BoilerFaultCodes AF Low
Boiler Fault Code AF
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code AF appears across 1 boiler brand and 3 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 itself on to prevent the internal pipes from freezing. (As reported on Vokera Mynute 10E)
Pick your boiler brand for the AF fix
Source
Information for the AF 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