The Microwave Monitor Switch is an OEM part for GE microwaves. This part monitors the position of the microwave door, ensuring that the microwave does not operate when the door is open. It acts as a crucial safety feature, preventing the microwave from emitting radiation when the door is not securely closed. Causes of a bad monitor switch can include general wear and tear, repeated use, or electrical issues.   Symptoms of a bad monitor switch include: Microwave not starting or running intermittently Microwave operating with the door open Error codes or safety warnings displayed Unusual noises or sparking inside the microwave This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.WB24X10205 (AP5790849) replaces WB24X10147, 251201600930, 3025959, PS8754455.