BoilerFaultCodes E03-884 High
Boiler Fault Code E03-884
Also written as E03884 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E03-884 appears across 1 boiler brand and 2 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.
Most common meaning Your boiler is failing to communicate with its built-in internal memory chip, meaning it cannot access the configuration information needed to run properly. (As reported on Keston S30)
Pick your boiler brand for the E03-884 fix
Source
Information for the E03-884 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