Daikin FVXG25K2V1B Service Manual page 82

Troubleshooting
Refrigerant shortage detection III: (25/35 class only)
When the difference of the temperature is smaller than K°C, it is regarded as refrigerant
shortage.
Operation
mode
Cooling
Heating
Supposed
Causes
72
Description
room thermistor temperature – indoor heat exchanger temperature
outdoor heat exchanger temperature – outdoor temperature
indoor heat exchanger temperature – room thermistor temperature
outdoor temperature – outdoor heat exchanger temperature
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor
Closed stop valve
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Defective outdoor electronic expansion valve
SiBE061121_A
K (°C)
4.0
4.0
3.0
3.0
Service Diagnosis