What does the Biasi E24 fault code mean?

Your boiler has shut down because it detected it was getting too hot too quickly while trying to start up.

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

Typical repair cost for the Biasi E24 fault is £100-250 including labour.

Check that all radiator valves are fully open to allow water flow

Safety thermostat intervention during ignition phase

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.