Whirlpool Refrigerator Defrost Timer Reset. Remove the rear bottom panel with a phillips screwdriver or a socket wrench. Move the dial of the thermostat to the ‘off’ position.

To adjust or set the defrost timer on a whirlpool refrigerator, take the following steps: If your model has more than one thermostat at the back of the unit, as most whirlpool models. It needs to be turned until the fan stops, which means your fridge has reset the defrost button.