BoilerFaultCodes E25 425 High
Boiler Fault Code E25 425
Also written as E25425 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E25 425 appears across 1 boiler brand and 1 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler has automatically turned itself off because it has detected that it is getting significantly too hot, which is a safety protection step. (As reported on Ariston Excalibur)
Pick your boiler brand for the E25 425 fix
Source
Information for the E25 425 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