How much does it cost to fix boiler error code Red flashing light (Flue)?

Typical repair cost for the boiler Red flashing light (Flue) fault is £100-£350 including labour.

Red flashing light (Flue) High

Boiler Fault Code Red flashing light (Flue)

Also written as REDFLASHINGLIGHTFLUE — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code Red flashing light (Flue) 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 a blockage in the exhaust pipe or a problem with the fan, causing the system to shut down for safety. (As reported on Glow-worm Compact)

Pick your boiler brand for the Red flashing light (Flue) fix

Glow-worm Red flashing light (Flue) 1 model

Source

Information for the Red flashing light (Flue) 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