The light switch is an important component in how your fridge freezer works! This replacement Light Switch instantly turns on the lamp inside your fridge freezer once the door opens. When the door shuts, the switch's plunger is depressed so while the switch doesn't impact on how the cooling system works, it does play an integral role. If you find the light switch isn't working and the interior light is staying on constantly, then the switch will need replacing. Please check model fit list to ensure this part is correct for your model.