What does the Saunier Duval 1 then 2 fault code mean?

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

How much does it cost to fix Saunier Duval error code 1 then 2?

Typical repair cost for the Saunier Duval 1 then 2 fault is £80-120 including labour.

Locate the filling loop (usually a silver braided hose with one or two valves) under your boiler.

The appliance will shut down if the pressure gauge indicates a loss of system pressure, i.e. less than 0.7bar.

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.