SiAU18-715
vi Table of Contents
5.10 Malfunction of Suction Air Thermistor ..................................................343
5.11 Malfunction of Remote Controller Thermistor.......................................344
5.12 Transmission Error (between Indoor Unit and Remote Controller) ......345
5.13 Transmission Error (between Main and Sub Remote Controller).........346
5.14 Malfunction of Field Setting Switch ......................................................347
5.15 Check ...................................................................................................348
6. Troubleshooting for BP Unit................................................................350
6.1 Malfunction of Electronic Expansion Valve ..........................................350
6.2 Faulty BP Unit PCB ..............................................................................351
6.3 Faulty BP Liquid or Gas Pipe Thermistor .............................................352
6.4 Transmission Error between Indoor Unit and BP Unit..........................353
6.5 Transmission Error between Outdoor Unit and BP Unit.......................355
6.6 Check ...................................................................................................356
7. Troubleshooting for Outdoor Unit........................................................357
7.1 Faulty Outdoor Unit PCB......................................................................357
7.2 Actuation of High Pressure Switch .......................................................358
7.3 Actuation of Low Pressure Sensor .......................................................360
7.4 Compressor Motor Lock .......................................................................362
7.5 Malfunction of Outdoor Unit Fan Motor ................................................363
7.6 Malfunction of Moving Part of Electronic Expansion Valve
(Y1E, Y3E) ...........................................................................................364
7.7 Abnormal Discharge Pipe Temperature ...............................................366
7.8 Refrigerant Overcharged......................................................................367
7.9 Malfunction of Thermistor for Outdoor Air (R1T) ..................................368
7.10 Malfunction of Discharge Pipe Thermistor (R2T) .................................369
7.11 Malfunction of Thermistor (R3T, R5T) for Suction Pipe1, 2 .................370
7.12 Malfunction of Thermistor (R4T) for Outdoor Unit Heat Exchanger .....371
7.13 Malfunction of Thermistor (R7T) for Outdoor Unit Liquid Pipe .............372
7.14 Malfunction of Subcooling Heat Exchanger Thermistor (R6T) .............373
7.15 Malfunction of High Pressure Sensor...................................................374
7.16 Malfunction of Low Pressure Sensor....................................................375
7.17 Malfunction of PCB...............................................................................376
7.18 Malfunction of Inverter Radiating Fin Temperature Rise......................377
7.19 Inverter Compressor Abnormal ............................................................378
7.20 Inverter Current Abnormal....................................................................379
7.21 Inverter Start up Error...........................................................................380
7.22 Malfunction of Transmission between Inverter and Control PCB.........381
7.23 High Voltage of Capacitor in Main Inverter Circuit ...............................382
7.24 Malfunction of Inverter Radiating Fin Temperature Rise Sensor .........383
7.25 Faulty Combination of Inverter and Fan Driver ....................................384
7.26 Low Pressure Drop Due to Refrigerant Shortage or
Electronic Expansion Valve Failure......................................................385
7.27 Power Supply Insufficient or Instantaneous Failure .............................387
7.28 Check Operation not Executed ............................................................389
7.29 Malfunction of Transmission between Indoor Units and
Outdoor Units .......................................................................................390
7.30 Malfunction of Transmission between Remote Controller and
Indoor Unit............................................................................................392
7.31 Malfunction of Transmission between Main and
Sub Remote Controllers .......................................................................393
7.32 Malfunction of Transmission between Indoor and Outdoor Units in the
Same System .......................................................................................394
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