Si01-406 Troubleshooting
Service Diagnosis 113
4.18 Insufficient Gas (U0)
Remote
Controller
Display
U0
Method of
Malfunction
Detection
Gas shortage detection I : A gas shortage is detected by checking the CT-detected input current
value and the compressor running frequency.
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
Decision
Conditions
Gas shortage detection I :
Input current < 1400
✕
256 (A/Hz)
✕
Compressor running frequency
✕
Voltage +180
However, when the status of running frequency > 62 (Hz) is kept on for a certain time.
Note : The values are different from model to model.
Supposed
Causes
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Indoor unit or outdoor unit heat exchanger thermistor disconnected, room or outdoor air
temperature thermistor disconnected
Stop valve closed
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