What does the Biasi E02 fault code mean?

Your boiler has switched itself off because it is detecting that the water inside has become far too hot.

How much does it cost to fix Biasi error code E02?

Typical repair cost for the Biasi E02 fault is £100-240 including labour.

Check that all radiator valves are open to allow water to circulate

Safety thermostat intervention lockout

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.