Thermostat shows E02 and will not connect to the internet or Baxi cloud services.

Safety note: No high-voltage work is required for Wi‑Fi troubleshooting. Do not open the thermostat casing unless power is isolated.

Steps to resolve:

• 1. Check router and internet: Confirm other devices can access the internet on the same Wi‑Fi network. Reboot the router.
• 2. Verify 2.4 GHz band: Many Baxi smart thermostats use 2.4 GHz only. Ensure 2.4 GHz is enabled on your router and that the SSID is visible.
• 3. Move router or add extender: If the thermostat is far from the router, move the router closer or use a Wi‑Fi extender to improve signal strength.
• 4. Re-enter Wi‑Fi credentials: Using the thermostat menu or Baxi app, forget the current network and re-add it, carefully entering the correct password (case-sensitive).
• 5. Reset network settings: Perform a network reset on the thermostat (see Baxi thermostat manual). Then repeat the pairing process with the Baxi app.

When to call a professional: If the thermostat cannot see any Wi‑Fi networks while other devices can, the internal Wi‑Fi module may be defective and the thermostat head unit may need replacement.