Microwave, light, turntable on with door open - Appliance Repair Forum

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Model: MT4155SP	Brand: Whirlpool	Age: 1 - 5 years
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kmarkwil		#1 Posted : Wednesday, November 3, 2010 11:53:12 AM(UTC)
Rank: Member Groups: Registered Joined: 11/3/2010(UTC) Posts: 2		I have a Microwave. Oven turns on when you open the door. Light comes on and turntable turns if you open the door. If you close the door, m/w acts normal and will stop/start with the control. I think door switch but which one? There are 3. Your diagram shows 2 different numbers, but both show same part #. Are all three switches the same, or is this a mistake?....and does this problem sound like door switch? Thanks,


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Gene		#2 Posted : Wednesday, November 3, 2010 2:56:27 PM(UTC)
Rank: Advanced Member Groups: Senior Expert, Administrators Joined: 7/19/2007(UTC) Posts: 27,455 Was thanked: 4 time(s) in 4 post(s)		Most likely the problem is a bad interlock (door) switch. There are three door switches in this microwave: 2 interlock and one monitor (#2 & #3). The interlock switch has two terminals: COM and NO. The monitor switch has two terminals as well, but they are: COM and NC. The are two switches with three terminals each in the kit supplied by Whirlpool. That's why they shown with the same part number. You have to break off the terminal marked NC from the new switch and replace both of them for more reliable result. - The door switch kit Part number: AP3109474 Here are the breakdown diagrams and Latch board parts replacement parts for WHIRLPOOL MT4155SPB0 Microwave Oven 1.5 Cubic Foot \| AppliancePartsPros.com Gene.


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kmarkwil		#3 Posted : Friday, November 19, 2010 5:58:51 AM(UTC)
Rank: Member Groups: Registered Joined: 11/3/2010(UTC) Posts: 2		Ordered the door switches from you guys. They came in 2 days. Put them in today using the diagram that you supplied. A little tricky getting those stupid torx screws with the "tit" in the middle out...but read on your forums to use a small screwdriver. Once I got inside, it was obvious which switch was bad but changed them both anyway. Thanks for the help, quick reply, reasonable prices, etc. You guys ROCK. Mark Wilhelm. :) :) :) :) :D Originally Posted by: Gene Most likely the problem is a bad interlock (door) switch. There are three door switches in this microwave: 2 interlock and one monitor (#2 & #3). The interlock switch has two terminals: COM and NO. The monitor switch has two terminals as well, but they are: COM and NC. The are two switches with three terminals each in the kit supplied by Whirlpool. That's why they shown with the same part number. You have to break off the terminal marked NC from the new switch and replace both of them for more reliable result. - The door switch kit Part number: AP3109474 Here are the breakdown diagrams and Latch board parts replacement parts for WHIRLPOOL MT4155SPB0 Microwave Oven 1.5 Cubic Foot \| AppliancePartsPros.com Gene.


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