Upper tray dishes are not cleaned(washed) the bottom are OK, why?

Sounds like either the upper arm is clogged, or unable to move. Make sure nothing is in the way and that it can spin freely. Then, get lemishine machine washer (at grocery store) and run a cycle through - if it's hard water filling the holes, that'll solve it. Sounds too simple - but it actually worked for my exact machine.

Use a cap of white vinigar in the bottom of the washer before you use it.

On my d3350 it is possible to choose which tray (bottom, top or both) is cleaning.

The button is the bottom left, and above it there are two lights. As you push this button, the lghts cycle through lower tray, upper tray and the both trays. You want both lights on.

Also try this - take the spray arm out (it just snaps free) and rinse it out in case there are some blocking materials in the arm which are stopping it from spraying

The problem is hard water. There is a new product out called the dishwasher filtration system. It filters the water before it enters your dishwasher. It works amazing and has a money back guarantee. You will love the way your dishes look after the first load. It is also very affordable (like 70 bucks). Go to www.dishwasherfilter.com to find out more info.

In the back of the dishwasher at the base there is an indentation. This is where the food particals go when they are washed from the dishes. In this indentation there is a filter and a small wire appendage that is connected to the impeller of the motor. What happens is the dishwasher takes the food off the dishes and it is washed into this indentation area where the wire appendage turns breaking up the food particals to be flushed out during the drain cycle. What it souds like is this filter is clogged to the point no further waste can be flushed out. If you take the bottom tray out and reach into this indentation you will feel the filter. (note) there is a cover over this area that will need to be removed to access this filter. Once the cover is off you can reach into the area and you will feel the filter which should pull up and out. Be very carful when reaching into this area due to broken glass particles that may have accumulated. Once the filter is out clean the area well and replace the filter and you should be good to go
Hope this helped
Dave

A couple of things to confirm first
1. is the second drawer working oK - i am assuming you have a double drawer model?

2. Are you not seeing the wash cycle time on the display? why does the technician want to replace the display (LCD)?

3. Apart from replacing the rotor did the technician try to clean the dishwasher base and pump filter sump?

Please post your comments to help diagnose the cause of dirty water remaining in the dishwasher.

Check the upper arm for free spinning, then remove the arm and check that the seam between the upper and lower halves has not split somewhere. Also check all the small holes for debris plugging. Run the machine in wash cycle for a little while with the upper arm off--that should flush out anything blocking the pipe up to the arm. If still nothing from the upper arm, tear down the lower arm assembly down to the deck while noting position of all parts removed. Clean the big screen at the bottom in white vinegar and hot water. Inspect the holes in the bottom for anything blocking them.

I don't have a solution, but the exact same problem is happening with my dishwasher. Nothing is getting cleaned properly.

Did you manage to get the problem fixed?

The broken bottom arm is probably preventing any water / water under pressure to get to the upper arm.
After you replace the lower arm, you should have much better cleaning in the top shelf.
While you are in there replacing the lower arm, recommend you remove the filter under it and clean the filter and any debris you find. Be careful of broken glass!
Good Luck!

There is a screen on the drain area of the bottom of the dishwasher that needs to be cleaned. It has a plastic mesh screen on it - you can't miss it. Second get an old toothbrush and clean out the little jets on the washing arms that spin around. You will notice these holes are clogged up with calcium deposits etc. Those things done you will have a new dishwasher again. You need to do this every 6 months or so. Also use a rinse conditioner for a while to assure the jets are clean. Good Luck