Thermostat displays E10 and Wi‑Fi or cloud connectivity features are unavailable.

Safety first: No high-voltage work is required, but avoid opening the thermostat housing beyond normal removal from the wall plate.

Steps to troubleshoot:

• 1. Check home Wi‑Fi: Verify other devices can connect to the same network and access the internet. Reboot the router if needed.
• 2. Reconnect Wi‑Fi: In the thermostat’s network settings, forget the current network and re-add it, carefully entering the correct password. Ensure the network is 2.4 GHz if required by the thermostat model.
• 3. Improve signal strength: If the thermostat is far from the router or behind heavy walls, consider moving the router, adding a Wi‑Fi extender, or changing the router channel to reduce interference.
• 4. Power cycle thermostat: Remove the thermostat from the wall plate for 30 seconds, then reinstall to reboot the Wi‑Fi module.
• 5. Check firewall settings: Ensure your router is not blocking outbound connections or using parental controls that could block the thermostat’s cloud access.
• 6. Replacement: If E10 persists and other devices work fine on Wi‑Fi, the thermostat’s Wi‑Fi module may have failed and the thermostat should be replaced.