I could not find the model on the sears site, but here is what one manual (available from this forum) says about the fill and over-fill functions:
Water inlet system (with fill switch and diaphragm) -- It insures dishwashers fill properly at various
incoming pressures. It uses a air pressure diaphragm and fill (micro) switch to alert the dishwasher
control module when the proper amount of water has filled the dishwasher.
Float switch Ė This safety feature shuts down the dishwasher and starts the drain pump if the
dishwasher has gotten excessive water in the base or has overfilled. The drain pump empties out the
sump and hoses, not the base (I.e. the drain pump isnít a base bilge pump)
Perhaps there is water in the base that the sensor is picking up, and it does not want to fill?