Customer Questions and Answers for Microwave Door Switch by Whirlpool

John, You can test each switch for continuity. Look at the side of each switch. There will be lettering that say either NC= normally closed, NO = normally open, and Com which is common. If the switch reads NC and Com on the side then it will be normally open without the button being pushed and when you push the button it should read open for continuity. If the switch says NO and COM then it will be normally open for continuity when the button is not pushed and closed for continuity when it is pushed. On the switch that has 3 terminals it will have NC, NO and COM and will be closed for continuity on whichever terminal the NC is next to. One of the upper switches Primary switch will be part number W10269460 and will be the same for the bottom switch which is secondary switch. The other switch at the top will be part number W10727360 which is the monitor switch