What does the Saunier Duval 09 fault code mean?

Your boiler has lost track of the water pressure inside the system because the internal sensor is failing or sending an incorrect signal.

How much does it cost to fix Saunier Duval error code 09?

Typical repair cost for the Saunier Duval 09 fault is £120-£200 including labour.

System pressure sensor fault

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.