What does the Ariston Yellow L.E.D. H fault code mean?

Your boiler has detected that fumes are not being properly vented outside, so it has safely shut itself down to prevent a carbon monoxide hazard.

How much does it cost to fix Ariston error code Yellow L.E.D. H?

Typical repair cost for the Ariston Yellow L.E.D. H fault is £120-250 including labour.

Temporary Shutdown Due To Defective Discharge of Exhaust Fumes: In the event of a defective discharge of exhaust products

This is a emergency severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Six most common causes of dropping pressure.

Each noise points to a different fault.

Safety-critical — turn off, read this.