E77 High

Boiler Fault Code E77

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E77 appears across 5 boiler brands and 25 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 an issue with its internal combustion levels and cannot regulate the gas flame safely. (As reported on Warmhaus Enerwa / Priwa)

Pick your boiler brand for the E77 fix

Alpha E77 18 models Biasi E77 3 models Heatline E77 2 models Vokera E77 1 model Warmhaus E77 1 model

Source

Information for the E77 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