Using this Whirlpool door interlock switch is simple. First, make sure your washing machine is unplugged to avoid any electrical hazards. Then, carefully remove the old switch and replace it with this new one, connecting the terminals as they were on the old switch. When using the washing machine, ensure the door is properly closed so the switch can work effectively. As for maintenance, keep the switch clean and dry. Avoid getting water or other liquids on it. If you notice any issues like the door not locking or unlocking properly, check the connections first. If the problem persists, it might be time to contact a professional.