E15
ABL OCPP / Backend Communication Fault

ABL wallbox displays E15; charging is blocked and the unit may show a network or backend communication error.

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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

Loss of Ethernet or Wi‑Fi connection to network, Incorrect OCPP server URL or credentials, Faulty ABL communication module, DHCP or IP conflict on local network

How to Fix / Troubleshooting

Note: This error affects networked ABL chargers using OCPP or similar protocols.

Steps:

  • Check physical network: Ensure the Ethernet cable is plugged in and the router/switch is powered. For Wi‑Fi, verify signal strength near the charger.
  • Verify IP settings: In the ABL configuration interface, confirm that IP, gateway, and DNS settings are correct or that DHCP is enabled as required.
  • Check backend URL: Confirm that the OCPP server URL, port, and credentials match those provided by your backend operator.
  • Test local access: If the charger has a local web interface, ensure it is reachable from a device on the same network.

If E15 persists: The internal communication module (Ethernet/Wi‑Fi) may be defective. Replacement of the communication board or main control board may be necessary.

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Repair Difficulty

Medium 3/5

Required Part

ABL communication module
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