Daikin FCQ18PVJU - U2 Power Supply Insufficient or Instantaneous Failure

Troubleshooting by Indication on the Remote Controller SiUS28-902_a
131 Troubleshooting
3.36 “U2” Power Supply Insufficient or Instantaneous Failure
Remote
Controller
Display
U2
Applicable
Models
RZQ18~30PVJU
Method of
Malfunction
Detection
Detection of voltage of main circuit capacitor built in the inverter and power supply voltage.
Malfunction
Decision
Conditions
When the abnormal voltage of main circuit capacitor built in the inverter and abnormal power
supply voltage are detected.
Supposed
Causes
 Power supply insufficient
 Instantaneous power failure
 Defect of outdoor unit fan motor
 Defect of outdoor control P.C.B. (A1P)