SiUS331604E Troubleshooting by Error Code
Service Diagnosis 192
4.39 Power Supply Insufficient or Instantaneous Abnormality
Error Code U2
Applicable
Models
All outdoor units
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 invertor 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 PCB
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