BoilerFaultCodes E04.00 High
Boiler Fault Code E04.00
Also written as E0400 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E04.00 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's internal computer is experiencing a software memory error, meaning it has lost critical safety settings required to operate. (As reported on Remeha Quinta Ace 30)
Pick your boiler brand for the E04.00 fix
Source
Information for the E04.00 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