Your boiler has stopped working because it cannot communicate with its internal memory chip or the main control board is malfunctioning.

Burner blocked - Boiler coding card missing, faulty or incorrect card inserted

What causes this fault?

This fault occurs when the boiler's main brain loses its connection with the internal memory chip that tells it how to operate. The most common reason is that this small coding card has become loose, developed a hardware fault, or the main control board itself has suffered an electrical failure and can no longer read the data.