SiBE041102_A
Service Diagnosis
47
Part 6
Service Diagnosis
1. Troubleshooting with LED .....................................................................48
1.1
Indoor Unit..............................................................................................48
1.2
Outdoor Unit ...........................................................................................48
2. Problem Symptoms and Measures .......................................................49
3. Service Check Function ........................................................................50
4. Troubleshooting ....................................................................................53
4.1
Error Codes and Description ..................................................................53
4.2
Indoor Unit PCB Abnormality .................................................................54
4.3
Freeze-up Protection Control or Heating Peak-cut Control ....................55
4.4
Fan Motor (AC Motor) or Related Abnormality.......................................57
4.5
Thermistor or Related Abnormality (Indoor Unit)....................................59
4.6
Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......60
4.7
Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............62
4.8
Outdoor Unit PCB Abnormality...............................................................63
4.9
OL Activation (Compressor Overload) ...................................................64
4.10 Compressor Lock ...................................................................................65
4.11 Input Overcurrent Detection ...................................................................66
4.12 Four Way Valve Abnormality..................................................................67
4.13 Discharge Pipe Temperature Control.....................................................69
4.14 High Pressure Control in Cooling ...........................................................70
4.15 Compressor System Sensor Abnormality ..............................................71
4.16 Position Sensor Abnormality ..................................................................72
4.17 DC Voltage / Current Sensor Abnormality..............................................74
4.18 Thermistor or Related Abnormality (Outdoor Unit).................................75
4.19 Electrical Box Temperature Rise............................................................77
4.20 Radiation Fin Temperature Rise ............................................................79
4.21 Output Overcurrent Detection ................................................................81
4.22 Refrigerant Shortage ..............................................................................83
4.23 Low-voltage Detection or Over-voltage Detection..................................85
5. Check ....................................................................................................87
5.1
Thermistor Resistance Check ................................................................87
5.2
Hall IC Check .........................................................................................88
5.3
Power Supply Waveforms Check...........................................................88
5.4
Electronic Expansion Valve Check.........................................................89
5.5
Four Way Valve Performance Check .....................................................90
5.6
Inverter Unit Refrigerant System Check.................................................90
5.7
“Inverter Checker” Check .......................................................................91
5.8
Installation Condition Check...................................................................92
5.9
Discharge Pressure Check.....................................................................93
5.10 Outdoor Fan System Check ...................................................................93
5.11 Main Circuit Short Check........................................................................94
5.12 Power Module Check .............................................................................94
