How much does it cost to fix boiler error code F41?

Typical repair cost for the boiler F41 fault is £280-450 including labour.

F41 High

Boiler Fault Code F41

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed 27 April 2026

Fault code F41 appears across 2 boiler brands and 13 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 an issue with the fan that safely clears exhaust gases, causing the system to shut down for safety. (As reported on Glow-worm Flexicom 18sx)

Pick your boiler brand for the F41 fix

Ferroli F41 10 models Glow-worm F41 3 models

Source

Information for the F41 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