How much does it cost to fix boiler error code Blocked Flue/Condensate?

Typical repair cost for the boiler Blocked Flue/Condensate fault is £80-180 including labour.

Blocked Flue/Condensate High

Boiler Fault Code Blocked Flue/Condensate

Also written as BLOCKEDFLUECONDENSATE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Blocked Flue/Condensate appears across 1 boiler brand and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is unable to get rid of waste gases or waste water safely, which has caused it to shut down for protection. (As reported on Ideal Logic Code Combi ESP1)

Pick your boiler brand for the Blocked Flue/Condensate fix

Ideal Blocked Flue/Condensate 5 models

Source

Information for the Blocked Flue/Condensate 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