BoilerFaultCodes E03 + RESET High
Boiler Fault Code E03 + RESET
Also written as E03RESET — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E03 + RESET 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 stopped working safely due to a general lockout, which means the system has detected an error and shut itself down as a precaution. (As reported on Biasi Inovia 2020)
Pick your boiler brand for the E03 + RESET fix
Source
Information for the E03 + RESET 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