SiUS331604E
117 Service Diagnosis
Part 6
Service Diagnosis
1. Servicing Items to be Confirmed .............................................................119
1.1 Troubleshooting........................................................................................ 119
1.2 Precautions for Maintenance.................................................................... 119
1.3 Refrigerant Properties (R-410A)............................................................... 120
2. Symptom-based Troubleshooting ...........................................................121
2.1 Indoor Unit Overall ................................................................................... 121
2.2 With the Optional Infrared Floor Sensor................................................... 124
3. Service Check Function ..........................................................................125
3.1 Wired Remote Controller.......................................................................... 125
3.2 Wireless Remote Controller ..................................................................... 127
3.3 Error Codes and Descriptions .................................................................. 129
3.4 Error Code Indication by Outdoor Unit PCB............................................. 131
4. Troubleshooting by Error Code ...............................................................135
4.1 External Protection Device Abnormality ................................................... 135
4.2 Indoor Unit PCB Abnormality ................................................................... 136
4.3 Drain Level Control System (S1L) Abnormality........................................ 137
4.4 Indoor Fan Motor (M1F) Lock, Overload .................................................. 139
4.5 Indoor Fan Motor Abnormality.................................................................. 142
4.6 Overload/Overcurrent/Indoor Fan Motor Lock.......................................... 146
4.7 Swing Flap Motor Abnormality ................................................................. 147
4.8 Power Supply Voltage Abnormality .......................................................... 149
4.9 Electronic Expansion Valve Coil Abnormality, Dust Clogging .................. 150
4.10 Drain Level Above Limit ........................................................................... 152
4.11 Capacity Determination Device Abnormality ............................................ 153
4.12 Transmission Abnormality (between Indoor Unit PCB and Fan PCB) ..... 154
4.13 Thermistor Abnormality ............................................................................ 156
4.14 Combination Abnormality (between Indoor Unit PCB and Fan PCB)....... 157
4.15 Remote Sensor Abnormality .................................................................... 158
4.16 Humidity Sensor System Abnormality ...................................................... 159
4.17 Infrared Presence/Floor Sensor Error ...................................................... 160
4.18 Remote Controller Thermistor Abnormality .............................................. 165
4.19 Outdoor Main PCB Abnormality ............................................................... 166
4.20 Activation of High Pressure Switch .......................................................... 167
4.21 Activation of Low Pressure Sensor .......................................................... 169
4.22 Inverter Compressor Motor Lock.............................................................. 171
4.23 Outdoor Fan Motor Abnormality ............................................................... 173
4.24 Electronic Expansion Valve Coil Abnormality........................................... 175
4.25 Discharge Pipe Temperature Abnormality ............................................... 177
4.26 Refrigerant Overcharged.......................................................................... 178
4.27 Thermistor Abnormality ............................................................................ 179
4.28 High Pressure Sensor Abnormality .......................................................... 180
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