Refrigerant Shortage - Daikin RXSQ24TAVJU Service Manual

Troubleshooting by Error Code

4.48 Refrigerant Shortage

U0
Error Code
Applicable
All outdoor units
Models
Method of Error Refrigerant shortage check is conducted based on the discharge pipe thermistor temperature and
Detection the low-pressure saturated temperature.
Error Decision Microcomputer is used to determine and check for system refrigerant shortage.
∗The unit can keep operating but there is an unconfirmed error.
Conditions
Supposed
Causes
221
Refrigerant shortage or refrigerant clogging (piping error)
Defective suction pipe thermistor
Defective pressure sensor
Defective outdoor main PCB (A1P)
SiUS331708EA
Service Diagnosis