Upper spray arm

Arm operates(turns) by water pressure. If it does not turn no water is going to the top spray arm. make sure the setting washer is on does not preclude the top spray arm from operating(read manual). If not check arm by spinning by hand to make sure it is free. If arm is free and it still does not turn when DW is running than there is a restriction in the tubing to the upper spray arm or the check ball or solenoid are not operating correctly.

Which one the upper or the lower spray arm? If the lower is spraying and the upper isn't.. Check the spout pipe to the upper sprayer arm, it is pluged. Or the sprayer arm is wore out around the fitting. GB...stewbison

The upper spray arm is powered by water from a tube that runs up the back of your machine on the inside. If the connection is not aligned, then the water can't get to the spray arm. My children use to knock mine out of kilter when they loaded the lower section. It's easy to see if the supports are not attached to the upper rack and a simple snap will get them back in place.
It may also be that the spray arm jets are clogged.Depending on the model, the upper spray arm generally has a nut or thumb/butterfly screw (plastic) that you remove and then remove the arm. I always soak mine in hot soapy water and then flush with hot water. If debris such as pieces of paper, bone, peelings are in there, you'll need to take a tweezer or toothpick to remove them from the jets. The upper spray arm usually has the same apparatus and you can follow the same procedure..
I hope these suggestions help your problem. If so please come back to Fixya and rate my advice!

There is a pipe/tube that runs up the back of the inside of your dishwasher. This provides water for the top spray arm. The spray arm has a feeder tube that covers the pipe in the back. If for some reason the feeder tube has come dislodged, the water just drips back down into the dishwasher, never touching your upper shelf. My kids used to jam cutting boards and other large items into the lower shelf and in so doing, would dislodge the upper spray arm feeder tube. Just pull out the upper shelf and check to see that the tube is in the correct position. This should solve the problem.
If not, then the spray arm may have debris in it that keeps the water from being forced through the jets. You'll need to flush the arm with the spray attachment on your kitchen sink. I sometimes use tweezers or a toothpick to dislodge bits of peelings, paper, or bone that manage to get into the sprayer arm.
I hope one of these tips helps. If it does,please come back to fixya and rate my answer.

There is a pipe/tube that runs up the back of the inside of your dishwasher. This provides water for the top spray arm. The spray arm has a feeder tube that covers the pipe in the back. If for some reason the feeder tube has come dislodged, the water just drips back down into the dishwasher, never touching your upper shelf. My kids used to jam cutting boards and other large items into the lower shelf and in so doing, would dislodge the upper spray arm feeder tube. Just pull out the upper shelf and check to see that the tube is in the correct position. This should solve the problem.
If not, then the spray arm may have debris in it that keeps the water from being forced through the jets. You'll need to flush the arm with the spray attachment on your kitchen sink. I sometimes use tweezers or a toothpick to dislodge bits of peelings, paper, or bone that manage to get into the sprayer arm.
I hope one of these tips helps. If it does,please come back to fixya and rate my answer.

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

Hello; first thing to check, which you don't mention, is which side of the glasses aren't coming clean; the outside, which would be caused by the TOP spray not working properly, or the INSIDE, which would be caused by the spray BELOW the top rack not working. The most common problem causing a spray arm not to turn, and/or poor cleaning, is debris blocking some or all of the spray holes in the arm. Best and easiest way to check them is to remove them; they usually are easily removed with a large wing nut or screw in the center. (Don't drop the screw, if you do it will ALWAYS find it's way to the hardest spot to retrieve it from in the whole dishwasher!)
Once you have the spray arm(s) out (this might be a good time to clean them all) you may notice pieces of debris partially protruding from the spray holes. DON'T pull them out; use something to push them back inside the spray arm. Pulling them out can enlarge and mis-shape the spray holes.
Dislodge any pieces inside the arm by firmly rapping it against a firm but padded object, and shake the debris out over the sink, catching it in a paper towel so it won't go down the drain. Be careful, as broken glass is often inside the spray arms, picked off the bottom of the tub and fed through the pump to the sprays.
Once you don't get any rattling inside after several "raps" on the padded object, the arm should be clean.
Cleaning these spray arms periodically is a good idea even before you have trouble.
Hope this helps, and good luck!
Alec

There's aspray arm at the bottom of your dishwasher--it may have a tall spray tubemounted to the center of it. There may also be a spray arm located directlybeneath the upper rack of dishes and/or above the upper rack. If debris is blocking the holes inthe spray arms where the water comes out, it could cause cleaning problems.Regularly inspect each of the spray arms and clean out the holes as necessary.

Easy to solve!
(1) Remove the drawers to give yourself room to work
(a) bottom drawer just comes right out -- but you knew that
(b) Carefully unclip small plastic retainer caps at the ends of the metal "glides" for the top drawer. Then slide the caps out of the glides. Then remove the top drawer.
(2) Unscrew the "gear-like" plastic fitting into whose hole you were sticking your finger when you felt that small cylindrical ring.
(3) Now that you've got access to the ring, the solution is obvious -- use it to snap the upper arm back into the gear-like fitting. When you're done, the arm will rotate freely in the fitting.
(4) Put everything back together and enjoy the fact that you didn't have to pay some yobbo $75 to come to your hous and do this for you!

(HINT: When screwing the gear-like fitting back into place, use the old machinist's trick of pressing gently and screwing backwards until you feel a click. The threads will now be aligned for you to screw things together the right way. If you do not do this, you might experience frustration reattaching fitting -- since the piece it screws onto is spring loaded.)

I have the DA4142 and if its anything like mine, the upper spray arm simply clips into place under the upper tray rack.