E12 High

Boiler Fault Code E12

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E12 appears across 8 boiler brands and 24 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler has become too hot and has shut itself down for safety to prevent damage. (As reported on Vokera Pinnacle)

Pick your boiler brand for the E12 fix

Alpha E12 4 models Ariston E12 2 models Baxi E12 3 models Biasi E12 9 models ECA E12 1 model Keston E12 1 model Vokera E12 1 model Warmflow E12 3 models

Source

Information for the E12 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