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Door not reading as closed - KitchenAid Microwave Ovens

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This is a serious problem. The microwave oven should not work with this safegard working properly as radiation can leak out. Please call a certified repairman to resolve this issue. As this can mean the replacement of the door or other expensive parts, please ask for an estimate over the phone as to the worse scenario so as to avoid sticker shock. On the other hand, as it was in our case, it could mean a simple door adjustment (our microwave is not a KitchenAid). Good luck.

Posted on Oct 10, 2010


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Fan and light come on when door closed!

Door ailment may be a issue or the brackets that hold the switches maybe old and moving. Or wrong switch in wrong spot..

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GE JVM1790 Convection / Microwave Oven has no power except control panel

Seriously, check those door switches again (especially the top one and bottom one). Check them in place with the door both open and closed, and make sure you have continuity in 1 case (door closed) and open circuit in the other case (door open). You probably need to pull off the wire connectors to make sure you are getting an accurate reading.

Sep 08, 2014 | Microwave Ovens

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Thermador 01

make this test and fix it. God bless you

  1. Inspect the power cordUnplug the power cord and check for voltage at the outlet. Also inspect for damage, shorts, or burn marks that can be a possible safety hazard.
  2. Bad door switchIf your microwave does not work at all and you know everything is plugged in properly and the outlet is functioning, then also check the door hooks and the door release button. Using a volt-ohm meter on RX1, check your terminals. When your microwave door is closed you should have a reading of zero. Once the door is open the reading should change to infinity. If these readings do not match up, replacement of the door switch is necessary.
  3. Blown fusesTo determine if your fuse has blown out, which may attribute to your microwave not running, you need to pull the fuse out using a pair of fuse pullers. Lay it down and using a volt-ohm meter on RX1, check both ends of the fuse in question. If you do not get a reading of zero, then you will need to replace the fuse.
  4. Bad fan motorLocate the fan and remove the leads. Again using the volt-ohm meter on RX1, check the terminals. If an infinity reading is displayed, it means that the fan has gone bad and requires replacement.

Oct 25, 2013 | Thermador MBES Microwave Oven

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The microwave action not functioning, glass tray turning ok, oven light ok. Except NO heat.

The heat bulb is burned out you can look for the part at appliance parts pros . com to find your model and look to see if it is something you want to tackle. some are harder than others.

Nov 01, 2009 | Microwave Ovens

1 Answer

All appears to display....but no heating occurs. I assume not a fuse problem since all but heat working. Would a bad door switch...there are three....cause this?

You have burned micro switches in the door safety interlock system. I have answered this question dozens of times here - i am surprised this answer didnt come up when you searched your problem.

There are two reasons for the heat to not come on when everything else works ... three actually, the third is expensive.

1) the capacitor has failed - dont try to service this unless and until you understand the dangers associated with this repair.

2) burned safety door switches

3) failed magnatron (they rarely fail)

remove the cover - find the door switch. Test them. With the door closed, the switches should read closed. If they read open (because they are burned because you open the door when the oven is operating) the oven doesn't know the door is closed so it will not turn the mangatron on - no magnatron - no heat.

I hope this informaation helps you ...

If you require additinal help, post to this comment.

If you are pleased, please leave positive comments

thanks for using


Oct 25, 2009 | Sharp R-316FS Microwave Oven

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I have a Whirlpool Microwave that runs when I open the door Model# GT4175SP. Any ideas?

Remove the case and confirm that the door latch switch is mechanically intact. Next, disconnect the switch and test it with an ohm meter to see that it is actually working. It should show a short (0.0 ohms) when the door is closed and no reading when the door is open. Those readings could be reversed but there should be two distinctly different readings when testing the switch. If you don't see any differnce between readings when the door is open or closed then replace the switch. This should solve your problem.

Oct 16, 2009 | Whirlpool GT4175SPS Stainless Steel 1200...

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Tappan microwave turns on but will not heat at all....still cold after heading for several minutes.

Test your door safety interlock switches. If you are like me, you 'turn it off' by opening the door. This causes arcing at the little contact in these micro switches. Eventually, the contacts inside burn up and cannot make contact. If they cannot make contact, the machine doesn't know if the door is open or closed.

Unplug the machine - do not touch the silver thing inside - potentially lethal! - check with a volt-ohm meter. The switch should read "open" when the door is open and "closed" when the door is closed. If it reads open when the door is closed, the microwave doesn't know the door is closed so it will not turn on the magnatron.

Yes, everything else will work except the magnatron if this $10.00 switch is broken. Buy a replacement at a electronic parts or appliance place. Be ready to give make and model of your machine.

Let me know how this works for you.


Sep 13, 2009 | Electrolux Microwave Ovens

1 Answer


the microwave does not weigh things. you need to know the weight for things like auto defrost.
1 pound ground beef... enter auto defrost ..10
will read 1.0 ... 1 1/2 pounds... enter 15 ..reads 1.5.... 1/2 pound enter 5...reads 0.5 . unit beeps half way through heating program.. open door.. turn meat over close door. will continue to defrost

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1 Answer

Whirpool convection microwave not heating properly MH6150XMS

Be sure when testing these switches that they are not 'in circuit' to get a valid reading. If the monitor switch does not open when the door is closed, it should blow the fuse when the cook circuit is energized. If the secondary interlock switch does not close to zero ohms, it won't complete the circuit correctly.

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