Part 6 Service Diagnosis - Daikin FTX20JV1B Service Manual

1. Troubleshooting with LED .....................................................................46
2. Problem Symptoms and Measures .......................................................47
3. Service Check Function ........................................................................48
4. Troubleshooting ....................................................................................51
5. Check ....................................................................................................85
45
Service Diagnosis
1.1 Indoor Unit..............................................................................................46
1.2 Outdoor Unit ...........................................................................................46
4.1 Error Codes and Description ..................................................................51
4.2 Indoor Unit PCB Abnormality .................................................................52
4.3 Freeze-up Protection Control or Heating Peak-cut Control....................53
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................54
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................56
4.6 Refrigerant Shortage ..............................................................................57
4.7 Low-voltage Detection or Over-voltage Detection..................................59
4.8 Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......61
4.9 Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............63
4.10 Outdoor Unit PCB Abnormality...............................................................64
4.11 OL Activation (Compressor Overload) ...................................................65
4.12 Compressor Lock ...................................................................................67
4.13 DC Fan Lock ..........................................................................................68
4.14 Input Overcurrent Detection ...................................................................69
4.15 Four Way Valve Abnormality..................................................................70
4.16 Discharge Pipe Temperature Control.....................................................72
4.17 High Pressure Control in Cooling ...........................................................73
4.18 Compressor System Sensor Abnormality ..............................................74
4.19 Position Sensor Abnormality ..................................................................75
4.20 DC Voltage / Current Sensor Abnormality..............................................77
4.21 Thermistor or Related Abnormality (Outdoor Unit).................................78
4.22 Electrical Box Temperature Rise............................................................80
4.23 Radiation Fin Temperature Rise ............................................................81
4.24 Output Overcurrent Detection ................................................................83
5.1 Thermistor Resistance Check ................................................................85
5.2 Fan Motor Connector Output Check ......................................................86
5.3 Power Supply Waveforms Check...........................................................87
5.4 Electronic Expansion Valve Check.........................................................87
5.5 Four Way Valve Performance Check .....................................................88
5.6 Inverter Units Refrigerant System Check ...............................................88
5.7 Inverter Analyzer Check .........................................................................89
5.8 Rotation Pulse Check on the Outdoor Unit PCB ....................................90
5.9 Installation Condition Check...................................................................91
5.10 Discharge Pressure Check.....................................................................91
5.11 Outdoor Fan System Check ...................................................................92
5.12 Main Circuit Short Check........................................................................92
5.13 Power Module Check .............................................................................93
SiBE041010EA
Part 6
Service Diagnosis