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 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 electronic control board cannot read its own identity or configuration settings, meaning it doesn't know how to operate safely. (As reported on Keston K170)
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 7 July 2026