Why dishes are not cleaned on top of dishwasher but the bottom dishes are cleaned

SOURCE: kitchen aid dishwasher doesn't clean dishes in the top rack

Sounds like you have 1 of 2 problems. Either your pump is clogged or you need a bigger drain loop.

SOURCE: kitchen aid dishwasher doesn't clean dishes in the top rack

replace the top spray arm and it should work ok again

SOURCE: Kitchenaid, new dishwasher, stopped cleaning top rack dishes

The problem most people encounter with dishwashers is a simple inability to get the dishes clean. There might be stuck-on food or residue from the detergent. A water pressure problem may be the culprit. You may need to replace the water intake valve. Another common problem is mineral build-up. If your house has hard water, the mineral build-up can clog the water jets. Clear each jet with a wire or pin, and run an empty load with some vinegar in the detergent dispenser about once a month.

Sometimes, the dishwasher has problems draining properly. There could be a clog in the drain hose, or a problem with the pump. It's also possible that the dishwater is getting too sudsy, and sensors in the washer aren't detecting the soap foam as water. This causes it to shut down the drain cycle too early. Just use less detergent.

SOURCE: My dishwasher is not washing dishes on the top rack...

HI,

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 . If the motor gear is broken, replace the sump and motor assembly . Remove any debris from the sump area in the process.
You don't have to shut the power off to the dishwasher because the door will be open, but if you feel more comfortable, do so.

thanks,

SOURCE: my viking dishwasher does not rinse the soap scum off the dishes

Its not soap, its actually calcium from hard water. There is a new product out at www.dishwasherfilter.com that solves this problem once and for all. It is a small filter that goes under the sink and filters out the hard minerals that cause these spots from the water before they enter the dishwasher. It is very affordable (like 70 bucks) and even has a money back guarantee. After just one load you will be amazed how your dishes look.