bb.. Low

Ariston bb.. Fault Code

Also written as BB — same fault.

The Ariston bb.. fault code means: your boiler is notifying you that the burner is currently firing specifically to heat the water inside your external storage cylinder.. It appears on 3 Ariston models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Storage cylinder, burner on (SYSTEM version)

DIY fix possible

This fault may be fixable without an engineer. Check your manual first.

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Ariston models that show the bb.. fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Ariston bb.. fault code information on this page is sourced and cross-checked against the official Ariston service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026