The Primary Interlock and Door Switch is an OEM replacement part for GE microwaves. It plays a significant role in the safety and operational efficiency of the appliance. This component ensures that the microwave does not operate when the door is open, preventing exposure to microwaves. Causes of a bad Primary Interlock and Door Switch can include mechanical wear, damage due to forceful closing or opening of the microwave door, or electrical issues that affect the switch's functionality. A malfunctioning switch can lead to the microwave operating with the door open or not starting at all. Symptoms of a malfunctioning Primary Interlock and Door Switch include: The microwave operating when the door is open The appliance not starting or heating Unusual sounds during the door operation Error codes indicating door or switch issues This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.WB24X10180 (AP4484237) replaces 1556035, AH2370055, EA2370055, PS2370055.