I have an older Kenmore dishwasher which stopped draining. During the cycle the motor makes a humming noise and than clicks off, going to next cycle. The wash cycle works fine and all arms are spinning. Can anyone tell me if the motor is gone or just pluged somewhere. Seems like it stopped after i cleaned it with majic clean. This place has extreamly hard water. Dont want to call for service if motor is shot and not sure where to look for a plug in the drain part. It's built in, motor at the bottom with a black ring under it. Not to good in decribing techincal parts.