Hi, I just bought a new, non-plumbed Beko fridge freezer. I filled the tank with water, and, per the manual, held the lever down for 2 minutes to ‘let the air out of the system’ it made a whirring noise for a minute or so, then the noise stopped – and no water. Tried it a few more times. Still no water. Is there something wrong, or did I get a faulty machine?