What does the Biasi E11 fault code mean?

Your boiler thinks a flame is present before it has even started the ignition process, which is a safety conflict that prevents it from firing up.

How much does it cost to fix Biasi error code E11?

Typical repair cost for the Biasi E11 fault is £120-300 including labour.

Parasite flame (flue detected before ignition)

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

Lockout fault with a reset-needed pattern.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.