What does the Alpha 12 fault code mean?

Your boiler has detected that the internal water pressure has climbed too high and triggered a safety valve to release water to prevent damage.

How much does it cost to fix Alpha error code 12?

Typical repair cost for the Alpha 12 fault is £120-250 including labour.

Pressure relief valve

This is a emergency 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.