Your boiler’s internal computer has encountered a communication error or internal glitch that is preventing it from running properly.

System fault boiler electronics / basic controller

What causes this fault?

This fault occurs when the boiler's main control board loses its ability to communicate with other internal electronic components. It is typically caused by a data error within the software or a physical failure of the circuitry that manages the boiler's core operations. Think of it as a computer crash where the hardware can no longer process the instructions needed to keep the system running safely.