F16 High

Boiler Fault Code F16

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code F16 appears across 5 boiler brands and 17 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler thinks it still sees a flame even though it has commanded the burner to turn off, which is a safety concern that prevents it from restarting. (As reported on Vaillant ecoMAX Pro 28E)

Pick your boiler brand for the F16 fix

Glow-worm F16 3 models Ideal F16 3 models Intergas F16 3 models Saunier Duval F16 6 models Vaillant F16 2 models

Source

Information for the F16 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