SiUS04-702
Service Diagnosis 115
Part 6
Service Diagnosis
1. Caution for Diagnosis.............................................................................116
2. Problem Symptoms and Measures........................................................118
3. Service Check Function .........................................................................119
4. Troubleshooting .....................................................................................122
4.1 Error Codes and Description................................................................... 122
4.2 Indoor Unit PCB Abnormality .................................................................. 123
4.3 Freeze-up Protection Control or High Pressure Control.......................... 124
4.4 Fan Motor or Related Abnormality .......................................................... 126
4.5 Thermistor or Related Abnormality (Indoor Unit)..................................... 129
4.6 Signal Transmission Error (between Indoor and Outdoor Unit) .............. 130
4.7 OL Activation (Compressor Overload) .................................................... 132
4.8 Compressor Lock .................................................................................... 133
4.9 DC Fan Lock ........................................................................................... 135
4.10 Input Over Current Detection .................................................................. 136
4.11 Four Way Valve Abnormality................................................................... 139
4.12 Discharge Pipe Temperature Control...................................................... 143
4.13 High Pressure Control in Cooling ............................................................ 145
4.14 Position Sensor Abnormality ................................................................... 149
4.15 DC Voltage / Current Sensor Abnormality............................................... 151
4.16 CT or Related Abnormality...................................................................... 152
4.17 Thermistor or Related Abnormality (Outdoor Unit).................................. 154
4.18 Electrical Box Temperature Rise............................................................. 156
4.19 Radiation Fin Temperature Rise ............................................................. 158
4.20 Output Over Current Detection................................................................ 160
4.21 Insufficient Gas........................................................................................ 164
4.22 Over-voltage Detection............................................................................ 168
4.23 Low-voltage Detection............................................................................. 169
5. Check.....................................................................................................170
5.1 How to Check.......................................................................................... 170
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