Thermostat shows E12 and cannot connect to the Baxi cloud or mobile app even though Wi‑Fi is working.

Safety note: No mains work is required for this fault.

Steps to check:

• 1. Check Baxi service status: Consult Baxi support or website to see if there is a known cloud outage.
• 2. Test other cloud devices: Confirm that other smart devices on your network can reach their cloud services.
• 3. Router settings: Ensure your router is not using overly strict firewall settings or parental controls that block outbound connections from the thermostat.
• 4. Update firmware: If possible, update the thermostat firmware to the latest version via the app or local interface.
• 5. Re-link account: Log out of the Baxi app, remove the thermostat from your account, then re-add it using the pairing procedure.

When to call a professional: If E12 persists while other devices work and Baxi confirms no outage, contact Baxi technical support; the device may need replacement.