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

Typical repair cost for the boiler Safety thermostat fault is £90-180 including labour.

Safety thermostat High

Boiler Fault Code Safety thermostat

Also written as SAFETYTHERMOSTAT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Safety thermostat appears across 2 boiler brands and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has switched itself off because its internal temperature has become too hot, triggered by a safety sensor to protect the system. (As reported on Grant Vortex Blue / Vortex Outdoor)

Pick your boiler brand for the Safety thermostat fix

Baxi Safety thermostat 1 model Grant Safety thermostat 1 model

Source

Information for the Safety thermostat 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