Hi there, our dishwasher starts a program, only gets a couple of minutes in and then comes up with "inlet"with a tap in the display. I've checked the inlet and the filter in it, it's fine and it is filling up with water anyway. I've had the side off and thought I could see a blockage in the plastic tank, so removed it and cleared it with compressed air. The flow wheel is turning properly, I'm stumped now. Any ideas please?