I forgot to put the false bottom and dip tube assembly into my mash tun.
Brought the strike water up to 163 degrees, stirred in the grains, mashed for 90 minutes. Opened up the valve to drain the wort, and nothing but grains came out. I could not figure out why. Then I saw the false bottom on my work bench.
Had to scope out all the grains into my empty fermentation pales, pour the rest of the wort into the pales, then installed the false bottom. Then poured all the wort back into mash tun.Let it sit for another half-hour. Drained it.
Beer came out great.