I have a Frigidaire Ultra Quiet III model FDB750RCQ0 dishwasher that I got used. The center spray arm doesn't seem to ever move. I even started a cycle with the door cracked open, and the bottom one spins and sprays, but the top one was just sitting there.
Looking at the dishwasher itself, and at the parts diagram at
ftp://ftp.electrolux-na.com/ProdInfo...5995386694.pdf, I can't tell how it ever would spin. It looks like a gravity fed funnel, about 6" from the top nozzle to the funnel that feeds the spray arm.
I tried taking the top tray outside and running water into the funnel. The spray arm sprayed water, but still did not spin.
I got started on this because the dishes on top aren't getting clean. Should I be able to see the arm spinning?
Thanks!