SiUS041829E
Part 6 Service Diagnosis 63
1. General Problem Symptoms and Check Items .........................................65
2. Troubleshooting with LED .........................................................................66
2.1 Indoor Unit.................................................................................................. 66
2.2 Outdoor Unit ............................................................................................... 66
3. Service Diagnosis .....................................................................................67
3.1 Method 1 .................................................................................................... 67
3.2 Method 2 .................................................................................................... 68
4. Troubleshooting ........................................................................................70
4.1 Error Codes and Description ...................................................................... 70
4.2 Indoor Unit PCB Abnormality ..................................................................... 71
4.3 Freeze-up Protection Control/Heating Peak-cut Control ............................ 73
4.4 Indoor Fan Motor (DC Motor) or Related Abnormality ............................... 74
4.5 Thermistor or Related Abnormality............................................................. 77
4.6 Front Panel Open/Close Fault.................................................................... 78
4.7 Low-voltage Detection or Over-voltage Detection...................................... 79
4.8 Signal Transmission Error (Between Indoor Unit and Outdoor Unit).......... 81
4.9 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ................... 83
4.10 Outdoor Unit PCB Abnormality................................................................... 84
4.11 OL Activation (Compressor Overload) ....................................................... 85
4.12 Compressor Lock ....................................................................................... 88
4.13 DC Fan Lock .............................................................................................. 90
4.14 Input Overcurrent Detection ....................................................................... 91
4.15 Four Way Valve Abnormality...................................................................... 93
4.16 Discharge Pipe Temperature Control......................................................... 95
4.17 High Pressure Control in Cooling ............................................................... 96
4.18 System Shutdown due to Temperature Abnormality in Compressor ......... 98
4.19 Compressor System Sensor Abnormality .................................................. 99
4.20 Position Sensor Abnormality .................................................................... 100
4.21 DC Voltage/Current Sensor Abnormality.................................................. 103
4.22 Thermistor or Related Abnormality (Outdoor Unit)................................... 104
4.23 Electrical Box Temperature Rise.............................................................. 106
4.24 Radiation Fin Temperature Rise .............................................................. 107
4.25 Output Overcurrent Detection .................................................................. 109
5. Check ......................................................................................................112
5.1 Thermistor Resistance Check .................................................................. 112
5.2 Indoor Fan Motor Connector Check......................................................... 113
5.3 Power Supply Waveform Check............................................................... 113
5.4 Electronic Expansion Valve Check........................................................... 114
5.5 Four Way Valve Performance Check ....................................................... 115
Part 6
Service Diagnosis
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