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Re: Kenmore Elite Microwave 721.79209010 Open Door and...
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.)
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This is normal. Kenmore microwaves will stay running with fan and light on for a short time after food is cooked. The reason is to air out the microwave after cooking. Things like pop corn, Bacon etc. have strong smells after cooking. The ventilation helps to remove odors.
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.
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.
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.
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.
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