Thermostat or app indicates 'Overheat Protect' and heating is disabled

Safety first: Overheat conditions can be dangerous. If you smell burning or see signs of overheating, switch off power to the boiler and call a professional immediately.

• Check actual room temperature: Use a separate thermometer to verify the real room temperature. If normal, the thermostat sensor may be faulty.
• Relocate thermostat: If installed above a radiator, near a fireplace, or in direct sunlight, move the thermostat to an interior wall away from heat sources.
• Reset boiler (if safe): If the boiler has locked out on overheat, allow it to cool and reset it following the manufacturer’s instructions. Monitor for recurrence.
• When to call a pro: Repeated overheat protect events indicate a boiler or circulation fault (e.g. pump failure, blocked system) or a defective thermostat sensor and must be investigated by a heating engineer.