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SiUS091133
iv Table of Contents
2. Problem Symptoms and Measures...........................................................90
3. Service Check Function............................................................................91
4. Troubleshooting ........................................................................................94
4.1 Error Codes and Description......................................................................94
4.2 Indoor Unit PCB Abnormality .....................................................................95
4.3 Freeze-up Protection Control or Heating Peak-cut Control........................ 97
4.4 Fan Motor or Related Abnormality .............................................................99
4.5 Thermistor or Related Abnormality (Indoor Unit)......................................103
4.6 Refrigerant Shortage................................................................................104
4.7 Low-voltage Detection or Over-voltage Detection....................................107
4.8 Signal Transmission Error (between Indoor Unit and Outdoor Unit)........109
4.9 Signal Transmission Error on Outdoor Unit PCB
(24/30/36 Class Only)111
4.10 Unspecified Voltage (between Indoor Unit and Outdoor Unit) .................112
4.11 Outdoor Unit PCB Abnormality.................................................................113
4.12 OL Activation (Compressor Overload) .....................................................115
4.13 Compressor Lock.....................................................................................116
4.14 DC Fan Lock ............................................................................................117
4.15 Input Overcurrent Detection.....................................................................118
4.16 Four-Way Valve Abnormality....................................................................119
4.17 Discharge Pipe Temperature Control.......................................................121
4.18 High Pressure Control in Cooling.............................................................123
4.19 Compressor System Sensor Abnormality ................................................125
4.20 Position Sensor Abnormality....................................................................128
4.21 DC Voltage / Current Sensor Abnormality (09/12 Class Only).................131
4.22 CT or Related Abnormality (24/30/36 Class Only)...................................132
4.23 Thermistor or Related Abnormality (Outdoor Unit)...................................134
4.24 Electrical Box Temperature Rise.............................................................. 136
4.25 Radiation Fin Temperature Rise ..............................................................138
4.26 Output Overcurrent Detection ..................................................................140
5. Check......................................................................................................142
5.1 Thermistor Resistance Check..................................................................142
5.2 Fan Motor Connector Output Check ........................................................143
5.3 Hall IC Check ...........................................................................................143
5.4 Power Supply Waveforms Check.............................................................144
5.5 Electronic Expansion Valve Check...........................................................144
5.6 Four-Way Valve Performance Check.......................................................145
5.7 Inverter Units Refrigerant System Check.................................................145
5.8 “Inverter Checker” Check.........................................................................146
5.9 Rotation Pulse Check on the Outdoor Unit PCB......................................148
5.10 Installation Condition Check.....................................................................149
5.11 Discharge Pressure Check.......................................................................150
5.12 Outdoor Fan System Check.....................................................................150
5.13 Main Circuit Short Check..........................................................................151
5.14 Capacitor Voltage Check..........................................................................152
5.15 Power Module Check...............................................................................153
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