I've just bought a second hand Swan SDW2011B dishwasher. After connecting it to the water mains I decided to try it and run an empty washing cycle. When turned on I can hear the water outlet pump running, followed by the water inlet pump letting water in. It then starts the washing cycle itself, and I can hear water coming out from both rotating arms (also, if I open the door during this stage I can definitively see water inside the machine). It continues for a couple of minute, then the water drains out, the inlet pump starts running again but there's no water coming in. After that, the start/pause LED flashes; according to the manual, that means there's no water coming in.
I am baffled at how this is happening, since the inlet pump does work fine for the first water in cycle. I've obviously checked the water inlet hose and filter and they're all clear; after all, at some point the is water running through them. Any ideas of what it could be?