E20 error; charger indicates a time synchronization or clock error affecting scheduled charging.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Depleted RTC backup battery on control board, Loss of internet time synchronization, Firmware bug in scheduling logic, Faulty RTC chip

Safety first: Time settings can be adjusted without opening the charger; internal work requires power OFF.

Disable schedules: Temporarily disable scheduled charging and attempt an immediate charge to confirm basic operation.
Check internet time: Ensure the charger has a working network connection so it can sync time from NTP or cloud services.
Manual time set: If supported, set the date and time manually via the app or display.

If E20 recurs and the charger loses time after power cycles, the RTC battery or chip on the main control board may need replacement.

Medium 3/5

Main Control Board

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