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It would help if you provided the make and model of the dishwasher.
Most likely cause of not getting enough water pressure to top rack is the water diverter may be faulty.
Depending on the model - it is a small ball floating in a vertical channel which alternately opens and closes the bottom and top water inlets to the spray arms. Check part at Repair Clinic after selecting make & model of your dishwasher.
poor water pressure due to a clogged flowplate assy if the flowplate assy is not clogged with gook and hard water then you may need a new motor, a weak motor may not push the water well enough to get up to the top
first check entire flow are impeller etc
I had the same problem and fixed it by disassembling the lower spray arm and return filter, and cleaning all the junk out.
Most dishwashers have 'risers' that bring the water up to the top
sprayer or arm located under the top rack. If the recirculating pump
is plugged even a little there won't be enough volume or pressure to
get the water up there.
Test this by putting a dry muffin pan in the top rack, flat, and
running the dishwasher for a bit. If there is no water on the top (or
the bottom) either the top sprayer or the sprayer arm underneath the
top rack is not getting enough volume.
To fix this you need to clean out the screen and filter, where the
water returns to be recirculated. If you don't have any confidence to
remove the parts and clean it out yourself, get an appliance repair
person to do the job.
The top rack is not cleaning because of low water pressure from the wash motor to the upper spray arm. Assuming
the top spray arms are clear of debris, remove the lower spray arm to
access the wash motor. Remove the 4 torx screws and the filter
(accumulator assembly). Remove the torx screw and the inlet protector
that covers the chopper assembly. Make sure the chopper is not broken
(broken chopper will fill with debris and block water flow). While
holding the chopper blade, reach inside the "D" shaped opening on top
of the motor and spin the wheel/motor by hand in each direction to make
sure either the chopper gear or the motor gear that drives the chopper
is not broken. Replace the chopper if necessary (part # 8268383). If
the motor gear is broken, replace the sump and motor assembly (part #
8535150). Remove any debris from the sump area in the process. You
don't have to because the door will be open, but if you feel more
comfortable shutting off the power to the dishwasher, do so. Good luck!
The arm usually will stop rotateing because there is a obstuction in the arm itself you will need to remove the arm normally unclips (older machine used to scew off)When you have the arm out check all hole top and bottom and open any that are blocked rinse out arm and replace give it a wash and see if there is any improovement,let me know. Thanks
Hi: I just posted a similar problem, but found a solution. After taking the arm, etc. apart (and verifying no blockages), I thought maybe the lack of water pressure was being caused by the fact that there are TWO holes for the top spray arm (higher and lower rack setting) on my model. ie. that water was being forced out of both holes, causing a drop in water pressure, which was causing the top spray arm to stop spinning. I plugged the unused hole with a wine bottle cork (to keep the water from spraying out the unused hole), and voila, it now works.
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