BoilerFaultCodes 226 Low
Boiler Fault Code 226
Reviewed by the BoilerFaultCodes Editorial Team Last reviewed
Fault code 226 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 is noting that a professional diagnostic tool has been plugged into it; this is an informational record rather than a sign of a mechanical failure. (As reported on Worcester Bosch Greenstar i)
Pick your boiler brand for the 226 fix
Source
Information for the 226 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