Part 6 Service Diagnosis - Daikin FVXG25K2V1B Service Manual

1. Troubleshooting with LED .....................................................................58
2. Problem Symptoms and Measures .......................................................59
3. Service Check Function ........................................................................60
4. Troubleshooting ....................................................................................63
5. Check ..................................................................................................106
56
Service Diagnosis
1.1 Indoor Unit..............................................................................................58
1.2 Outdoor Unit ...........................................................................................58
4.1 Error Codes and Description ..................................................................63
4.2 Indoor Unit PCB Abnormality .................................................................64
4.3 Freeze-up Protection Control or Heating Peak-cut Control....................65
4.4 Fan Motor (DC Motor) or Related Abnormality.......................................66
4.5 Radiant Panel Temperature Rise, Indoor Electronic Expansion Valve
(Motor Operated Valve) Abnormality,
Freeze-up Protection Control .................................................................68
4.6 Thermistor or Related Abnormality (Indoor Unit)....................................70
4.7 Refrigerant Shortage ..............................................................................71
4.8 Low-voltage Detection or Over-voltage Detection..................................74
4.9 Signal Transmission Error (between Indoor Unit and Outdoor Unit) ......76
4.10 Signal Transmission Error on Outdoor Unit PCB
(RXG50K2V1B Only)..............................................................................78
4.11 Unspecified Voltage (between Indoor Unit and Outdoor Unit) ...............79
4.12 Outdoor Unit PCB Abnormality...............................................................80
4.13 OL Activation (Compressor Overload) ...................................................82
4.14 Compressor Lock ...................................................................................84
4.15 DC Fan Lock ..........................................................................................85
4.16 Input Overcurrent Detection ...................................................................86
4.17 Four Way Valve Abnormality..................................................................87
4.18 Discharge Pipe Temperature Control.....................................................89
4.19 High Pressure Control in Cooling ...........................................................90
4.20 Compressor System Sensor Abnormality ..............................................91
4.21 Position Sensor Abnormality ..................................................................93
4.22 DC Voltage / Current Sensor Abnormality (25/35 Class Only)...............96
4.23 CT or Related Abnormality (RXG50K2V1B Only) ..................................97
4.24 Thermistor or Related Abnormality (Outdoor Unit).................................99
4.25 Electrical Box Temperature Rise..........................................................101
4.26 Radiation Fin Temperature Rise ..........................................................102
4.27 Output Overcurrent Detection ..............................................................104
5.1 Thermistor Resistance Check ..............................................................106
5.2 Fan Motor Connector Output Check ....................................................107
5.3 Power Supply Waveforms Check.........................................................107
5.4 Electronic Expansion Valve Check.......................................................108
5.5 Four Way Valve Performance Check ...................................................109
5.6 Inverter Units Refrigerant System Check .............................................109
5.7 Inverter Analyzer Check .......................................................................110
5.8 Rotation Pulse Check on the Outdoor Unit PCB ..................................112
SiBE061121_A
Part 6
Service Diagnosis