SiAF332111E Troubleshooting by Error Code
Part 6 Service Diagnosis 293
5.55 Refrigerant Shortage
5.55.1 Refrigerant Shortage (4/5 HP Models)
Applicable
Models
RXQ4/5AR
Error Code U0
Method of Error
Detection
Refrigerant shortage check is conducted based on the discharge pipe thermistor temperature
and the low-pressure saturated temperature.
Error Decision
Conditions
Microcomputer is used to determine and check for system refrigerant shortage.
The unit can keep operating but there is an unconfirmed error.
Supposed
Causes
Refrigerant shortage or refrigerant clogging (piping error)
Defective suction pipe thermistor
Defective pressure sensor
Defective outdoor unit main PCB (A1P)
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