What does the Biasi E08 fault code mean?

Your boiler has shut down because the exhaust gases have become too hot, which is a safety measure to prevent damage to the internal components.

How much does it cost to fix Biasi error code E08?

Typical repair cost for the Biasi E08 fault is £120-£280 including labour.

Flue temperature probe (NTC) overtemperature

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.