Thermostat displays E7 and cannot connect to the home gateway or app (Eurotronic smart thermostat with gateway).

Safety: Network troubleshooting does not involve mains wiring; do not open the router while powered.

• Check local control: Verify that the thermostat still controls heating locally. If local control works, the issue is network-related.
• Restart network: Power cycle the router, Eurotronic gateway (if separate), and thermostat. Wait several minutes for reconnection.
• Verify Wi‑Fi settings: In the Eurotronic app, confirm SSID and password are correct and that the router is using a supported band (often 2.4 GHz only).
• Check firewall: Ensure the router is not blocking outbound connections required by the Eurotronic cloud service. Temporarily disable strict firewall rules to test.
• Firmware update: If possible, update the thermostat and gateway firmware via USB or local update method described in the manual.
• Replace gateway/module: If E7 persists and other devices connect fine, the Eurotronic gateway or Wi‑Fi module may be defective and require replacement.