Part 6 Service Diagnosis - Daikin FTX50GV1B Service Manual

1. General Problem Symptoms and Check Items .....................................51
2. Troubleshooting with LED .....................................................................52
3. Service Diagnosis .................................................................................53
4. Troubleshooting ....................................................................................56
5. Check ....................................................................................................95
49
Service Diagnosis
2.1 Indoor Unit..............................................................................................52
2.2 Outdoor Unit ...........................................................................................52
4.1 Error Codes and Description ..................................................................56
4.2 Indoor Unit PCB Abnormality .................................................................57
4.3 Freeze-up Protection Control / Heating Peak-cut Control ......................58
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................59
4.5 Thermistor or Related Abnormality (Indoor Unit)....................................61
4.6 Refrigerant Shortage ..............................................................................62
4.7 Low-voltage Detection or Over-voltage Detection..................................64
4.8 Signal Transmission Error (Between Indoor Unit and Outdoor Unit)......66
4.9 Signal Transmission Error on Outdoor Unit PCB
(RX50/60G2V1B, 71 Class Only) ...........................................................68
4.10 Unspecified Voltage (Between Indoor Unit and Outdoor Unit) ...............69
4.11 Outdoor Unit PCB Abnormality...............................................................70
4.12 OL Activation (Compressor Overload) ...................................................72
4.13 Compressor Lock ...................................................................................74
4.14 DC Fan Lock ..........................................................................................75
4.15 Input Overcurrent Detection ...................................................................76
4.16 Four Way Valve Abnormality..................................................................77
4.17 Discharge Pipe Temperature Control.....................................................79
4.18 High Pressure Control in Cooling ...........................................................80
4.19 Compressor System Sensor Abnormality ..............................................81
4.20 Position Sensor Abnormality ..................................................................83
4.21 CT or Related Abnormality (RX50/60G2V1B, 71 Class Only)................86
4.22 Thermistor or Related Abnormality (Outdoor Unit).................................88
4.23 Electrical Box Temperature Rise............................................................90
4.24 Radiation Fin Temperature Rise ............................................................91
4.25 Output Overcurrent Detection ................................................................93
5.1 Thermistor Resistance Check ................................................................95
5.2 Indoor Fan Motor Connector Output Check ...........................................96
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 ....................................99
5.9 Installation Condition Check.................................................................100
5.10 Discharge Pressure Check...................................................................100
5.11 Outdoor Fan System Check .................................................................101
5.12 Main Circuit Short Check......................................................................101
SiBE041029EC
Part 6
Service Diagnosis