What does the Biasi E20 fault code mean?

Your boiler has stopped working because it cannot detect a steady gas supply or there is a communication error with its internal control board.

How much does it cost to fix Biasi error code E20?

Typical repair cost for the Biasi E20 fault is £180-£450 including labour.

Main electronic p.c.b., Gas supply line

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.

Older boilers — thermocouple, draught, gas supply.

Safety-critical — turn off, read this.