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

Your boiler has failed to light the flame, which means it cannot produce hot water or heating until the issue is fixed.

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

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

Ignition Failure: This control signals an ignition failure on the burner 7 seconds after a lighting failure.

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

Almost always a stuck diverter valve on combis.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.