BoilerFaultCodes F75 High
Boiler Fault Code F75
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code F75 appears across 2 boiler brands and 10 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is struggling to detect a rise in water pressure when the pump starts, which is preventing it from firing up to provide heating or hot water. (As reported on Glow-worm Flexicom 18sx)
Pick your boiler brand for the F75 fix
Source
Information for the F75 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