Daikin FTXG20LV1BW, Service Manual

Page: 63 / 128

SiBE041401E
Service Diagnosis 52
Part 6
Service Diagnosis
1. General Problem Symptoms and Check Items .....................................53
2. Troubleshooting with LED .....................................................................54
2.1 Indoor Unit..............................................................................................54
2.2 Outdoor Unit ...........................................................................................54
3. Service Diagnosis .................................................................................55
4. Troubleshooting ....................................................................................58
4.1 Error Codes and Description ..................................................................58
4.2 Indoor Unit PCB Abnormality .................................................................59
4.3 Freeze-up Protection Control / Heating Peak-cut Control ......................60
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................61
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................63
4.6 Front Panel Open / Close Fault..............................................................64
4.7 Refrigerant Shortage ..............................................................................65
4.8 Low-voltage Detection or Over-voltage Detection..................................67
4.9 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......69
4.10 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ...............71
4.11 Outdoor Unit PCB Abnormality...............................................................72
4.12 OL Activation (Compressor Overload) ...................................................73
4.13 Compressor Lock ...................................................................................75
4.14 DC Fan Lock ..........................................................................................76
4.15 Input Overcurrent Detection ...................................................................77
4.16 Four Way Valve Abnormality..................................................................78
4.17 Discharge Pipe Temperature Control.....................................................80
4.18 High Pressure Control in Cooling ...........................................................81
4.19 Compressor System Sensor Abnormality ..............................................82
4.20 Position Sensor Abnormality ..................................................................83
4.21 DC Voltage / Current Sensor Abnormality (20/25/35 Class Only)..........85
4.22 Thermistor or Related Abnormality (Outdoor Unit).................................86
4.23 Electrical Box Temperature Rise............................................................88
4.24 Radiation Fin Temperature Rise ............................................................89
4.25 Output Overcurrent Detection ................................................................91
5. Check ....................................................................................................93
5.1 Thermistor Resistance Check ................................................................93
5.2 Fan Motor Connector Output Check ......................................................94
5.3 Power Supply Waveforms Check...........................................................94
5.4 Electronic Expansion Valve Check.........................................................94
5.5 Four Way Valve Performance Check .....................................................95
5.6 Inverter Unit Refrigerant System Check.................................................95
5.7 Inverter Analyzer Check .........................................................................96
5.8 Rotation Pulse Check on the Outdoor Unit PCB ....................................97
5.9 Installation Condition Check...................................................................98
5.10 Discharge Pressure Check.....................................................................99
5.11 Outdoor Fan System Check ...................................................................99
5.12 Main Circuit Short Check......................................................................100
5.13 Power Module Check ...........................................................................101