The Micro Switch is an OEM part for GE microwaves. This part ensures the appliance operates only when the door is securely closed. It controls the electrical circuit, allowing the microwave to start heating food when the door latch engages the switch. Causes of a bad micro switch can include wear and tear from frequent use, electrical issues, or physical damage from slamming the microwave door.   Symptoms of a bad micro switch include: The microwave not starting or stopping unexpectedly The microwave running even with the door open Intermittent power issues The door not latching or the microwave indicating the door is open This OEM GE part is also compatible with Hotpoint, RCA, and some Kenmore models.WB24X10146 (AP3866977) replaces 1166990, AH1019163, EA1019163, MW-7100-33, PS1019163, WB24X28941.