HomeForumsDaikinFault CodesDaikin U2 Error Code This topic is empty. Viewing 1 post (of 1 total) Author Posts July 7, 2024 at 2:37 pm #1175 TheAChubKeymaster Premium Power Supply Insufficient or Instantaneous Abnormality Error Code U2 Applicable Models REYQ-T Method of Error Detection Detect the voltage of capacitor of the main circuit in the inverter PCB. Error Decision Conditions When the voltage in the DC circuit (between diode module and power module) falls below 380VDC. Supposed Causes Abnormal power supply voltage Instantaneous power failure Open phase Defective inverter PCB Defective control PCB Defective compressor Defective main circuit wiring Defective fan motor Defective connection of signal cable Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In