Service manual

SiBE05-722ED
Service Diagnosis 56
Part 6
Service Diagnosis
1. General Problem Symptoms and Check Items .....................................57
2. Troubleshooting with LED .....................................................................58
2.1 Indoor Unit..............................................................................................58
2.2 Outdoor Unit ...........................................................................................58
3. Service Diagnosis .................................................................................59
4. Troubleshooting ....................................................................................62
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 (AC Motor) or Related Abnormality.......................................65
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................67
4.6 Refrigerant Shortage ..............................................................................68
4.7 Low-voltage Detection or Over-voltage Detection..................................70
4.8 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......72
4.9 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ...............74
4.10 Outdoor Unit PCB Abnormality...............................................................75
4.11 OL Activation (Compressor Overload) ...................................................76
4.12 Compressor Lock ...................................................................................78
4.13 DC Fan Lock ..........................................................................................79
4.14 Input Overcurrent Detection ...................................................................80
4.15 Four Way Valve Abnormality..................................................................81
4.16 Discharge Pipe Temperature Control.....................................................83
4.17 High Pressure Control in Cooling ...........................................................84
4.18 Compressor System Sensor Abnormality ..............................................85
4.19 Position Sensor Abnormality ..................................................................86
4.20 DC Voltage / Current Sensor Abnormality..............................................88
4.21 Thermistor or Related Abnormality (Outdoor Unit).................................89
4.22 Electrical Box Temperature Rise............................................................91
4.23 Radiation Fin Temperature Rise ............................................................94
4.24 Output Overcurrent Detection ................................................................97
5. Check ....................................................................................................99
5.1 Thermistor Resistance Check ................................................................99
5.2 Hall IC Check .......................................................................................100
5.3 Power Supply Waveforms Check.........................................................100
5.4 Electronic Expansion Valve Check.......................................................101
5.5 Four Way Valve Performance Check ...................................................102
5.6 Inverter Unit Refrigerant System Check...............................................102
5.7 Inverter Analyzer Check .......................................................................103
5.8 Rotation Pulse Check on the Outdoor Unit PCB ..................................104
5.9 Installation Condition Check.................................................................105
5.10 Discharge Pressure Check...................................................................106
5.11 Outdoor Fan System Check .................................................................106
5.12 Main Circuit Short Check......................................................................107
5.13 Power Module Check ...........................................................................109