E35 High

Boiler Fault Code E35

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E35 appears across 12 boiler brands and 56 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

Alpha E35 12 models Ariston E35 2 models Baxi E35 6 models Biasi E35 3 models Ferroli E35 1 model Heatline E35 2 models Ideal E35 6 models Johnson Starley E35 8 models Keston E35 9 models Potterton E35 3 models Remeha E35 3 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 27 April 2026