Table of Contents
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Part 5 Remote Controller ............................................................ 51
1. 20/25 Class ...........................................................................................52
2. 35/42/50 Class ......................................................................................54
Part 6 Service Diagnosis............................................................. 56
1. General Problem Symptoms and Check Items .....................................57
2. Troubleshooting with LED .....................................................................58
3. Service Diagnosis .................................................................................59
4. Troubleshooting ....................................................................................62
5. Check ....................................................................................................97
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3.12 Malfunctions ...........................................................................................50
2.1 Indoor Unit..............................................................................................58
2.2 Outdoor Unit ...........................................................................................58
4.1 Error Codes and Description ..................................................................62
4.2 Indoor Unit PCB Abnormality .................................................................63
4.3 Freeze-up Protection Control / Heating Peak-cut Control ......................64
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................65
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................68
4.6 Refrigerant Shortage ..............................................................................69
4.7 Low-voltage Detection or Over-voltage Detection..................................71
4.9 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ...............75
4.10 Outdoor Unit PCB Abnormality...............................................................76
4.11 OL Activation (Compressor Overload) ...................................................78
4.12 Compressor Lock ...................................................................................80
4.13 DC Fan Lock ..........................................................................................81
4.14 Input Overcurrent Detection ...................................................................82
4.15 Four Way Valve Abnormality..................................................................83
4.16 Discharge Pipe Temperature Control.....................................................85
4.17 High Pressure Control in Cooling ...........................................................86
4.18 Compressor System Sensor Abnormality ..............................................87
4.19 Position Sensor Abnormality ..................................................................88
4.21 Thermistor or Related Abnormality (Outdoor Unit).................................91
4.22 Electrical Box Temperature Rise............................................................93
4.23 Radiation Fin Temperature Rise ............................................................94
4.24 Output Overcurrent Detection ................................................................95
5.1 Thermistor Resistance Check ................................................................97
5.2 Fan Motor Connector Output Check ......................................................98
5.3 Power Supply Waveforms Check...........................................................99
5.4 Electronic Expansion Valve Check.........................................................99
5.5 Four Way Valve Performance Check ...................................................100
5.6 Inverter Unit Refrigerant System Check...............................................100
5.7 Inverter Analyzer Check .......................................................................101
5.8 Rotation Pulse Check on the Outdoor Unit PCB ..................................102
5.9 Installation Condition Check.................................................................103
5.10 Discharge Pressure Check...................................................................104
5.11 Outdoor Fan System Check .................................................................104
5.12 Main Circuit Short Check......................................................................105
SiBE041434E
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Troubleshooting
