SiBE041102_A TroubleshootingService Diagnosis 834.22 Refrigerant ShortageRemoteControllerDisplayU0Method ofMalfunctionDetectionRefrigerant shortage detection I:Refrigerant shortage is detected by checking the input current value and the compressorrunning frequency. If the refrigerant is short, the input current is lower than the normal value.Refrigerant shortage detection II:Refrigerant shortage is detected by checking the discharge pipe temperature and the opening ofthe electronic expansion valve. If the refrigerant is short, the discharge pipe temperature tendsto rise.MalfunctionDecisionConditionsRefrigerant shortage detection I:The following conditions continue for 7 minutes. Input current × input voltage ≤ A × output frequency + B Output frequency > CRefrigerant shortage detection II:The following conditions continue for 80 seconds. Opening of the electronic expansion valve ≥ D Discharge pipe temperature > E × target discharge pipe temperature + F If the error repeats, the system is shut down. Reset condition: Continuous run for about 60 minutes without any other errorSupposedCauses Disconnection of 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 valveA (–) B (W) C (Hz)1600/256 –160 46D (pulse) E (–) F (°C)25 class Cooling 470 190/128 –7Heating 211/128 –1135 class Cooling 470 160/128 –1.5Heating 172/128 –8
