E18 error; charger indicates time synchronization or clock error (on networked 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 main PCB, Loss of network connection to NTP server, Incorrect time server configuration, Faulty RTC chip

Safety first: De-energize before opening the unit.

Check network: Ensure the charger has a working Ethernet/Wi-Fi connection to the configured NTP server. Test with another device on the same network.
Update time settings: Use the Mennekes configuration interface to set the correct time manually or adjust NTP server settings.
RTC battery: If the time resets after every power cycle, the RTC backup battery on the main PCB may be depleted. Replace the battery or the PCB according to Mennekes guidelines.

Medium 3/5

Main Control PCB (RTC / Backup Battery)

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