Table of Contents
Troubleshooting
5.23 Insufficient Gas
U0
Remote
Controller
Display
Outdoor Unit LED
A
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 < 8.78 / 256 (A/Hz) x Compressor running frequency + 0.25
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.
Gas shortage detection II :
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).
" Refrigerant shortage (refrigerant leakage)
Supposed
" Poor compression performance of compressor
Causes
" Discharge pipe thermistor disconnected, or indoor unit or outdoor unit heat exchanger
" Stop valve closed
" Electronic expansion valve defective
200
5
1
1
2
1
3
4
4
thermistor disconnected, room or outside air temperature thermistor disconnected
4
SiE12-411
Service Diagnosis
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Troubleshooting
