What does the Biasi E01 fault code mean?

Your boiler has failed to light the gas or cannot detect the flame, meaning you have no heating or hot water until it is reset or repaired.

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

Typical repair cost for the Biasi E01 fault is £100-280 including labour.

Check if your gas supply is active and other gas appliances are working

Ignition failure / no flame detection

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Lockout fault with a reset-needed pattern.

Almost always a stuck diverter valve on combis.

Older boilers — thermocouple, draught, gas supply.