Your boiler is temporarily pausing its burner to prevent it from switching on and off too frequently, which protects the internal parts from unnecessary wear.

Anti-cycle time

What causes this fault?

This occurs when the boiler reaches its target temperature too quickly, often because your radiators are already warm or the heating system is smaller than the boiler's output. To protect the internal components from burnout caused by constant stopping and starting, the system enforces a short rest period. It is essentially the boiler taking a 'breather' until the water temperature drops enough to start a new, efficient heating cycle.