Daikin ALTHERMA HT ERSQ 011 AA - U2 Power Supply Insufficient or Instantaneous Failure

Troubleshooting by Indication on the Remote Controller ESIE09-08A
206 Troubleshooting
3.54 “U2 ” Power Supply Insufficient or Instantaneous Failure
Remote Control
Display
U2
Applicable Models ER*Q 011~016*
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 inverter PC board (A2P)