What does the Vaillant F22 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 Vaillant error code F22?

Typical repair cost for the Vaillant F22 fault is £80-150 including labour.

Locate the external filling loop, usually a silver flexible hose with one or two valves underneath the boiler.

Water pressure falls below 0.03 MPa (0.3 bar), the product switches off.

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.