Thermostat shows E14 and indicates an internal temperature too high; device may shut down.

Safety first: If the thermostat casing feels very hot, switch off power at the fused spur and allow it to cool.

Steps to resolve:

• 1. Check mounting location: Ensure the thermostat is not directly above a radiator, on a chimney breast, or in direct sunlight. Relocate if necessary.
• 2. Improve airflow: Make sure the thermostat is not covered by curtains, furniture, or decorative covers that trap heat.
• 3. Inspect for external heat sources: Check for hidden pipework or appliances behind the wall that may be heating the thermostat.
• 4. Reboot after cooling: Once cooled, restore power and monitor if E14 reappears.

When to call a professional: If E14 occurs even in a cool, well-ventilated location, internal components may be overheating and the unit should be replaced.