Your boiler has detected low water pressure and is pausing operation for a few minutes to protect its internal pump from damage.

DIY fix possible

Check your boiler's pressure gauge on the front display; if it is below 1.0 bar, the system needs more water.Locate the external filling loop (a silver flexi-hose) beneath the boiler.Open the valves on the filling loop to allow water into the system until the gauge reaches 1.5 bar, then ensure valves are fully closed.