Daikin FVXS25FV1B Service Manual page 142

SiBE06-708
4.24.2 50 Class
U0
Remote
Controller
Display
Method of Gas shortage detection I :
A gas shortage is detected by checking the CT-detected input current value and the
Malfunction
compressor running frequency.
Detection
Gas shortage detection II :
A gas shortage is detected by checking the difference between indoor unit heat exchanger
temperature and room temperature as well as the difference between outdoor unit heat
exchanger temperature and room temperature.
Malfunction Gas shortage detection I :
DC current ≤
Decision
However, when the status of running frequency > 55 (Hz) is kept on for a certain time.
Conditions
Note : The values are different from model to model.
50 class
Gas shortage detection II :
If a gas shortage error takes place 4 times successively, the system will be shut down. The error
counter will reset itself if this or any other error does not occur during the following 60-minute
compressor running time (total time).
Supposed
Causes
Service Diagnosis
(A/Hz) × Output frequency +
18 / 1000
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Discharge pipe thermistor disconnected, or indoor unit or outdoor unit heat exchanger
thermistor disconnected, room or outside air temperature thermistor disconnected
Stop valve closed
Electronic expansion valve defective
0.7
Troubleshooting
131