How much does it cost to fix boiler error code Safety thermostat (overheat)?

Typical repair cost for the boiler Safety thermostat (overheat) fault is £120-250 including labour.

Safety thermostat (overheat) High

Boiler Fault Code Safety thermostat (overheat)

Also written as SAFETYTHERMOSTATOVERHEAT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Safety thermostat (overheat) appears across 1 boiler brand and 1 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 shut down to prevent damage or dangerous overheating. (As reported on Grant Euroflame)

Pick your boiler brand for the Safety thermostat (overheat) fix

Grant Safety thermostat (overheat) 1 model

Source

Information for the Safety thermostat (overheat) 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