Dishwasher runs but no water goes into the tub. First check the water line that goes to the dishwasher, then make sure the water valve is turned on. You will find the water line to the dishwasher under the sink. Check the float "see picture on left" make sure there is nothing preventing it from rising up or down freely. If it is stuck in the up position, remove any object or debris that may be preventing the float from moving freely. If the float is stuck, the dishwasher thinks that it has water in it and it will run without water. If this does not work you will need to check the water valve.