How much does it cost to fix Ariston error code Red L.E.D. B?

Typical repair cost for the Ariston Red L.E.D. B fault is £100-300 including labour.

Red L.E.D. B High

Ariston Red L.E.D. B Fault Code

Q: What does the Ariston Red L.E.D. B fault code mean?

Your boiler has failed to ignite and has locked itself out for safety reasons, meaning you will not have any heating or hot water until it is reset.

Also written as REDLEDB — same fault.

The Ariston Red L.E.D. B fault code means: your boiler has failed to ignite and has locked itself out for safety reasons, meaning you will not have any heating or hot water until it is reset.. It appears on 6 Ariston models in our database.

Technical description: SHUTDOWN DUE TO THE FAILURE OF THE BURNER TO LIGHT AUTOMATICALLY. This anomaly is indicated by the red “B” L.E.D. To reset the unit, press and then release the “A” button.

Typical repair cost £100-300 (including labour)

DIY fix possible

Locate the reset button 'A' on the control panel.Press and release the reset button to see if the boiler restarts.Check if your gas supply is active by testing other gas appliances like a hob.

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Ariston models that show the Red L.E.D. B fault code

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

Source

Ariston Red L.E.D. B 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