bb.. Low

Boiler Fault Code bb..

Also written as BB — same fault.

Reviewed by the BoilerFaultCodes Editorial Team Last reviewed

Fault code bb.. appears across 1 boiler brand and 3 models. The exact meaning varies by manufacturer — pick your boiler brand below to see the model-specific fix.

Most common meaning Your boiler is notifying you that the burner is currently firing specifically to heat the water inside your external storage cylinder. (As reported on Ariston Genus Premium)

Pick your boiler brand for the bb.. fix

Ariston bb.. 3 models

Source

Information for the bb.. 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