BMW EV charger displays E11; the unit is online but cannot connect to the BMW backend or home network.

Safety first: Network troubleshooting does not involve high voltage, but do not open the Wallbox housing.

• Check router and internet: Confirm your home router is online and other devices can access the internet.
• Verify signal strength: If using Wi‑Fi, check the signal strength at the Wallbox location with a smartphone. If weak, consider relocating the router or adding a Wi‑Fi extender.
• Re-enter credentials: Use the BMW Wallbox configuration interface (app or web) to re-enter the Wi‑Fi SSID and password or check the Ethernet connection.
• Reboot both ends: Power-cycle the router and then the Wallbox via its breaker.

If E11 persists and the Wallbox cannot be discovered on the network, the internal communication module may be defective. A BMW-authorized technician can replace the communication board or main control board as required.