BoilerFaultCodes FLASHING F Low
Boiler Fault Code FLASHING F
Also written as FLASHINGF — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code FLASHING F 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 very cold temperatures and has automatically turned on its high-level frost protection mode to prevent the internal pipes from freezing. (As reported on Gledhill GB35C)
Pick your boiler brand for the FLASHING F fix
Source
Information for the FLASHING F 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 7 July 2026