I have a Frigidaire dishwasher that will fill up with water then it just hums, but no water circulates. When I shut it off it drains the water fine. Any help would be appreciated. Thanks in advance.

I ordered these parts from appliancepartspro and am still having problems. The upper arm does not spin. I ran it with the door open and water come through the top rack, but the arms don't spin. I ran it on upper arm only and the water flow does switch from the lower to upper arm. There is a heavy stream of water coming down into it. I have cleaned out the spary arm and verified water is coming out all the holes. Any help??

When the forum is busy as it always is just before Xmas the regular posters do not have time to look at all posts so they do not look at posts where they see another regular poster has replied.
You may want to start a new post with what you have done so far etc.

Without being there I am pretty well out of ideas.
The unit seems to be washing OK and you have water to the top arm and it spins easily so I am stumped.

You may want to try adding a couple quarts of hot water to the unit after it fills to see if it will then spin the arm.
Just be careful to not overfill it.
My thinking is that it may be the pump is starving for water (cavitating).
Though usually you can hear this and you did not mention a noisy pump.

If it does run OK then the most likely cause is a dirty filter screen on the input side of the water valve.
Remove the valve from the unit and clean the screen.
Do not permanently remove the screen from the valve as it is there to keep crud out of the valve. This could hold the valve open and cause a flood.