What does the Ariston L.E.D. I (Red) fault code mean?

Your boiler has automatically turned itself off because the internal water temperature has become dangerously high.

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

Typical repair cost for the Ariston L.E.D. I (Red) fault is £150-300 including labour.

Overheating: This control shuts off the boiler in the case where the primary circuit reaches a temperature in excess of 105°C.

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

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.

Safety-critical — turn off, read this.