What does the Biasi Er04+ fault code mean?

Your boiler has detected that there is not enough water pressure or the water isn't moving through the system properly to operate safely.

How much does it cost to fix Biasi error code Er04+?

Typical repair cost for the Biasi Er04+ 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 (nowater 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.

Each noise points to a different fault.

Sludge build-up — needs flushing, not bleeding.

Six most common causes of dropping pressure.