Insufficient Gas - Daikin SiEN04-306D Service Manual

Troubleshooting

4.20 Insufficient Gas

U0
remote control
Display
Method of
Gas shortage detection I : A gas shortage is detected by checking the CT-detected input current
Malfunction value and the compressor running frequency.
Gas shortage detection II : A gas shortage is detected by checking the difference between
Detection
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 :
Decision DC current × DC voltage <
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.
R-410A
R22
2YC63
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
136
1756 / 256
2600 / 256
2420 / 256
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
(A/Hz) × Compressor running frequency +
–50
–300
55
SiEN04-306D
Service Diagnosis