What does the Ferroli E04 fault code mean?

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

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

Cost varies. Contact a Gas Safe registered engineer for a quote.

Locate the external filling loop, which is usually a silver braided hose connected between two valves under the boiler.

Low system pressure. Fill the system to 1-1.5 bar cold by means of the filling point C.h.

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.