What does the Ferroli E04 fault code mean?

Your boiler has stopped working because the water pressure inside the heating system has dropped too low.

How much does it cost to fix Ferroli error code E04?

Typical repair cost for the Ferroli E04 fault is £80-150 including labour.

Locate the filling loop, which is a silver braided hose connecting two pipes underneath the boiler.

Low system water pressure: Check system pressure is between 1-1.5 bar, check for leaks and the water pressure switch

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

Six most common causes of dropping pressure.

Step-by-step using the filling loop.

7 signs repair isn't worth it anymore.