BoilerFaultCodes E01-943 High
Boiler Fault Code E01-943
Also written as E01943 — same fault.
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E01-943 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 is having trouble venting exhaust gases correctly, likely because the external flue pipe configuration is not communicating properly with the sensors. (As reported on Worcester Bosch 24i RSF)
Pick your boiler brand for the E01-943 fix
Source
Information for the E01-943 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