Your boiler's internal computer is experiencing a software or logic error, preventing it from processing information correctly.

System fault boiler electronics / basic controller

What causes this fault?

This fault occurs when the boiler's main control board experiences a fatal communication error or a failure in its internal data memory. It is usually caused by a physical components breakdown within the circuitry or an electrical surge that has corrupted the board's software. The boiler stops running because the 'brain' can no longer safely coordinate the heating process.