U2" Power Supply Insufficient Or Instantaneous Failure - Daikin ERSQ 011AAV1 Service Manual

ESIE09-08
3.54 "U2 " Power Supply Insufficient or Instantaneous Failure
U2
Remote Control
Display
Subcode 20: high/low voltage problem
Subcode 21: converter problem
Applicable
All indoor units
Models
Method of
Detection of voltage of main circuit capacitor built in the inverter and power supply voltage.
Malfunction
Detection
Malfunction
When the abnormal voltage of main circuit capacitor built in the inverter and abnormal power
Decision supply voltage are detected.
Conditions
Supposed
Causes
Troubleshooting
220V. Use correct precautions when servicing.
Troubleshooting
Power supply insufficient
Instantaneous power failure
Defect of indoor inverter PC board [A4P (1
Converting problem
Warning: CAPACITOR SHOCK HAZARD. The capacitors (top surfaces) can hold up to
Troubleshooting by Indication on the Remote Controller
ø ø
) or A5P (3 )]
195