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First the water must be hot enough - run water at the sink - is the water at least 115 degrees there ? Secondly , there must be enough water in the dishwasher - start it , let if fill and then look where the water is in bottom, it should at least touch the front lip. Third the spray arms must turn and spray the water sufficiently. Let it run after it fills and keep opening and closing the door , and each time observe where the spray arms are. Every time you look the arms should be in a different position, if they are not , they are not spraying and moving. Debris can get in the holes of the spray arms and prevent water from spraying out and this keeps it from turning.