Thermostat displays E08 and cannot connect to the Immergas cloud; local control works but remote app access fails

Safety: No electrical work required.

• Step 1 – Check internet: Verify that other devices on the same network can access the internet. If not, troubleshoot your ISP or router.
• Step 2 – Router settings: Ensure your router is not blocking outbound connections or using strict firewall rules that could block the thermostat. Enable UPnP if recommended by Immergas.
• Step 3 – Time and date: Confirm the thermostat and router have correct date and time settings. Incorrect time can cause SSL/TLS connection failures.
• Step 4 – Reboot and wait: Restart the thermostat and router, then wait 10–15 minutes. Sometimes E08 clears after the device re-establishes a secure connection.
• Step 5 – Check Immergas status: Consult Immergas support or their website to see if there is a known cloud outage.
• Step 6 – Factory reset network: If the issue persists, reset the thermostat’s network settings and re-pair it with the app.