SiBE041101
73
Service Diagnosis
Part 6
Service Diagnosis
1. Troubleshooting with LED .....................................................................75
1.1
Indoor Unit..............................................................................................75
1.2
Outdoor Unit ...........................................................................................75
2. Problem Symptoms and Measures .......................................................76
3. Service Check Function ........................................................................77
3.1
ARC452 Series.......................................................................................77
4. Troubleshooting ....................................................................................80
4.1
Error Codes and Description ..................................................................80
4.2
Indoor Unit PCB Abnormality .................................................................81
4.3
Freeze-up Protection Control or Heating Peak-cut Control ....................82
4.4
Fan Motor (DC Motor) or Related Abnormality.......................................84
4.5
Thermistor or Related Abnormality (Indoor Unit)....................................86
4.6
Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......87
4.7
Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............88
4.8
Outdoor Unit PCB Abnormality...............................................................89
4.9
OL Activation (Compressor Overload) ...................................................92
4.10 Compressor Lock ...................................................................................93
4.11 DC Fan Lock ..........................................................................................94
4.12 Input Overcurrent Detection ...................................................................95
4.13 Four Way Valve Abnormality..................................................................96
4.14 Discharge Pipe Temperature Control.....................................................98
4.15 High Pressure Control in Cooling .........................................................100
4.16 Compressor System Sensor Abnormality ............................................101
4.17 Position Sensor Abnormality ................................................................103
4.18 DC Voltage / Current Sensor Abnormality (20/25/35/42 Class) ...........106
4.19 CT or Related Abnormality (50 Class)..................................................107
4.20 Thermistor or Related Abnormality (Outdoor Unit)...............................109
4.21 Electrical Box Temperature Rise..........................................................111
4.22 Radiation Fin Temperature Rise ..........................................................113
4.23 Output Overcurrent Detection ..............................................................115
4.24 Refrigerant Shortage ............................................................................117
4.25 Low-voltage Detection or Over-voltage Detection................................120
4.26 Signal Transmission Error on Outdoor Unit PCB (50 Class Only) .......122
5. Check ..................................................................................................123
5.1
Fan Motor Connector Output Check ....................................................123
5.2
Electronic Expansion Valve Check.......................................................123
5.3
Four Way Valve Performance Check ...................................................124
5.4
Thermistor Resistance Check ..............................................................125
5.5
Installation Condition Check.................................................................126
5.6
Discharge Pressure Check...................................................................126
5.7
Outdoor Fan System Check .................................................................127
5.8
Power Supply Waveforms Check.........................................................127
5.9
Inverter Units Refrigerant System Check .............................................127