SiAU18-715
300 Troubleshooting
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
7.33 Excessive Number of Indoor Units .......................................................396
7.34 Address Duplication of Central Remote Controller...............................397
7.35 Malfunction of Transmission between Central Remote Controller and
Indoor Unit............................................................................................398
7.36 System is not Set yet............................................................................400
7.37 Malfunction of System, Refrigerant System Address Undefined..........401
8. Check ..................................................................................................402
9. Thermistor Resistance / Temperature Characteristics........................405
10.Pressure Sensor .................................................................................407
11.Method of Replacing The Inverter’s Power Transistors Modules........408
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