My Whirlpool Quiet Partner II dishwasher, DU1100XTPS7, will not drain. When i press the Cancel/Drain button I can hear a faint hum coming from the pump under the dishwasher. No clicks, no motor movement, nothing. Any suggestions on what to check? I already pulled the dishwasher out and pulled the hose to allow it to drain out.

Thanks for getting back to me. No blockage in the hose. I pulled the pump (part #17) and pressed the cancel/drain button. It does spin! Happy about that. Looking inside where the pump connects, I can pull up the rubber flap and still no blockage. Could there be something in the Sump (part #4) that is blocking it? If so, is it accessible from underneath the dishwasher or do I attack it from the inside under the spray arm. Thanks again.