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

Typical repair cost for the boiler Fume thermostat activation fault is £120-250 including labour.

Fume thermostat activation Emergency

Boiler Fault Code Fume thermostat activation

Also written as FUMETHERMOSTATACTIVATION — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Fume 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 waste gases are not being cleared away properly, so it has safely shut itself down to prevent dangerous fumes from entering your home. (As reported on Ferroli Pegasus 67 107 2S)

Pick your boiler brand for the Fume thermostat activation fix

Ferroli Fume thermostat activation 1 model

Source

Information for the Fume 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 7 July 2026