What does the Biasi Er 04 fault code mean?

Your boiler has detected that there is either not enough water in the system or the water isn't moving through the pipes correctly.

How much does it cost to fix Biasi error code Er 04?

Typical repair cost for the Biasi Er 04 fault is £100-280 including labour.

Check the pressure gauge on the front of the boiler; it should be between 1 and 1.5 bar.

Faulty primary circuit (no water or absence of flow)

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.