What does the Biasi Operation lights flashing fault code mean?

Your boiler is starting up briefly but then switching itself off because it is struggling to safely expel waste gases or drain excess condensation.

How much does it cost to fix Biasi error code Operation lights flashing?

Typical repair cost for the Biasi Operation lights flashing fault is £100-280 including labour.

Check the white plastic condensate pipe outside for signs of freezing or blockages

The boiler lights for a short while in c.h. mode (Condensate drain pipe and trap / Air pressure sensor / Flue pipes defect).

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

Six most common causes of dropping pressure.

Each noise points to a different fault.

Safety-critical — turn off, read this.