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

Typical repair cost for the boiler Flue Overheat fault is £150-£350 including labour.

Flue Overheat Emergency

Boiler Fault Code Flue Overheat

Also written as FLUEOVERHEAT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 31 August 2026

Fault code Flue Overheat 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 automatically shut down because the internal temperature around the flue exhaust has become dangerously high. (As reported on Keston Celsius 25)

Pick your boiler brand for the Flue Overheat fix

Keston Flue Overheat 1 model Worcester Bosch Flue Overheat 1 model

Source

Information for the Flue 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 31 August 2026