Load .............................................................................. 239
8-9-10 Checking the Installation Conditions................................................................................................... 239
8-9-11 Solutions for the Main No-Fuse Breaker Trip...................................................................................... 240
8-9-12 Solutions for the Main Earth Leakage Breaker Trip ............................................................................ 240
8-9-13 Simple Check on Inverter Circuit Components ................................................................................... 241
8-9-14 Troubleshooting Problems with IGBT Module .................................................................................... 241
8-10 Control Circuit................................................................................................................................... 243
8-10-1 Control Power Supply Function Block................................................................................................. 243
8-10-2 Troubleshooting Problems with Outdoor Unit Transmission Power Supply Circuit ............................ 245
8-11 Measures for Refrigerant Leakage .................................................................................................. 246
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