A friends Kenmore dishwasher won't drain. I removed the unit to the back porch, filled it with a garden hose and ran it through the "quick rinse" cycle and it drained fine three times. The cancel/drain feature worked fine, too. Reinstalled and ran the quick rinse cycle again, worked fine. Then ran a regular cycle with heated dry, and now it will not drain. Tried cancel/drain AND quick rinse again, still nothing. I let things cool down and tried several hours later, still not draining.

Any thoughts/suggestions would be appreciated. Thank you much.