How to test the pressure switch of my Hoover washing machien HNL6146?

We think the switch of my Hoover washing machien HNL6146 is not working - we tested it but cannot interpret the result : Test1 : terminals 1 -1, 1-2 amd 1-3 do not have any current between them. Test 2 When we blow there is a sinlge click. What's worse we the switch for this three year old machine has been discontinued as a spare part. Is the Candy for HBL 6147 really going to work as a replacement,.