Charger shows E26; app indicates 'Time sync error' or 'RTC fault' on models with billing features.

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 Walli main board, Corrupted timekeeping firmware, Faulty RTC chip, Loss of NTP synchronization

Safety first: Timekeeping faults do not affect electrical safety.

Steps:

Check NTP settings: Ensure the Walli charger has internet access and NTP/time server settings are correct.
Manual time set: Use the Walli app or installer interface to manually set the correct date and time.
Firmware update: Apply any available firmware updates that address RTC issues.
If time drifts or resets frequently: The RTC battery or chip on the main control board may be failing. Replace the main control board or, if supported, the RTC battery module.

Medium 3/5

Walli main control board

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