Service manual

SiBE041134
Service Diagnosis 59
Part 6
Service Diagnosis
1. Troubleshooting with LED .....................................................................60
1.1 Indoor Unit..............................................................................................60
1.2 Outdoor Unit ...........................................................................................60
2. Problem Symptoms and Measures .......................................................61
3. Service Check Function ........................................................................62
4. Troubleshooting ....................................................................................65
4.1 Error Codes and Description ..................................................................65
4.2 Indoor Unit PCB Abnormality .................................................................66
4.3 Freeze-up Protection Control or Heating Peak-cut Control....................68
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................70
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................72
4.6 Refrigerant Shortage ..............................................................................73
4.7 Low-voltage Detection or Over-voltage Detection..................................75
4.8 Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......77
4.9 Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............79
4.10 Outdoor Unit PCB Abnormality...............................................................80
4.11 OL Activation (Compressor Overload) ...................................................81
4.12 Compressor Lock ...................................................................................82
4.13 DC Fan Lock ..........................................................................................83
4.14 Input Overcurrent Detection ...................................................................84
4.15 Four Way Valve Abnormality..................................................................85
4.16 Discharge Pipe Temperature Control.....................................................87
4.17 High Pressure Control in Cooling ...........................................................88
4.18 Compressor System Sensor Abnormality ..............................................89
4.19 Position Sensor Abnormality ..................................................................90
4.20 DC Voltage / Current Sensor Abnormality..............................................92
4.21 Thermistor or Related Abnormality (Outdoor Unit).................................93
4.22 Electrical Box Temperature Rise............................................................95
4.23 Radiation Fin Temperature Rise ............................................................97
4.24 Output Overcurrent Detection ................................................................99
5. Check ..................................................................................................101
5.1 Thermistor Resistance Check ..............................................................101
5.2 Fan Motor Connector Output Check ....................................................102
5.3 Power Supply Waveforms Check.........................................................102
5.4 Electronic Expansion Valve Check.......................................................103
5.5 Four Way Valve Performance Check ...................................................104
5.6 Inverter Units Refrigerant System Check .............................................104
5.7 “Inverter Checker” Check .....................................................................105
5.8 Rotation Pulse Check on the Outdoor Unit PCB ..................................106
5.9 Installation Condition Check.................................................................107
5.10 Discharge Pressure Check...................................................................107
5.11 Outdoor Fan System Check.................................................................108
5.12 Main Circuit Short Check......................................................................108
5.13 Power Module Check ...........................................................................109