SiBE04-809 Troubleshooting
Service Diagnosis 111
4.25 Insufficient Gas
Remote
Controller
Display
U0
Method of
Malfunction
Detection
Gas shortage detection I:
Gas shortage is detected by checking the input current value and the compressor running
frequency. If the gas is short, the input current is smaller than the normal value.
Gas shortage detection II:
Gas shortage is detected by checking the discharge temperature and the opening of the
electronic expansion valve. If the gas is short, the discharge temperature tends to rise.
Gas shortage detection III:
A gas shortage is detected by checking the difference between inhale and exhale temperature.
Malfunction
Decision
Conditions
Gas shortage detection I:
The following conditions continue for 7 minutes.
Input current × input voltage
≤
640 / 256 × output frequency
Output frequency > 55 (Hz)
Gas shortage detection II:
The following conditions continue for 80 seconds.
Target opening of the electronic expansion valve
≥
480 (pulse)
Discharge temperature > 255 / 256 × target discharge temperature +30 (°C)
Gas shortage detection III:
When the difference of the temperature is smaller than , it is regarded as insufficient gas.
If a gas shortage error takes place 4 times straight, 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
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 outdoor air temperature thermistor disconnected
Stop valve closed
Electronic expansion valve defective
Cooling
room temperature – indoor heat exchanger temperature 4.0°C
outdoor heat exchanger temperature – outdoor temperature 4.0°C
Heating
indoor heat exchanger temperature – room temperature 3.0°C
outdoor temperature – outdoor heat exchanger temperature 3.0°C
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