Customer Questions and Answers for Microwave Door Switch (Interlock Microswitch) by Whirlpool

This door interlock microswitch detects when the microwave door is fully closed and allows the unit to run only under safe conditions. Replacing a worn switch restores reliable starting and consistent operation tied to the door latch.

• Monitors the door-latch position and completes the safety interlock circuit when the door is closed
• Helps prevent operation with the door open
• Common symptoms: microwave won't start or stops when the door is moved; requires pushing/jiggling the door to run
• Contributes to "runs but no heat" or light/fan behavior that changes as the door is opened/closed

What's included: One door interlock microswitch Install notes:

• Unplug the microwave before service; internal high-voltage components can retain a dangerous charge
• Access the switch at the door-latch assembly; transfer wires one at a time to the new switch to maintain correct positions
• Ensure the actuator aligns with the door latch and that the switch clicks freely when opening/closing the door
• After reassembly, test with a microwave-safe cup of water to ensure proper operation

Note: Many microwaves use multiple door switches; each is sold individually.