Daikin VRV S RXQ4/5ARV1 - Power Supply Insufficient or Instantaneous Abnormality

SiAF332111E Troubleshooting by Error Code
Part 6 Service Diagnosis 299
5.58 Power Supply Insufficient or Instantaneous Abnormality
5.58.1 Power Supply Insufficient or Instantaneous Abnormality (4/5 HP
Models)
Applicable
Models
RXQ4/5AR
Error Code U2
Method of Error
Detection
The main circuit capacitor voltage of the inverter and the power supply voltage is checked.
Error Decision
Conditions
The main circuit capacitor of the tested inverter has abnormal voltage or the power supply
voltage is abnormal.
Supposed
Causes
 Insufficient power supply
 Instantaneous power failure
 Defective outdoor fan motor
 Defective outdoor unit main PCB