Charger shows E027; app indicates clock or time synchronization error; scheduled charging unreliable.

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

Failed RTC chip on main board, Depleted RTC backup battery, No internet time sync due to network issues, Corrupted time settings

Note: Time errors mainly affect schedules and logging, not basic charging.

Check network time: Ensure the charger has internet access so it can sync time from NTP servers.
Manually set time: Use the EVBox app or installer interface to set the correct time and timezone.
Power cycle: Reboot the charger and verify if the time holds across restarts.
If time resets or drifts quickly: The RTC or its backup battery on the main board may be failing; replace the main board or RTC module as per EVBox procedures.

Medium 3/5

EVBox Real‑Time Clock Circuit

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