Yellow L.E.D. H illuminated Emergency

Ariston Yellow L.E.D. H illuminated Fault Code

Also written as YELLOWLEDHILLUMINATED — same fault.

The Ariston Yellow L.E.D. H illuminated fault code means: your boiler has temporarily turned itself off because it is struggling to safely clear away waste gases, which could lead to harmful fumes building up if not addressed.. It appears on 1 Ariston model in our database.

Act immediately

Turn off your boiler and stop using gas appliances. Call a Gas Safe engineer now. This fault can be dangerous if ignored.

Technical description: Temporary Shutdown Due To Defective Discharge of Exhaust Fumes: safety devices automatically interrupt the gas supply due to defective discharge of exhaust products. The shut-off is temporary (approx. 15 minutes).
Typical repair cost £120-250 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Ariston models that show the Yellow L.E.D. H illuminated fault code

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

Source

Ariston Yellow L.E.D. H illuminated 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