You have accidentally pressed the reset button on your boiler while it was already running normally, so it is just waiting for a few seconds to restart itself.

Reset button pressed by mistake.

What causes this fault?

This fault occurs when the boiler's reset button is pressed unintentionally or held down for longer than 30 seconds. The internal control system detects this long press as an error and shuts the boiler down as a safety precaution. It is often triggered by someone trying to clear a previous fault or accidentally leaning against the control panel.