H
heatherwoodSep 9, 2025
What does U2 error mean on my KingsBottle KBU-50?
- GGeorge HessSep 9, 2025
The U2 error indicates the sensor in the lower zone is short-circuit. An engineer should inspect the sensor for damage (replace if needed; it connects to the DOWN socket/plug in PCB) and check if the PCB requires repair or replacement.




