Your boiler has experienced an internal electrical error that is preventing it from firing up to provide heating or hot water.

Boiler electr. system fault

What causes this fault?

This fault occurs when the boiler's control system detects an inconsistency in the electrical signals required to manage the burner safely. It is usually caused by a failure in the ignition components or a breakdown in the communication between the sensors and the main control board. If the boiler cannot confirm a safe flame is present, it will stop working as a safety precaution.