Your boiler is temporarily pausing between firing cycles to prevent the system from turning on and off too frequently, which protects the internal components from unnecessary wear.

Anti fast-cycle program in operation

What causes this fault?

This occurs when your boiler has reached its target temperature and needs to wait a few minutes before firing up again to prevent damage. It usually happens if your radiators are already hot enough or if the boiler is producing more heat than your system currently needs to circulate. This brief pause is a built-in safety feature designed to save energy and protect the burner from wearing out too quickly.