What does the Vaillant F.73 fault code mean?

Your boiler is struggling to accurately detect the water pressure inside the system because the sensor is sending an incorrect or missing signal.

How much does it cost to fix Vaillant error code F.73?

Typical repair cost for the Vaillant F.73 fault is £150-250 including labour.

Water pressure sensor signal in the wrong range (too low)

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.

Safety-critical — turn off, read this.

7 signs repair isn't worth it anymore.