SiUS091601EA
Part 6 Service Diagnosis 106
1. General Problem Symptoms and Check Items .......................................108
2. Troubleshooting with LED .......................................................................109
2.1 Indoor Unit................................................................................................ 109
2.2 Outdoor Unit ............................................................................................. 110
3. Service Diagnosis ...................................................................................111
3.1 ARC480 Series......................................................................................... 111
3.2 ARC466 Series......................................................................................... 114
3.3 BRC1E73 ................................................................................................. 117
3.4 BRC082A43 ............................................................................................. 119
4. Error Codes and Description...................................................................123
5. Troubleshooting for FTX, FVXS Series...................................................124
5.1 Indoor Unit PCB Abnormality ................................................................... 124
5.2 Freeze-up Protection Control/Heating Peak-cut Control .......................... 126
5.3 Indoor Fan Motor (DC Motor) or Related Abnormality ............................. 128
5.4 Thermistor or Related Abnormality........................................................... 132
5.5 Low-voltage Detection or Over-voltage Detection.................................... 133
5.6 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)........ 135
5.7 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ................. 137
6. Troubleshooting for FDMQ Series ..........................................................138
6.1 Indoor Unit PCB Abnormality ................................................................... 138
6.2 Drain Level Control System Abnormality.................................................. 139
6.3 Indoor Fan Motor (DC Motor) or Related Abnormality ............................. 140
6.4 Indoor Fan PCB Abnormality.................................................................... 142
6.5 Humidifier or Related Abnormality............................................................ 143
6.6 Thermistor or Related Abnormality........................................................... 144
6.7 Remote Controller Thermistor Abnormality .............................................. 145
6.8 Low-voltage Detection or Over-voltage Detection.................................... 146
6.9 Signal Transmission Error (Between Indoor and Outdoor Unit) ............... 148
6.10 Signal Transmission Error (Between Indoor Unit and Remote Controller)
................................................................................................................. 150
6.11 Signal Transmission Error (Between MAIN/SUB Remote Controllers) .... 151
6.12 Mismatching of Indoor Unit and Outdoor Unit .......................................... 152
7. Troubleshooting for Outdoor Unit............................................................153
7.1 Outdoor Unit PCB Abnormality................................................................. 153
7.2 OL Activation (Compressor Overload) ..................................................... 154
7.3 Compressor Lock ..................................................................................... 157
7.4 DC Fan Lock ............................................................................................ 158
7.5 Input Overcurrent Detection ..................................................................... 159
7.6 Four Way Valve Abnormality.................................................................... 161
Part 6
Service Diagnosis
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