F24 High

Boiler Fault Code F24

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code F24 appears across 4 boiler brands and 20 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is overheating because water isn't moving through the system fast enough, causing it to shut down to prevent damage. (As reported on Glow-worm Flexicom 18sx)

Pick your boiler brand for the F24 fix

Glow-worm F24 9 models Heatline F24 8 models Saunier Duval F24 1 model Vaillant F24 2 models

Source

Information for the F24 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