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

This primary door interlock switch lets the microwave know the door is fully closed so cooking can start. Replacing a worn or sticking switch restores reliable start/stop response and helps prevent intermittent operation tied to door-latch signaling. What it does

• Confirms the door is closed to allow the control to power the cook circuit
• Common symptoms of a failed switch: won't start, stops when the door is jostled, or only runs when pressing on the door
• Installs on the latch/door switch bracket alongside secondary/monitor switches
• Helps correct inconsistent or no response when pressing Start

• One primary door interlock switch

• Disconnect power at the breaker; microwaves contain high-voltage components that can retain a dangerous charge
• Access the latch/switch bracket, then release the switch from its clip or screws
• Move wires to the same terminals on the new switch; match orientation/actuator position
• After reassembly, verify the unit does not run with the door open and starts consistently with the door closed