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 2 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.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like bb..: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

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 31 August 2026