Lay it on it's side. Take the floor tray off. Get a flat screwdriver and turn the end of the wash pump shaft to see if it is easy to turn. If it is free to turn check the capacitor if you have a multimeter, The value will be printed on the side. If value is low or you have any doubts then replace it.
Lincoln Appliance NZ
May 2017
Cheers!
FA
May 2017
If it hums then probably needs a new motor start capacitor fitted or else the wash pump is jammed or seizing up.
Lincoln Appliance NZ
May 2017
I can answer this question...
Baumatic BAD6002 dishwasher won't start after filling with water?