E77 High

Boiler Fault Code E77

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E77 appears across 3 boiler brands 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 an issue with its internal combustion levels and cannot regulate the gas flame safely. (As reported on Warmhaus Enerwa)

Pick your boiler brand for the E77 fix

Biasi E77 1 model Keston 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 7 July 2026