E12
Vestel Backend / OCPP Communication Error

Charger displays E12; OCPP or backend connection fails and remote monitoring/billing stops working.

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Safety Warning

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.

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Possible Causes

Incorrect OCPP server URL or credentials, TLS certificate issues on Vestel communication module, Firewall or port blocking on local network, Faulty communication module firmware

How to Fix / Troubleshooting

Safety first: No special electrical risk, but always follow lockout procedures before opening the unit.

  • 1. Verify internet access: Confirm that the site’s internet connection is working and that other devices can reach external servers.
  • 2. Check OCPP settings: In the charger’s configuration interface, verify the OCPP server URL, port, charge point ID, and authentication credentials. Correct any typos.
  • 3. Firewall/port check: Ensure that the router/firewall allows outbound connections on the OCPP port (commonly 443 or 8080/8887). Adjust rules if necessary.
  • 4. Certificate validation: If using secure OCPP (wss/https), confirm that the charger’s date/time is correct and that required certificates are installed and valid.
  • 5. Reboot communication module: Power cycle the charger or, if supported, reboot only the communication module via the service interface.
  • 6. Firmware update or module replacement: If E12 persists, update the communication module firmware. If still unresolved, replace the communication module PCB.
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Repair Difficulty

Medium 3/5

Required Part

Communication Module (OCPP Interface)
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