Low Pressure Drop Due To Refrigerant Shortage Or Electronic Expansion Valve Abnormality - Daikin RMXS-L Series Service Manual

Troubleshooting for Outdoor Unit
7.24 Low Pressure Drop due to Refrigerant Shortage or
Electronic Expansion Valve Abnormality
U0
Error Code
Method of Error Refrigerant shortage is detected by discharge pipe thermistor and low pressure saturation
Detection temperature.
Error Decision
Microcomputer judge and detect if the system is short of refrigerant.
The error is not decided while the operation continues.
Conditions
 Refrigerant shortage or refrigerant system clogging (incorrect piping)
Supposed
 Defective low pressure sensor
Causes
 Defective main PCB (A1P)
 Defective thermistor (R3T)
209
SiUS181305E
Troubleshooting