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

Typical repair cost for the boiler Flue gas overheat fault is £150-£650 including labour.

Flue gas overheat High

Boiler Fault Code Flue gas overheat

Also written as FLUEGASOVERHEAT — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Flue gas 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 switched itself off because the internal gases have become too hot, which could damage the heat exchanger or seals. (As reported on Ideal Turbo2 24)

Pick your boiler brand for the Flue gas overheat fix

Ideal Flue gas overheat 1 model

Source

Information for the Flue gas 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