Service Manual

SiUS121502E
Service Diagnosis 97
Part 6
Service Diagnosis
1. General Problem Symptoms and Check Items .........................................99
2. Troubleshooting with LED .......................................................................100
2.1 Indoor Unit................................................................................................ 100
2.2 Outdoor Unit ............................................................................................. 101
3. Service Diagnosis ...................................................................................102
3.1 CTXS, FTXS, CDXS, FDXS, FVXS Series .............................................. 102
3.2 FFQ Series ............................................................................................... 108
4. Code Indication on Remote Controller ....................................................114
4.1 CTXS, FTXS, CDXS, FDXS, FVXS Series .............................................. 114
4.2 FFQ Series ............................................................................................... 114
4.3 Outdoor Unit ............................................................................................. 115
5. Troubleshooting for CTXS, FTXS, CDXS, FDXS, FVXS Series .............116
5.1 Indoor Unit PCB Abnormality ................................................................... 116
5.2 Freeze-up Protection Control / Heating Peak-cut Control ........................ 118
5.3 Fan Motor or Related Abnormality ........................................................... 119
5.4 Thermistor or Related Abnormality........................................................... 123
5.5 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)........ 124
5.6 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ................. 126
6. Troubleshooting for FFQ Series..............................................................127
6.1 Indoor Unit PCB Abnormality ................................................................... 127
6.2 Drain Level Control System Abnormality.................................................. 128
6.3 Fan Motor (AC Motor) or Related Abnormality......................................... 129
6.4 Drain System Abnormality........................................................................ 130
6.5 Thermistor or Related Abnormality........................................................... 131
6.6 Remote Controller Thermistor Abnormality .............................................. 132
6.7 Signal Transmission Error
(Between Indoor Unit and Remote Controller) ......................................... 133
6.8 Signal Transmission Error
(Between MAIN Remote Controller and SUB Remote Controller) ........... 134
6.9 Field Setting Abnormality ......................................................................... 135
7. Troubleshooting for Outdoor Unit............................................................136
7.1 Refrigerant Shortage ................................................................................ 136
7.2 Low-voltage Detection or Over-voltage Detection.................................... 138
7.3 Wiring Error Check Unexecuted............................................................... 140
7.4 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) /
Anti-icing Control in Other Rooms............................................................ 141
7.5 Anti-icing Control for Indoor Unit .............................................................. 142
7.6 Outdoor Unit PCB Abnormality................................................................. 144
7.7 OL Activation (Compressor Overload) ..................................................... 145
7.8 Compressor Lock ..................................................................................... 147
7.9 DC Fan Lock ............................................................................................ 148