Hi, We just picked up a second hand Basestation (2016 model) that has the Thetford N3185 fridge in it. The van is plugged into mains power but the fridge doesn't turn on. I've held the button for ages and nothing lights up. I checked the power point and I can charge a mobile phone from the socket so that seams to be working. Hubby checked the fuse at the back of the fridge and it seems fine. Is there anything we're missing that we are supposed to do to get it working. thanks