SiBE041029EC Troubleshooting
Service Diagnosis 62
4.6 Refrigerant Shortage
Error Code
U0
Method of Error
Detection
Refrigerant shortage is detected by checking the input current value and the compressor
running frequency. If the refrigerant is short, the input current is lower than the normal value.
Error Decision
Conditions
The following conditions continue for 7 minutes.
<RX50/60G2V1B, 71 class>
Input current
≤
A × output frequency + B
Output frequency > C
<RX50/60G2V1B9, RX50/60G3V1B, RX60G4V1B>
Input current × input voltage
≤
D × output frequency + E
Output frequency > F
If the error repeats, the system is shut down.
Reset condition: Continuous run for about 60 minutes without any other error
Supposed
Causes
Disconnection of the discharge pipe thermistor, indoor or outdoor heat exchanger thermistor,
room or outdoor temperature thermistor
Closed stop valve
Refrigerant shortage (refrigerant leakage)
Poor compression performance of compressor
Defective electronic expansion valve
A
(–)
B
(A)
C
(Hz)
RX50/60G2V1B 18/1000 0.7 55
71 class 27/1000 2.0 40
D
(–)
E (W) F (Hz)
RX50/60G2V1B9
RX50/60G3V1B
RX60G4V1B
2000/256 –181 55
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