The Interlock Spring is an OEM part for Whirlpool microwaves. It is located within the door assembly and provides proper tension to assist with smooth opening and closing of the microwave door. The spring allows for controlled movement that facilitates easy access when using the microwave. Causes of failure could be normal wear and tear over time, damage from rough or forced handling of the door, or failure from excessive use. Symptoms of a bad microwave spring include: Difficulty opening or closing the door The door not staying securely closed or popping open on its own Excessive vibration or noise related to door operation This is a genuine Whirlpool OEM replacement this part is also compatible with Maytag, Jenn-Air, and some Kenmore models.W10156812 (AP4409981) replaces 1454586, AH1964350, EA1964350, PS1964350.