the dishwasher cycles correctly, except during circulation. when it gets to that point, nothing happens. I checked the circ pump and it seems ok, I checked the circ motor, and it has power coming to its terminals. The circ spray arm does not spin, as it needs water to pump through it. When the water initially fills, at the start of the cycle, it only fills to 2inches in the the dishwasher basin, and I do not know if this is normal, or too little water. I think it is either an interlock switch that does not allow the motor to turn on, due to water level or temperature, or it is the circ motor. I never smelled the motor burning out. Any Ideas? If it is the motor, it there a way of replacing it without having to eintirely remove the dishwasher from under the counter?