Specifications

SiUS12-928_A
89 Service Diagnosis
Part 6
Service Diagnosis
1. Caution for Diagnosis................................................................................91
1.1 Troubleshooting with LED .......................................................................... 91
2. Problem Symptoms and Measures ...........................................................93
3. Service Check Function ............................................................................94
3.1 ARC452 Series Remote Controller ............................................................ 94
3.2 ARC433 Series Remote Controller ............................................................ 97
4. Code Indication on the Remote Controller ..............................................100
4.1 Error Codes and Description of Fault ....................................................... 100
5. Troubleshooting ......................................................................................101
5.1 Indoor Unit................................................................................................ 101
5.2 Outdoor Unit ............................................................................................. 102
5.3 Indoor Unit PCB Abnormality ................................................................... 103
5.4 Freeze-up Protection Control or Heating Peak-cut Control...................... 104
5.5 Fan Motor or Related Abnormality ........................................................... 106
5.6 Thermistor or Related Abnormality (Indoor Unit)...................................... 109
5.7 Signal Transmission Error (between Indoor and Outdoor Units).............. 110
5.8 Unspecified Voltage (between Indoor and Outdoor Units) ....................... 112
5.9 Anti-icing Function.................................................................................... 113
5.10 Outdoor Unit PCB Abnormality (24/32 Class) .......................................... 115
5.11 OL Activation (Compressor Overload) ..................................................... 116
5.12 Compressor Lock ..................................................................................... 117
5.13 DC Fan Lock ............................................................................................ 118
5.14 Input Overcurrent Detection ..................................................................... 119
5.15 Four-Way Valve Abnormality (18 Class) .................................................. 121
5.16 Discharge Pipe Temperature Control....................................................... 123
5.17 High Pressure Control in Cooling ............................................................. 124
5.18 Compressor Sensor System Abnormality (24/32 Class) .......................... 126
5.19 Position Sensor Abnormality .................................................................... 128
5.20 CT or Related Abnormality ....................................................................... 131
5.21 Thermistor or Related Abnormality (Outdoor Unit)................................... 133
5.22 Electrical Box Temperature Rise.............................................................. 135
5.23 Radiation Fin Temperature Rise .............................................................. 138
5.24 Output Overcurrent Detection .................................................................. 141
5.25 Refrigerant Shortage ................................................................................ 143
5.26 Low-voltage Detection or Over-voltage Detection.................................... 146
5.27 Signal Transmission Error (on Outdoor Unit PCB)
(24/32 Class)147
5.28 Unspecified Voltage (between Indoor and Outdoor Units) / Anti-icing Func-
tion in Other Rooms 148
6. Check ......................................................................................................149
6.1 How to Check ........................................................................................... 149