SiUS04-924
Table of Contents iii
2.10 WEEKLY TIMER Operation ....................................................................... 60
Part 6
Service Diagnosis................................................................66
1. Caution for Diagnosis................................................................................67
2. Problem Symptoms and Measures...........................................................68
3. Service Check Function ............................................................................69
4. Troubleshooting ........................................................................................72
4.1 Error Codes and Description...................................................................... 72
4.2 Indoor Unit PCB Abnormality ..................................................................... 73
4.3 Freeze-up Protection Control or High Pressure Control............................. 74
4.4 Fan Motor (DC Motor) or Related Abnormality........................................... 76
4.5 Thermistor or Related Abnormality (Indoor Unit)........................................ 78
4.6 Signal Transmission Error (between Indoor and Outdoor Unit) ................. 79
4.7 Unspecified Voltage (between Indoor and Outdoor Units)......................... 80
4.8 Outdoor Unit PCB Abnormality................................................................... 81
4.9 OL Activation (Compressor Overload) ....................................................... 82
4.10 Compressor Lock ....................................................................................... 83
4.11 DC Fan Lock .............................................................................................. 84
4.12 Input Overcurrent Detection ....................................................................... 85
4.13 Four-Way Valve Abnormality...................................................................... 86
4.14 Discharge Pipe Temperature Control......................................................... 88
4.15 High Pressure Control in Cooling............................................................... 89
4.16 Compressor System Sensor Abnormality .................................................. 90
4.17 Position Sensor Abnormality ...................................................................... 91
4.18 CT or Related Abnormality......................................................................... 93
4.19 Thermistor or Related Abnormality (Outdoor Unit)..................................... 95
4.20 Electrical Box Temperature Rise................................................................ 97
4.21 Radiation Fin Temperature Rise ................................................................ 98
4.22 Output Overcurrent Detection .................................................................. 100
4.23 Insufficient Gas......................................................................................... 102
4.24 Low-voltage Detection or Over-voltage Detection.................................... 104
4.25 Signal Transmission Error on Outdoor Unit PCB ..................................... 105
5. Check......................................................................................................106
5.1 How to Check........................................................................................... 106
Part 7
Removal Procedure...........................................................113
1. Indoor Unit...............................................................................................114
1.1 Removal of Air Filter / Front Panel ........................................................... 114
1.2 Removal of Front Grille ............................................................................ 117
1.3 Removal of Electrical Box ........................................................................ 120
1.4 Removal of PCB....................................................................................... 127
1.5 Removal of Horizontal Blades (Louvers)/Vertical blades(Fins)/Swing Motors
135
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