Daniel Prince writes:

Dan Espen wrote:

Also the suggestion about opening the door during a washing
a cycle is a good one. The arm should be turning and spraying.

The bottom spray arm only spins when the bottom rack is out. If I
put the empty rack in, the spray arm stays in the same position. (I
opened the door several times and the spray arm was always in the
same position.)

I put in an old rack from the previous dishwasher (a similar Maytag)
and had the same problem. (The middle spray arm will continue to
spin for several seconds after I open the door.)

The spray arm must be rubbing on the bottom of the rack. The ends
of the spray arms will move up and down quite a bit when I push on
them lightly. I think it must be either the spray arm or what it
rides on.

So slide the rack in and try to turn the arms by hand.
You might see what it's binding on.

--
Dan Espen