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Microwave oven runs with door open

The microwave runs with the door open. Goes off as usual when the door is closed, but when door is opened the light goes on and the turntable rotates. We don't know if the microwaves are activated when this happens. The oven works normally when door is closed and time/power are programmed in. It stops at the end of program, but when you open the door, it comes back on.

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  • TDGooldy Dec 15, 2008

    I have the same problem with a GE Spacemaker XL1800. I talked to GE and there are two door switches. Which one is likely to be causing this problem and should be replaced on this, the primary or secondary?

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  • Microwave Ovens Master
  • 8,820 Answers

This is usually caused by either a bad door switch, a loose door switch mount.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

If you someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

Please feel free to contact me directly if you need more help.

We're happy to help and we appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Posted on Apr 18, 2008

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SOURCE: Frigidaire FMT 148GP Microwave oven. Turntable

1. the motor to rotate the glass table in the micro wave may have stop working or the switch to the motor is defective.

Posted on Mar 13, 2010

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1 Answer

Microwave keeps running with door open


I'd say the door interlock switch has failed, and supplies a connection when it should not. Microwave ovens can be dangerous to anyone poking around inside, even when unplugged, so get a quote from a service tech. You might find that parts+labour is almost as much as a new one.

Microwave radiation being released through an open door is also a hazard, as it is known to cause eye cataracts, so don't get near if the oven does this.

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This is usually a defective or loose bottom door switch or that switch's mount is loose, misaligned or broken.
It's usually caused by opening the door while it's cooking instead of hitting "stop" first) or slamming the door or both.
My help file on door switches is here.

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Check the door switches with digital meter, usually find one bad one. Set meter to ohms and test, some will be normally open and others closed, check with the door open and closed.

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Every time I open the door to the microwave, it goes on automatically. Even if I press the button on the door, the microwave goes on. Should I just buy a new one, or is it an easy fix?


most likely the door latch assembly and or the door switch has failed... there are approx. 3 micro switches located where the door closes... these switches all operate items such as the cooling fan,timer, clock assembly etc... sounds like one of these micr switches have failed and will require getting inside to exam with a meter and check contuinity on close and open when switch is open...good luck to you...

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Turntable goes around when the door is open and the microwave is off.


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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If it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

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It works even if I open or close the door.


if thats a microwave.. then the sensor of the closed door is broken.. thats why it worked even when open.. and that is really dangerous...
so.. your best bet would be opening it and find the broken thing that tells the microwave when its closed...

that thing is usually the little secures attach to close the oven..

if its not a microwave, the problem might still be something similar to this..

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