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There should be an upper spray arm to wash the upper rack, it may be stuck. Look at its position, run the machine a few seconds and see if it moved. The spray nozzles on the arm often get clogged with food particles. the pipe feeding the spray arm has to extend when you pull the rack out and retracts when you push it in. Make sure it works properly and has not disconnected.
On my dishwasher, this arm attaches with a huge gray plastic screw. If it comes loose, you'll usually find the spray arm sitting in the bottom rack, but the screw falls down to the bottom of the tub.
The spray arm has a hole that goes all the way through its center. One of these holes is larger than the other, so the arm will only attach in one direction. Most of the spray holes on the arm face "up" when installed.
Slide out the upper rack, position the spray arm on its pivot, then insert the screw and turn clockwise to tighten it. The arm should spin freely.
If this arm isn't attached, none of the dishes will wash well (due to a loss of water pressure).
Check your upper wash arm.... check the holes, especially the ones at the end of the arm. Are they possibly clogged with debris or hard water? This is the usual cause of dishes on the top rack not getting clean. The holes at the end of the wash arm are angled to eject the water at an angle to use the reaction to push the wash arm around. If those holes are clogged, then the arm won't rotate, and only those few dishes or glasses right under the arm will get clean, and the remaining 80% of the dishes on the upper rack won't get clean!
If there is no blockage, your pump may need to be rebuilt or replaced. If your machine uses a solenoid valve to control weather the pump is washing or draining. The drain valve may be stuck somewhat open, diverting wash water down the drain. Or the wash valve may be not opening fully. Different machines work in different ways.
Your sprayer arms may be clogged. The upper arm attaches to a tube in the back of the dishwasher. If the support clamps come loose, the upper spray tube will not be flush with the tube and can't carry water to the sprayer arms. Also the sprayer arms can become clogged with paper remnants, bone fragments, or pieces of peeling. You'll need to remove the sprayer arm and flush it at your sink. If there is a jet that is clogged, tweezers will help remove the residue. Finally, the bottom of the door INSIDE the washer often get covered with gunk. Be sure and gently wash the bottom of the door INSIDE. You can open the door, spray some window cleaner on the bottom and then gently brush away the 'gunk.' Rinse with hot water from a pitcher or your sink sprayer and this can eliminate some of the residue that is showing on your dishes. I hope this helps. If it does, please come back to Fixya and rate my answer
Possible causes of spray arm inefficiency: Loading large or tall items in the lower basket which stops the arm revolving. Upper spray arm split along seam. Upper spray arm blocked. Under dosing of powder causing foam and reducing upper spray arm water pressure. Blocked strainers reducing water to circulating pump, therefore reducing upper spray arm water pressure. inefficient wash motor impellor (faulty)
maybe not... if unit is incorporating more than one spray arm,chances are the upper spray arm is not getting water.pull top rack forward,gaze under top rack near rear manifold.slowly push rack back in.notice if manifold inserts into upper wash feed.if so,possible motor issue. if not,bingo was his name-o!
ok so If your dishwasher has worked fine in the past but, suddenly, your
dishes aren't clean after the dishwasher completes all cycles: 1) Check your water heater's temperature dial to
be sure it hasn't been changed recently. 2) Be sure dishes haven't prevented the detergent
dispenser from opening properly during the wash cycles or kept the spray arms
from turning, the lower arm from rising, or the spray from reaching the upper
rack's dishes. 3) During the wash cycle, listen to the spray arm
spinning inside. If it seems to be spinning poorly, clean out the spray holes
in the spray arm(s) with a stiff piece of wire; wait for the machine to cool,
and then remove the spray arm(s) by unscrewing the hub cap and lifting the
arm(s) off RegardsGizokieth
If you want to see if water is getting to the upper spray arm you can open the door while it's washing for a quick look before it stops or if you can manually press in the door latch with the door open you'll get a good look. You'll also get water in your face. It's probably a pump problem. The vanes in the pump can get damaged which means the pump can't push the water to the upper arm.