My dishwasher will not drain. I can hear the pump running but can't tell if the impeller is turning or not. I took off the lower spray arm and removed the filter to gain access to the pump. Nothing feels like its obstucting the pump. I could put my finger in there and touch the impeller which I tried to turn. I got it to move slightly but with one finger it was nearly impossible to move. Don't know if thats normal or not.