Flip the circuit breaker to your Bosch SHY66 dishwasher to the “Off” position. The circuit breaker location is usually marked inside the home electrical panel box.
Remove the screws on each end of the dishwasher toe panel with a T20 Torx screwdriver. Pull the toe panel away from the base of the dishwasher.
Grab the base at each end with your hands. Pull down sharply to disengage the base from the Bosch dishwasher frame. Remove the base from the dishwasher.
Look under the Bosch dishwasher with a flashlight. The float switch is the square box on the right-front of the dishwasher. There are two wires coming from the side of the float switch. The float switch cover unsnaps for access to the wires when testing. Two screws secure the float switch to the bottom of the dishwasher.