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Kenmore Elite Microwave 721.79209010 Open Door and Microwave starts running;

Unit runs normally. Appears a door interlock has failed. Open door and unit runs; close door again and it stops.

Posted by John Boerner on

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Ronald Rissel

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  • 715 Answers

Yes, a bad door interlock switch would cause this; either the top switch or the bottom switch. (The middle switch is called the Monitor switch. If it were bad, you microwave would blow fuses as soon as you press Start.)

Posted on Oct 28, 2022

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First, It is very very dangerous for a microwave to run with door open. The door is also a shield to protect you from the microwave radiation. There should be a safety interlock to prevent this from happening. DO NOT USE the microwave! Seek out professional repair or replace the unit.
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I have a Kenmore Elite Microwave Model 721.7915. When opening the door to put an item in, the microwave automatically starts without closing the door or pressing any functions. I have tried unplugging...
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Unit starts automatically when door is closed
please review this and fix it. God bless you


  1. Interlock switchIf your microwave is turning itself on, the first thing to check is the interlock switch. This is usually the first thing to malfunction that could cause this issue. If the interlock switch is bad then it will need to be replaced.
  2. Main control boardIf your microwave is turning itself on and the interlock switch is still working, the probable cause is the main control board. If the control board is defective it will need to be replaced.
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Check the door switches if one is bad it may think the door is being opened and stop the unit from running. If it is from a bad connection it will get worse as it gets hotter while running.
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Check the door safety interlock system. Remove the cover - test the little switches near the door lock.

These switches fail because we all open the oven door while the oven is operating. Thbis causing arcing and failure. When they fail, the oven doesn't know the door is closed and will not turn on the heat.

Need more help with this ...please ask.
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Do not run the microwave with the door open. You will be cooked. Sooner or later, if there are enough microwave ovens, (and there are), everything that can go wrong with them will, eventually. There are several interlocking safety systems built into every microwave so that they won't work with the door open. Yours may have failed. I've never come across one, but that doesn't mean it can't happen.
It may only have a fault making the fan and turntable operate, which can sound like it's working with the door open. Either way, get it checked or get a new one.
This assumes that the microwave isn't actually supposed to do what it is doing under normal conditions or current programming. Refer to manual/instructions if unsure.:::Spiceweasel.au
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