What does the Ariston 1 09 fault code mean?

Your boiler has detected that the water pressure inside the system is dangerously high, which can cause internal leaks or safety valve discharge.

How much does it cost to fix Ariston error code 1 09?

Typical repair cost for the Ariston 1 09 fault is £90-160 including labour.

Check that the filling loop valves are fully closed

System pressure > 3 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.