Charger shows E20; may indicate a time or clock synchronization error on smart models.

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

RTC battery failure on control board, Corrupted time settings, Firmware bug affecting scheduler, Loss of network time sync

Safety first: Ensure the charger is idle before changing settings.

Manually set time: Use the front panel or app to set the correct date and time on the charger.
Disable schedules: Temporarily disable any delayed charging schedules or time-of-use settings to see if charging resumes.
Firmware update: Update to the latest firmware, which may fix RTC or scheduling bugs.
If E20 persists: The RTC circuit or backup battery on the control board may be defective. Control board replacement is typically required.

Medium 3/5

Main Control Board

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