How much does it cost to fix boiler error code Overheat Thermostat operates?

Typical repair cost for the boiler Overheat Thermostat operates fault is £150-£300 including labour.

Overheat Thermostat operates High

Boiler Fault Code Overheat Thermostat operates

Also written as OVERHEATTHERMOSTATOPERATES — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Overheat Thermostat operates appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has detected that it is running too hot and has automatically switched itself off to prevent any damage or safety issues. (As reported on Alpha Intec2 25 28XE)

Pick your boiler brand for the Overheat Thermostat operates fix

Alpha Overheat Thermostat operates 5 models

Source

Information for the Overheat Thermostat operates fault code is sourced from the official service / installation manual for each model that displays it. Read more about how we source fault codes →

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026