What does the Ferroli 12 fault code mean?

Your boiler has failed to ignite, which means it cannot heat your water or your home because it isn't getting a flame started.

How much does it cost to fix Ferroli error code 12?

Typical repair cost for the Ferroli 12 fault is £120-350 including labour.

Check that your gas emergency control valve and any boiler isolation valves are turned to the 'on' position

Boiler failed to light. Make sure that the gas isolation valve on the boiler and on the gas meter are open. Press the RESET button (2 Fig. 1).

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