BoilerFaultCodes E091 Medium
Boiler Fault Code E091
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code E091 appears across 1 boiler brand and 4 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 the main part responsible for heating your water is becoming blocked or dirty and needs a professional service. (As reported on Vokera Evolve)
Pick your boiler brand for the E091 fix
Source
Information for the E091 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