My old Kitchen Aid (Hobart Imperial) KDI-19 Dishwasher won't pump out (drain) water. The float switch clicks when I push down on it. The filter is clean and the drain hose is not plugged. It has power. When I turn it on I can hear the timer working and it will go through the complete cycle but nothing works. I assume it is because the tub is full...I sure would appreciate help...can't afford to replace it right now....