What does the Biasi E04 fault code mean?

Your boiler has detected that there is either not enough water pressure in the system or the water is not moving through the pipes as it should.

How much does it cost to fix Biasi error code E04?

Typical repair cost for the Biasi E04 fault is £100-£350 including labour.

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

Pump circulation failure or primary circuit pressure low fault

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.

Sludge build-up — needs flushing, not bleeding.