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SiUS121827E
144 Part 6 Service Diagnosis
7.3 Wiring Error Check Unexecuted............................................................... 200
7.4 Unspecified Voltage (Between Indoor Unit and Outdoor Unit), Anti-icing
Control in Other Rooms............................................................................ 201
7.5 Anti-icing Control for Indoor Unit .............................................................. 202
7.6 Outdoor Unit PCB Abnormality................................................................. 204
7.7 OL Activation (Compressor Overload) ..................................................... 205
7.8 Compressor Lock ..................................................................................... 208
7.9 DC Fan Lock ............................................................................................ 210
7.10 Input Overcurrent Detection ..................................................................... 212
7.11 Four Way Valve Abnormality.................................................................... 214
7.12 Discharge Pipe Temperature Control....................................................... 216
7.13 High Pressure Control in Cooling ............................................................. 217
7.14 Compressor Sensor System Abnormality ................................................ 219
7.15 Position Sensor Abnormality .................................................................... 221
7.16 Thermistor or Related Abnormality (Outdoor Unit)................................... 224
7.17 Electrical Box Temperature Rise.............................................................. 226
7.18 Radiation Fin Temperature Rise .............................................................. 227
7.19 Output Overcurrent Detection .................................................................. 229
8. Check ......................................................................................................232
8.1 Thermistor Resistance Check .................................................................. 232
8.2 Indoor Fan Motor Connector Check......................................................... 233
8.3 Hall IC Check ........................................................................................... 234
8.4 Power Supply Waveform Check............................................................... 235
8.5 Electronic Expansion Valve Check........................................................... 236
8.6 Four Way Valve Performance Check ....................................................... 237
8.7 Inverter Unit Refrigerant System Check................................................... 237
8.8 Inverter Analyzer Check........................................................................... 238
8.9 Rotation Pulse Check on the Outdoor Unit PCB ...................................... 240
8.10 Installation Condition Check..................................................................... 240
8.11 Discharge Pressure Check....................................................................... 241
8.12 Outdoor Fan System Check ..................................................................... 241
8.13 Main Circuit Short Check.......................................................................... 242
8.14 Capacitor Voltage Check.......................................................................... 244
8.15 Power Module Check ............................................................................... 245
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