The Interlock Switch is an OEM replacement part for GE microwaves. It acts as a safety device that prevents the microwave from operating unless the door is securely closed and latched. The switch monitors the door position and communicates with the main control board to allow or cancel cooking functions. Causes of failure may include damage from excess heat over time or wear from repeated door openings and closings. Failures can compromise safety if the microwave operates unexpectedly while open. Symptoms of a bad interlock switch include: Microwave can be turned on even when the door is open      Error codes displayed related to door issues   Inconsistent or faulty communication with the control board This genuine OEM replacement part is also compatible with GE, Hotpoint, and select Kenmore microwave models.WB24X824 (AP2024332) replaces 253814, AH237416, EA237416, PS237416, WB24X0824.