BoilerFaultCodes E64 High
Boiler Fault Code E64
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E64 appears across 2 boiler brands and 6 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 a communication error with its internal electronics, meaning it cannot safely operate and has shut down to prevent damage. (As reported on Ariston Micro Condens)
Pick your boiler brand for the E64 fix
Source
Information for the E64 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