Insufficient Gas - Daikin F-Series Service Manual

Troubleshooting
4.21

Insufficient Gas

U0
Remote
Controller
Display
Method of Gas shortage detection I :
Malfunction A gas shortage is detected by checking the power consumption value and the compressor
running frequency.
Detection
Malfunction Gas shortage detection I :
Power consumption < 4578 / 256 (W/Hz) × Compressor running frequency – 638 (W)
Decision
However, when the status of running frequency > 48 (Hz) is kept on for a certain time.
Conditions
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
238
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Stop valve closed
Electronic expansion valve defective
SiBE12-712C
Service Diagnosis