SiBE041012_B
Service Diagnosis
61
Part 6
Service Diagnosis
1. Troubleshooting with LED .....................................................................63
1.1
Indoor Unit..............................................................................................63
1.2
Outdoor Unit ...........................................................................................63
2. Problem Symptoms and Measures .......................................................64
3. Service Check Function ........................................................................65
4. Troubleshooting ....................................................................................68
4.1
Error Codes and Description ..................................................................68
4.2
Indoor Unit PCB Abnormality .................................................................69
4.3
Freeze-up Protection Control or Heating Peak-cut Control ....................70
4.4
Fan Motor (DC Motor) or Related Abnormality.......................................71
4.5
Thermistor or Related Abnormality (Indoor Unit)....................................73
4.6
Front Panel Open / Close Fault..............................................................74
4.7
Refrigerant Shortage ..............................................................................75
4.8
Low-voltage Detection or Over-voltage Detection..................................78
4.9
Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......80
4.10 Signal Transmission Error on Outdoor Unit PCB
(RXG50K2V1B Only)..............................................................................82
4.11 Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............83
4.12 Outdoor Unit PCB Abnormality...............................................................84
4.13 OL Activation (Compressor Overload) ...................................................86
4.14 Compressor Lock ...................................................................................88
4.15 DC Fan Lock ..........................................................................................89
4.16 Input Overcurrent Detection ...................................................................90
4.17 Four Way Valve Abnormality..................................................................91
4.18 Discharge Pipe Temperature Control.....................................................93
4.19 High Pressure Control in Cooling ...........................................................94
4.20 Compressor System Sensor Abnormality ..............................................95
4.21 Position Sensor Abnormality ..................................................................97
4.22 DC Voltage / Current Sensor Abnormality (25/35 Class Only).............100
4.23 CT or Related Abnormality (RXG50K2V1B Only) ................................101
4.24 Thermistor or Related Abnormality (Outdoor Unit)...............................103
4.25 Electrical Box Temperature Rise..........................................................105
4.26 Radiation Fin Temperature Rise ..........................................................106
4.27 Output Overcurrent Detection ..............................................................108
5. Check ..................................................................................................110
5.1
Thermistor Resistance Check ..............................................................110
5.2
Fan Motor Connector Output Check ....................................................111
5.3
Power Supply Waveforms Check.........................................................111
5.4
Outdoor Electronic Expansion Valve Check.........................................112
5.5
Four Way Valve Performance Check ...................................................113
5.6
Inverter Units Refrigerant System Check .............................................113
5.7
Inverter Analyzer Check .......................................................................114
5.8
Rotation Pulse Check on the Outdoor Unit PCB ..................................116
5.9
Installation Condition Check.................................................................117
5.10 Discharge Pressure Check...................................................................117
