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

Typical repair cost for the boiler Safety thermostat activation fault is £150-300 including labour.

Safety thermostat activation High

Boiler Fault Code Safety thermostat activation

Also written as SAFETYTHERMOSTATACTIVATION — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Safety thermostat activation 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 dangerously overheating because the water is failing to flow through the system as it should. (As reported on Ferroli Econcept 100)

Pick your boiler brand for the Safety thermostat activation fix

Ferroli Safety thermostat activation 1 model

Source

Information for the Safety thermostat activation 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