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

Typical repair cost for the boiler Flue blockage fault is £100-250 including labour.

Flue blockage High

Boiler Fault Code Flue blockage

Also written as FLUEBLOCKAGE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 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 cannot safely leave the property through the flue pipe, causing the system to shut down for safety. (As reported on Worcester Bosch Greenstar 12i System)

Pick your boiler brand for the Flue blockage fix

Worcester Bosch 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 27 April 2026