BoilerFaultCodes E01-940 High
Boiler Fault Code E01-940
Also written as E01940 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E01-940 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 that it is currently set up for a different type of gas fuel than it is receiving, which prevents it from operating safely. (As reported on Worcester Bosch 24i RSF)
Pick your boiler brand for the E01-940 fix
Source
Information for the E01-940 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