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First thing you want to do is make sure the spray arms themselves are o.k. The ports are not clogged and there are no cracks. Once you are satisfied this is not the problem, check the seal ring on between the lower spray arm and the spray arm support on the pump. See if it is out of position or damaged. Make sure the water level is not too low, should just come in contact with the bottom of the heating element. Next check your filters, look for garbage, plastics, anything that would clog it. Last would be the pump itself. Ron
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You are right to go to the inlet filters. If they are clogged you would lose pressure, but not that much...The pressure pump is probably not outputting any longer. Locate it and see if it is moving freely.
Make sure that that upper arm is free to turn. Check it while you have dished installed, because sometimes, dishes on the lower rack may stick up too high and hit it. Otherwise, check the back of the water-supply tube attached to that upper rack.... Is it lining up with the water feed port or hole at the backof the dishwasher? Is there a gasket that is either ripped or missing? And check that wash arm carefully.... Might it be split or bent? Are the holes on the bottom clear? (Those holes are usually angled to push the arm around; if they are clogged, the arm won't rotate.)
I had the same problem I own a Kenmore Elite dishwasher. Diverter motor needs to be replaced. The diverter motor is connected to a plate that controls the flow of water to each washer arm. When the plate moves it has holes that align to the proper tube that supplies water to a washer arm. When the diverter motor is broken it is unable to rotate and cannot direct flow of water. When this happens water will only be able to come out of one spray arm in my case the back sprayer or turbo wash. The diverter motor is located under the dish washer and the diverter plate is located under the bottom sprayer arm.
Position the spray arms in a certain position. Activate the dishwasher for a few seconds and then examine the position of the spray arms. If the upper spray arm has not moved, then either there is no water coming to the spray arm or the spray arm is clogged.
replace the washer water from bottom of the unit up to the top arm water feed assy,they get worn and water leaks by the hub arm that pressurizes the upper wash arm,this is also true on the center arm if the washer has one
check water going into unit. disconnect to make sure there is a strong pressure going through.
check the water valve with a meter if there is continuity the valve is good. if not the valve is bad a no water water will go through. let me know if this helps
Check the upper arm for free spinning, then remove the arm and check that the seam between the upper and lower halves has not split somewhere. Also check all the small holes for debris plugging. Run the machine in wash cycle for a little while with the upper arm off--that should flush out anything blocking the pipe up to the arm. If still nothing from the upper arm, tear down the lower arm assembly down to the deck while noting position of all parts removed. Clean the big screen at the bottom in white vinegar and hot water. Inspect the holes in the bottom for anything blocking them.
The broken bottom arm is probably preventing any water / water under pressure to get to the upper arm.
After you replace the lower arm, you should have much better cleaning in the top shelf.
While you are in there replacing the lower arm, recommend you remove the filter under it and clean the filter and any debris you find. Be careful of broken glass!