Ok either way it sounds like the pressure switch this is what activates the wash cycle when its filled up. You will need to pop the top on the washer you do this by taking a putty knife and sticking it into the top where the top meets the cabinet where the slit is at go about 2 inches in from the sides and push in the putty knife to release the top do this to both sides then lift up, then you will see this pressure switch it will have a little hose going to it plus you will see some wires going to it thats the pressure switch hand on and i will get a picture for you.
This is the pressure switch.
If you go here its number 6 on the diagram its pretty expensive and also there are alot of parts on this unit that are dis-continued.
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