Your boiler has detected an internal electrical communication error, which means it has stopped running to prevent damage to its electronic components.

Boiler electr. system fault

What causes this fault?

This fault occurs when the boiler's internal computer brain loses touch with the sensors and controls it needs to operate safely. It is usually caused by a physical break in the internal wiring or a critical failure within the main circuit board's memory. Because the different parts of the boiler can no longer 'talk' to each other, the system shuts down as a safety precaution.