BoilerFaultCodes E03-894 High
Boiler Fault Code E03-894
Also written as E03894 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E03-894 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 detected an issue with the air supply adjustment required for liquid petroleum gas (LPG) operation, preventing it from heating safely. (As reported on Keston K170)
Pick your boiler brand for the E03-894 fix
Source
Information for the E03-894 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