Service manual

SiBE06-708_C
Service Diagnosis 75
Part 6
Service Diagnosis
1. Troubleshooting with LED .....................................................................77
1.1 Indoor Unit..............................................................................................77
1.2 Outdoor Unit ...........................................................................................77
2. Problem Symptoms and Measures .......................................................78
3. Service Check Function ........................................................................79
4. Troubleshooting ....................................................................................82
4.1 Error Codes and Description ..................................................................82
4.2 Indoor Unit PCB Abnormality .................................................................83
4.3 Freeze-up Protection Control or Heating Peak-cut Control....................84
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................85
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................87
4.6 Refrigerant Shortage ..............................................................................88
4.7 Low-voltage Detection or Over-voltage Detection..................................91
4.8 Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......93
4.9 Signal Transmission Error on Outdoor Unit PCB
(RK(X)S50F2V1B, RK(X)S50G2V1B, RXS50J2V1B Only)....................95
4.10 Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............96
4.11 Outdoor Unit PCB Abnormality...............................................................97
4.12 OL Activation (Compressor Overload) ...................................................99
4.13 Compressor Lock .................................................................................101
4.14 DC Fan Lock ........................................................................................102
4.15 Input Overcurrent Detection .................................................................103
4.16 Four Way Valve Abnormality................................................................104
4.17 Discharge Pipe Temperature Control...................................................106
4.18 High Pressure Control in Cooling .........................................................107
4.19 Compressor System Sensor Abnormality ............................................108
4.20 Position Sensor Abnormality ................................................................110
4.21 DC Voltage / Current Sensor Abnormality (25/35 Class Only).............113
4.22 CT or Related Abnormality (RK(X)S50F2V1B, RK(X)S50G2V1B,
RXS50J2V1B Only)..............................................................................114
4.23 Thermistor or Related Abnormality (Outdoor Unit)...............................116
4.24 Electrical Box Temperature Rise..........................................................118
4.25 Radiation Fin Temperature Rise ..........................................................121
4.26 Output Overcurrent Detection ..............................................................124
5. Check ..................................................................................................126
5.1 Thermistor Resistance Check ..............................................................126
5.2 Fan Motor Connector Output Check ....................................................127
5.3 Power Supply Waveforms Check.........................................................127
5.4 Electronic Expansion Valve Check.......................................................128
5.5 Four Way Valve Performance Check ...................................................129
5.6 Inverter Units Refrigerant System Check .............................................129
5.7 Inverter Analyzer Check .......................................................................130
5.8 Rotation Pulse Check on the Outdoor Unit PCB ..................................131
5.9 Installation Condition Check.................................................................133
5.10 Discharge Pressure Check...................................................................133