L.A.
Take the bottom basket out, unscrew the water blade, lift the screen down there and make sure that there really is nothing stuck down there.
There should be like a little tube down there. make sure it is all clean. Every once in a while ours gets clogged with grease. I pour boiling water down there. Put it a back together and run it empty on hot..
The other thing is to make sure that if you have a garbage disposal, that it is also all cleaned out and not plugged up. Again you can pour really hot water down there with it is running..
Hope it is something easy!