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Si06-313
4.20
Insufficient Gas
U0
Remote
Controller
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
Input current <
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.
R410A
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) x Compressor running frequency × Voltage +
1756 / 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
–50
Troubleshooting
99
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Troubleshooting
