What does the Biasi E00---684 fault code mean?

Your boiler has detected that water isn't moving through the system properly, which has caused it to shut down to prevent overheating.

How much does it cost to fix Biasi error code E00---684?

Typical repair cost for the Biasi E00---684 fault is £120-£280 including labour.

Primary circuit flow switch

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.

Each noise points to a different fault.

Lockout fault with a reset-needed pattern.