SiBE18-821_C Troubleshooting for Outdoor Unit
Troubleshooting 409
7.24 Low Pressure Drop due to Refrigerant Shortage or
Electronic Expansion Valve Abnormality
Remote
Controller
Display
U0
Method of
Malfunction
Detection
Refrigerant shortage is detected by discharge pipe thermistor and low pressure saturation
temperature.
Malfunction
Decision
Conditions
Microcomputer judge and detect if the system is short of refrigerant.
★
The error is not decided while the operation continues.
Supposed
Causes
îš„
Refrigerant shortage or refrigerant system clogging (incorrect piping)
îš„
Defective low pressure sensor
îš„
Defective main PCB (A1P)
îš„
Defective thermistor (R3T)
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