What does the Biasi E01 fault code mean?

Your boiler has failed to light the gas flame, meaning it has shut itself down for safety and cannot provide heating or hot water.

How much does it cost to fix Biasi error code E01?

Typical repair cost for the Biasi E01 fault is £100-£350 including labour.

Check if your gas supply is active by testing another gas appliance like a hob.

Ignition failure / 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.

Almost always a stuck diverter valve on combis.

Lockout fault with a reset-needed pattern.

Older boilers — thermocouple, draught, gas supply.