E35 High

Boiler Fault Code E35

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E35 appears across 4 boiler brands and 11 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is struggling to detect a stable electrical signal from the mains power supply, causing it to shut down as a safety precaution. (As reported on Keston C36)

Pick your boiler brand for the E35 fix

Ariston E35 2 models ECA E35 4 models Keston E35 4 models Vokera E35 1 model

Source

Information for the E35 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