We have a 4000 series dishwasher. The upper arm has quit moving and water only drips from it. It is less than a year old. The dishwasher has also recently developed a high pitched sound.
Hi sounds like there is a blockage in the circulation pump which causes low water pressure as it cannot push the water around. You would have to remove the unit and turn on it's side and remove the circulation pump to clear the blockage.
Also check all the holes in your spray arms for any blockages. Best to remove each arm and clean in the sink. Any blockages causes the arms not to turn.
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