BoilerFaultCodes E02 078 High
Boiler Fault Code E02 078
Also written as E02078 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E02 078 appears across 1 boiler brand 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 has detected that no water is circulating through the heating system correctly, causing it to shut down to prevent internal overheating. (As reported on Ariston Genus 30 Plus)
Pick your boiler brand for the E02 078 fix
Source
Information for the E02 078 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