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SiBE12-933_A
Troubleshooting
Service Diagnosis
205
4.21 Refrigerant Shortage
Remote
Controller
Display
U0
Method of
Malfunction
Detection
Refrigerant shortage detection I :
Refrigerant shortage is detected by checking the power consumption value and the compressor
running frequency.
Malfunction
Decision
Conditions
Refrigerant shortage detection I :
Power consumption < 4578 / 256 (W/Hz) × Compressor running frequency – 638 (W)
However, when the status of running frequency > 48 (Hz) is kept on for a certain time.
If a refrigerant shortage error takes place 4 times successively, the system is shut down. The
error counter is reset 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
Stop valve closed
Electronic expansion valve defective