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Chapter 8 Troubleshooting Based On Observed Symptoms - Mitsubishi Electric PURY-HP72 Service Handbook

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Table of Contents
Chapter 8
Troubleshooting Based on Observed Symptoms
8-1
MA Remote Controller Problems..................................................................................................... 251
8-1-1
The LCD Does Not Light Up. .............................................................................................................. 251
8-1-2
The LCD Momentarily Lights Up and Then Goes Off. ........................................................................ 252
8-1-3
"HO" and "PLEASE WAIT" Do Not Go Off the Screen. ...................................................................... 253
8-1-4
Air Conditioning Units Do Not Operate When the ON Button Is Pressed. .......................................... 254
8-2
ME remote Controller Problems ...................................................................................................... 255
8-2-1
The LCD Does Not Light Up. .............................................................................................................. 255
8-2-2
The LCD Momentarily Lights Up and Then Goes Off. ........................................................................ 256
8-2-3
"HO" Does Not Go Off the Screen. ..................................................................................................... 257
8-2-4
"88" Appears on the LCD.................................................................................................................... 258
8-3
Refrigerant Control Problems.......................................................................................................... 259
8-3-1
Units in the Cooling Mode Do Not Operate at Expected Capacity...................................................... 259
8-3-2
Units in the Heating Mode Do Not Operate at Expected Capacity. .................................................... 261
8-3-3
Outdoor Units Stop at Irregular Times. ............................................................................................... 263
8-4
8-4-1
M-NET................................................................................................................................................. 264
8-4-2
MA Remote Controller ........................................................................................................................ 266
8-5
8-5-1
8-5-2
High-Pressure Sensor Configuration (63HS1,PS1,PS3) .................................................................... 267
8-5-3
Comparing the Low-Pressure Sensor Measurement and Gauge Pressure........................................ 268
8-5-4
Low-Pressure Sensor Configuration (63LS) ....................................................................................... 268
8-6
Troubleshooting Solenoid Valve Problems.................................................................................... 269
8-7
Troubleshooting Outdoor Unit Fan Problems................................................................................ 272
8-8
Troubleshooting LEV Problems ...................................................................................................... 273
8-8-1
General Overview on LEV Operation.................................................................................................. 273
8-8-2
Possible Problems and Solutions ....................................................................................................... 275
8-8-3
Coil Removal Instructions ................................................................................................................... 276
8-9
Troubleshooting Problems with Major Components on BC Controller....................................... 277
8-9-1
Pressure Sensor ................................................................................................................................. 277
8-9-2
Temperature Sensor ........................................................................................................................... 279
8-9-3
Troubleshooting Flowchart for LEVs................................................................................................... 281
8-9-4
Troubleshooting Flowchart for Solenoid Valves.................................................................................. 284
8-9-5
BC Controller Transformer.................................................................................................................. 287
8-10
Troubleshooting Inverter Problems (TKMU) .................................................................................. 288
8-10-1 Inverter-Related Problems and Solutions ........................................................................................... 288
8-10-2 Checking the Inverter Board Error Detection Circuit........................................................................... 290
8-10-4 Checking the Inverter for Damage at No-Load ................................................................................... 290
8-10-5 Checking the Inverter for Damage during Compressor Operation...................................................... 291
8-10-7 Checking the Fan Board Error Detection Circuit at No Load .............................................................. 291
8-10-8 Checking the Fan Inverter for Damage at No Load ............................................................................ 292
8-10-9 Checking the Fan Inverter for Damage with Load .............................................................................. 293
8-10-10 Checking the Installation Conditions................................................................................................... 293
8-10-11 Solutions for the Main No-Fuse Breaker Trip...................................................................................... 294
8-10-12 Solutions for the Main Earth Leakage Breaker Trip ............................................................................ 294
HWE13080
- 249 -
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