What does the Biasi E24 fault code mean?

Your boiler has shut itself down because it detected that the internal water temperature has become too hot to operate safely.

How much does it cost to fix Biasi error code E24?

Typical repair cost for the Biasi E24 fault is £90-180 including labour.

Check that all radiator valves are fully open

Safety thermostat intervention during burner operation

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.

Work through these before the call-out.