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

Typical repair cost for the boiler Flue blockage fault is £120-250 including labour.

Flue blockage Emergency

Boiler Fault Code Flue blockage

Also written as FLUEBLOCKAGE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 7 July 2026

Fault code Flue blockage 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 escaping correctly through the flue, so it has safely shut itself down to prevent harmful fumes from entering your home. (As reported on Potterton Kingfisher MF 40-100)

Pick your boiler brand for the Flue blockage fix

Potterton Flue blockage 1 model

Source

Information for the Flue blockage 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