Hold either side of the dishwasher's bottom front panel, which is located right above the ground. Pull each side of the panel forward with your hands. The panel will pop off.
Locate the dishwasher thermostat. It is a small round device located next to the timer. The thermostat is about 2 inches in diameter and has different colored wires coming out of its sides.
Press the button on the underside of the thermostat and hold it for 10 to 15 seconds, then release it. This button will reset the thermostat to factory settings.
Place the panel back on the dishwasher.