My dishwasher is just 6 months old and started making a humming sound while washing in th wash cycle.

something is jammed in water pump

The wash pump and drain pump are different. So it is likely the wash pump is choked and trips or the motor is faulty.

http://www.searspartsdirect.com/partsdirect/part-model/KITCHENAID-Parts/Dishwasher-Parts/Model-KUDS02FRSS0/0593/0130000/W0602076/00008?blt=06&prst=&shdMod=#

It is likely the flap valve (item 5) or the chopper (item 6) are damaged and could be replaced before you get to the wash motor.

Sounds like you have a bearing going out. It could be in the system pump or the rotating washing arms. I would suggest getting ahold of Kitchenaid's customer support and relay when during which cycle the noise occurs and they should be able to identify whats going wrong.

Check for obstruction in drain hose.

Humming can be simply due to a mechanical vibration when the wash pump is running. Alternatively it could be the sound of the detergent door solenoid which might be stuck.
Will need make and model number of dishwasher to give further advise. Does the dishwasher complete the cycle and drain out the water?

I have the same problem as those who stated their dishes are not getting clean. If you listen to the wash cycle you should hear water sloshing around inside. If you hear just a humming sound the washer has no water. I have this problem. I had a tech come and he told me the water is syphoning out my drain and I need to change my plumbing, then he charged me $65. I have lived in this house for ten years. 6 with the washer that came with house and 4 with this Kenmore Elite. This problem started about 6 months ago. So what I have been doing is opening the door, after the humming starts and the sloshing stops, and adding about 2 L of water. It seems to wash just fine after that.

Hey, consider the float assembly!

We bought this dishwasher and ran it for the last 1 1/2 months and it made a grinding and whistling sound from day one (it's supposed to be nearly silent in its operation). Turns out the drain pump was cutting in while the machine was still filling, thereby emptying the wash tub of any water. Then, when the cycle proceeded to wash, the dumb thing had no water and made a horrible noise. So I had to pitch in at least 2-3 litres of hot water, and then it worked quietly! Had to do this every time there was new water intake.

After working with the repairmen - four visits later, we isolated the float assembly as the problem and they set about replacing the part. Turns out the two parts were markedly different. LG HAD INSTALLED an older model float assembly at the factory and it was the problem. The replacement part was the correct float assembly and things worked perfectly after that - thank goodness. No more babysitting the dishwasher.

Don't let anyone tell you the motor assembly needs replacement. I have seen that cop-out 'fix' all over the web. But use deductive reasoning to find out where the problem is in the cycle, and explore this option first - it's a quicker and cheaper fix than replacing the whole motor assembly.

'Mr. Float' as he is now called works like this:
-expels any residual water in the tub from the last wash
-intakes water for the wash or rinse
-whirs 2-3 times prepping for the cycle
-begins to wash, quietly
-expels at the end of the wash or rinse.

He used to:
-expel residual water
-intake new water for wash or rinse
---drain pump would cut in WHILE still filling
-machine would whir once, realize it didn't have enough water
-perform a brief top-up intake shot
-begin to wash and whistle and GRIND (this is where I would have to add the water)
-expels water from wash or rinse, and start all over again.

It's a good dishwasher and it will work, but the right model parts have to be in place!

it's the motor that makes the humming sound..it may have difficulty in starting..when starting like this the motor draws more current and this may cause the windings to burn out..try reducing the load..if the sound disappears then indeed the capacity of the motor is deteriorating...take out motor and clean bushing and lubricate.. also realign belt ..

There is a recall on the control board of many of these models, butyour problem is likely not related. It sounds like a plugged drain system or a possible bad drain pump. That's why you are hearing the pump running constantly. I have written a guide to help. It is here. Thanks!

sounds like a bad wash motor.