As you have to open the vent, it is a good idea to turn the coffee machine off. This is to avoid accidents. Make sure to unplug it.
Rinse the filter under the tap and dry it well. Dry the filter with a clean, dry cloth. A paper towel can leave paper residue that is hard to remove. If there is dust on the grid too, you can do the same with the grid.
Place the grid including the filter back into the coffee machine. Place the grid at the bottom first, then push the tab up to fully secure the grid. You will hear a click when the grid has been inserted properly.
Plug in the power cord. The Cafitesse Excellence Compact Black will now restart.