E 05 High

Boiler Fault Code E 05

Also written as E05 — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code E 05 appears across 4 boiler brands and 5 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler's internal computer is experiencing a communication error and cannot safely operate the system. (As reported on Vokera Hydra)

Pick your boiler brand for the E 05 fix

Ariston E 05 2 models Chaffoteaux E 05 1 model Ideal E 05 1 model Vokera E 05 1 model

Source

Information for the E 05 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