Charger shows E07; communication with external energy management or smart home system fails

Safety first: Network troubleshooting is generally low-voltage, but opening the charger still requires isolating mains power.

Step-by-step checks:

• 1. Verify basic charging: Confirm that the charger can operate in stand-alone mode (without external control). If charging works locally, the issue is limited to communication.
• 2. Check physical connections: Inspect Ethernet or RS-485 connectors at the KEBA unit and at the other end (router, gateway, EMS). Ensure cables are fully seated and not damaged.
• 3. Test cable: Replace the communication cable with a known-good one. For RS-485, verify correct polarity (A/B) and termination resistors as per KEBA documentation.
• 4. Network configuration: Log into the KEBA web interface (if available) and verify IP address, subnet, gateway, and protocol settings. Ensure there are no IP conflicts on the network.
• 5. External system check: Confirm that the energy management system or backend server is online and reachable. Use ping or diagnostic tools where appropriate.
• 6. Interface board inspection: With power off, open the charger and locate the communication interface board or module. Reseat connectors and inspect for damage. If the port is physically damaged or non-functional, replace the communication interface board.

If you are not familiar with TCP/IP or fieldbus configuration, involve an IT or building automation specialist.