Ok i have a sq awn432sp top loading washing machine. This problem comes and goes. Now with a baby it is a problem. I go to start a load and it makes a humming noise but does not fill with water. When i disconnect the water lines from the back of the unit with the valves open there is no positive pressure or flow. Is this a plumbing or washing machine problem. My home is equipped with ips valves with mini water hammer arrestors. Help