Daikin FTX50K(M/2)V1B - Part 6 - Service Diagnosis

SiBE041525F
43 Service Diagnosis
Part 6
Service Diagnosis
1. General Problem Symptoms and Check Items .....................................44
2. Troubleshooting with LED .....................................................................45
2.1 Indoor Unit..............................................................................................45
2.2 Outdoor Unit ...........................................................................................45
3. Service Diagnosis .................................................................................46
4. Troubleshooting ....................................................................................49
4.1 Error Codes and Descriptions ................................................................49
4.2 Indoor Unit PCB Abnormality .................................................................50
4.3 Freeze-up Protection Control / Heating Peak-cut Control ......................51
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................52
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................54
4.6 Low-voltage Detection or Over-voltage Detection..................................55
4.7 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......57
4.8 Unspecified Voltage (Between Indoor Unit and Outdoor Unit)...............59
4.9 Outdoor Unit PCB Abnormality...............................................................60
4.10 OL Activation (Compressor Overload) ...................................................61
4.11 Compressor Lock ...................................................................................63
4.12 DC Fan Lock ..........................................................................................64
4.13 Input Overcurrent Detection ...................................................................65
4.14 Four Way Valve Abnormality..................................................................66
4.15 Discharge Pipe Temperature Control.....................................................68
4.16 High Pressure Control in Cooling ...........................................................69
4.17 Compressor System Sensor Abnormality ..............................................70
4.18 Position Sensor Abnormality ..................................................................71
4.19 Thermistor or Related Abnormality (Outdoor Unit).................................73
4.20 Electrical Box Temperature Rise............................................................75
4.21 Radiation Fin Temperature Rise ............................................................76
4.22 Output Overcurrent Detection ................................................................77
5. Check ....................................................................................................79
5.1 Thermistor Resistance Check ................................................................79
5.2 Indoor Fan Motor Connector Output Check ...........................................80
5.3 Power Supply Waveforms Check...........................................................81
5.4 Electronic Expansion Valve Check.........................................................81
5.5 Four Way Valve Performance Check .....................................................82
5.6 Inverter Unit Refrigerant System Check.................................................82
5.7 Inverter Analyzer Check .........................................................................83
5.8 Rotation Pulse Check on the Outdoor Unit PCB....................................85
5.9 Installation Condition Check...................................................................86
5.10 Discharge Pressure Check.....................................................................86
5.11 Outdoor Fan System Check ...................................................................87
5.12 Main Circuit Short Check........................................................................87
5.13 Power Module Check .............................................................................88