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If is clean dishes in the upper basket, I conclude that the pump produces enough pressure what means that the lower spray arm for some reason does not rotate and because that washing result is bad. Before washing I would check the lower spray arm rotates freely and after that open the door during washing and check if the lower spray arm rotates. Sometimes, the holes in the spray arm clog and disable turning which leads to poor washing results in the lower basket.
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)
Took apart again and found the stepping motor which diverts the water from lower to upper spray arms to be burnt out. I was able to manually set the diverter to the correct position so the dishwasher works but I am waiting for new parts to properly repair the problem.
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
only the top rack isnt getting clean? there is a little plastic
circle in the middle of the bottom of the upper spray arm. turn it
counter clock wise to pull the upper spray arm from the upper rack.
make sure that isnt clogged and the spray holes are not clogged.
the piece that the bottem spray arm plugs into and
runs along the back wall of the tank to the top is called a feed tube.
pull the bottom spray arm out. now you can see the part of the feed
tube that feeds the upper spray arm water. does it pop out freely and
easily? if so then you need a new feed tube, if not then its most
likely your not achieving the right water level or your impeller
connected to your circulation pump(motor) is clogged not supplying
enough water pressure to travel up the feed tube to spin the upper