Thermostat shows E08 and fails to join the Heatmiser Neo or cloud service

Safety first: No mains work required. Do not open the thermostat.

Steps:

• Check that your internet connection is working on other devices.
• Restart your router and any Heatmiser NeoHub or gateway in the system.
• Ensure that firewall settings on the router are not blocking outbound connections for the thermostat or NeoHub.
• Update the thermostat and NeoHub firmware to the latest versions via the Heatmiser app or web interface.
• If using a corporate or highly restricted network, move the thermostat to a standard home router environment.

If E08 continues after network checks, contact Heatmiser support as the issue may be server-side or require a firmware patch.