What does the Saunier Duval F3 fault code mean?

Your boiler is struggling to clear exhaust gases out of the flue, so it has safely shut itself down to prevent fumes from building up.

How much does it cost to fix Saunier Duval error code F3?

Typical repair cost for the Saunier Duval F3 fault is £150-300 including labour.

Air pressure switch fault (repeated)

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.

Each noise points to a different fault.

Safety-critical — turn off, read this.