Your boiler is taking a short, programmed break to prevent it from turning on and off too frequently, which protects the internal parts from unnecessary wear.

Anticycling period

What causes this fault?

This occurs when your boiler reaches its target temperature too quickly, prompting it to temporarily pause to prevent the internal components from overheating or wearing out. It is usually caused by your radiators being turned off or your heating system being too small to dissipate the heat as fast as the boiler generates it. This isn't a breakdown, but rather a protective feature to ensure the unit runs as efficiently as possible.