Your boiler's internal computer has encountered a communication error or internal electronic glitch that is preventing it from working correctly.

System fault boiler electronics / basic controller

What causes this fault?

This fault occurs when the boiler's main control board experiences a breakdown in communication with other internal electronic components. It is typically caused by a physical failure within the Printed Circuit Board's circuitry or a loose connection in the wiring harness that links the sensors to the main computer. Essentially, the boiler has lost its ability to send and receive the vital data signals needed to operate safely.