Your boiler's internal computer has detected an error in its configuration settings and needs a professional to reset internal parameters.

Parameter check. Automation settings.

What causes this fault?

This fault occurs when the boiler's control board loses or fails to recognise its specific identity and operating instructions. The most common reason is a communication failure between the main circuit board and the small plug-in 'key' that stores the boiler's settings, often caused by a power surge or an internal electronic glitch.