Part 6 Service Diagnosis - Daikin FTXS20K2V1B Service Manual

1. General Problem Symptoms and Check Items .....................................55
2. Troubleshooting with LED .....................................................................56
3. Service Diagnosis .................................................................................57
4. Troubleshooting ....................................................................................60
5. Check ....................................................................................................94
54
Service Diagnosis
2.1 Indoor Unit..............................................................................................56
2.2 Outdoor Unit ...........................................................................................56
4.1 Error Codes and Description ..................................................................60
4.2 Indoor Unit PCB Abnormality .................................................................61
4.3 Freeze-up Protection Control / Heating Peak-cut Control ......................62
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................63
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................65
4.6 Refrigerant Shortage ..............................................................................66
4.7 Low-voltage Detection or Over-voltage Detection..................................68
4.8 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......70
4.9 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ...............72
4.10 Outdoor Unit PCB Abnormality...............................................................73
4.11 OL Activation (Compressor Overload) ...................................................75
4.12 Compressor Lock ...................................................................................77
4.13 DC Fan Lock ..........................................................................................78
4.14 Input Overcurrent Detection ...................................................................79
4.15 Four Way Valve Abnormality..................................................................80
4.16 Discharge Pipe Temperature Control .....................................................82
4.17 High Pressure Control in Cooling ...........................................................83
4.18 Compressor System Sensor Abnormality ..............................................84
4.19 Position Sensor Abnormality ..................................................................85
4.20 DC Voltage / Current Sensor Abnormality..............................................87
4.21 Thermistor or Related Abnormality (Outdoor Unit) .................................88
4.22 Electrical Box Temperature Rise............................................................90
4.23 Radiation Fin Temperature Rise ............................................................91
4.24 Output Overcurrent Detection ................................................................92
5.1 Thermistor Resistance Check ................................................................94
5.2 Indoor Fan Motor Connector Output Check ...........................................95
5.3 Power Supply Waveforms Check ...........................................................96
5.4 Electronic Expansion Valve Check.........................................................96
5.5 Four Way Valve Performance Check .....................................................97
5.6 Inverter Unit Refrigerant System Check .................................................97
5.7 Inverter Analyzer Check .........................................................................98
5.8 Rotation Pulse Check on the Outdoor Unit PCB ..................................100
5.9 Installation Condition Check .................................................................101
5.10 Discharge Pressure Check...................................................................101
5.11 Outdoor Fan System Check .................................................................102
5.12 Main Circuit Short Check......................................................................102
5.13 Power Module Check ...........................................................................103
SiBE041134EB
Part 6
Service Diagnosis