SiUS121736EA
131 Service Diagnosis
Part 6
Service Diagnosis
1. General Problem Symptoms and Check Items .......................................133
2. Troubleshooting with LED .......................................................................134
2.1 Indoor Unit................................................................................................ 134
2.2 Outdoor Unit ............................................................................................. 136
3. Service Diagnosis ...................................................................................137
3.1 RA Indoor Unit.......................................................................................... 137
3.2 SA Indoor Unit.......................................................................................... 143
4. Code Indication on Remote Controller ....................................................149
4.1 RA Indoor Unit.......................................................................................... 149
4.2 SA Indoor Unit.......................................................................................... 149
4.3 Outdoor Unit ............................................................................................. 150
5. Troubleshooting for RA Indoor Unit.........................................................151
5.1 Indoor Unit PCB Abnormality ................................................................... 151
5.2 Freeze-up Protection Control, Heating Peak-cut Control ......................... 153
5.3 Indoor Fan Motor or Related Abnormality ................................................ 154
5.4 Thermistor or Related Abnormality........................................................... 158
5.5 Front Panel Open/Close Fault.................................................................. 159
5.6 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)........ 160
5.7 Mismatching of Indoor Unit and Outdoor Unit .......................................... 162
6. Troubleshooting for SA Indoor Unit.........................................................163
6.1 Indoor Unit PCB Abnormality ................................................................... 163
6.2 Drain Level Control System Abnormality.................................................. 164
6.3 Indoor Fan Motor or Related Abnormality ................................................ 165
6.4 Indoor Fan PCB Abnormality.................................................................... 169
6.5 Humidifier or Related Abnormality............................................................ 170
6.6 Thermistor or Related Abnormality........................................................... 171
6.7 Presence Sensor or Floor Sensor Abnormality ........................................ 172
6.8 Remote Controller Thermistor Abnormality .............................................. 173
6.9 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)........ 174
6.10 Signal Transmission Error
(Between Indoor Unit and Remote Controller) ......................................... 176
6.11 Signal Transmission Error
(Between MAIN Remote Controller and SUB Remote Controller) ........... 177
6.12 Mismatching of Indoor Unit and Outdoor Unit .......................................... 178
7. Troubleshooting for Outdoor Unit............................................................179
7.1 Refrigerant Shortage ................................................................................ 179
7.2 Low-voltage Detection or Over-voltage Detection.................................... 181
7.3 Wiring Error Check Unexecuted ............................................................... 183
7.4 Unspecified Voltage (Between Indoor Unit and Outdoor Unit),
Anti-Icing Control in Other Rooms............................................................ 184
7.5 Anti-Icing Control for Indoor Unit .............................................................. 185
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