Your boiler has reverted to its original factory settings and needs to be reconfigured by a professional to match your home's specific heating system requirements.

Control mode as per delivered condition

What causes this fault?

This fault occurs when the main brain of the boiler loses touch with the display panel where you adjust your settings. The most common reason is a physical hardware failure within the control unit itself or a loose internal wiring connection that prevents data from flowing back and forth. Because the display can no longer tell the boiler what to do, the system shuts down for safety.