Top rack not cleaning dishes. model # FDB1050RES2

Most dishwashers have a rotating spray bar underneath the upper rack. Over time bits of food can clog up the holes and then dishes won't get clean in the upper rack. Check to make sure all the holes in the spray bar are clear and that it is rotating freely.

the water tube may be clogged at the sprayer on the top of the basin. probably have to disassemble and clean

I’m happy to assist further over the phone at https://www.6ya.com/expert/howard_977676954994c5b2

Hi,
Here is a tip that I wrote about your problem...

http://www.fixya.com/support/r4319937-dishwasher_maintenance

heatman101

Possible that the motor impeller has good particles in it, causing poor water pressure, which would be most evident on the top rack. You would have to remove the spray arm, then the filter, then the torx screws to get at impeller....unfortunately, that model of dishwasher isn't the greatest in the first place for washing, since it only has the one spray arm.

When the dishes on the top rack are not getting clean the most common problem is that the water supply hose in the rear of the top rack is misaligned. With the rack empty, pull out the rack and look in the rear where the supply hose slides into the water supply. Often a plastic clip or two has come apart. Realign everything and it will work fine. If you need a diagram go to sears direct parts where they have an excellent website. Enter your model number and you will be able to see a schematic showing each part and how they go together. Joe

please rate my answer as very helpful. thank you.

http://www.kitchenaid.com/assets/pdfs/product/ZUSECARE/8573754.pdf
I know this isnt the same model, they dont carry your manual as of yet. But it does have some suggestions to look at on page 17. I had the same problem and I looked really carefully and found my sprayer arm was blocked. I cleaned it out and havent had a problem with it again. I do check it regular now.

I'm having the same problem. Did some testing and found that the sprayer on the top rack is not even moving and hence not getting any water. Not sure what to do.

likely not .....the problem may be how you stack the dishes ....try doing a load with nothing on the bottom rack ....if the top rack items come clean then you may be stoping the water from reaching the top rack with the dishes on the bottom rack ....it's important to keep the center of the bottom rack free this is where the water comes from (on most models). to clean your upper rack .....have a close look at the inside of the machine to try and figure out where the water comes from ...it helps a lot to understand this ....good luck

replace the top spray arm and it should work ok again

MAYTAG MODEL MDB7160AWB DISHWASHER
fills,starts wash cycle and shuts down about 2 min. into cycle