What does the Vaillant F.22 fault code mean?

Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.

How much does it cost to fix Vaillant error code F.22?

Typical repair cost for the Vaillant F.22 fault is £80-150 including labour.

Locate the two small taps or the flexible silver filling loop positioned underneath your boiler.

Low water pressure: filling pressure falls below 0.05 MPa (0.5 bar).

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.