Brand new otr microwave won't heat and carousel won't turn. Control panel does work and its not in demo mode. No buzzing or noise coming from it other than the recirc fan out the top. Advice?

William Miller

• 9179 Answers
• Posted on Dec 31, 2007

SOURCE: Sharp Carousel Microwave ESP Sensor R-1451 1.50 w 850wats has load noise and will not heat, what could be wrong?

It's probably a shorted high voltage rectifier diode.

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, and our link is at ourlisting here on FixYa: http://tinyurl.com/yzjozk

You can probably find an exploded view by entering your FULL model number here: http://www3.sears.com (the 3 is correct)

You can order Sharp parts from the Sears link above or from Tritronics at http://www.wehaveparts.com
We're happy to help and we appreciate your thoughtful rating of our answer.

If you need more help, please feel free to conact me directly through the links at our site.

SOURCE: loud humming noise

If all of your door switches check out, replace the magnatron, capacitor, and diodes.

William Miller

• 9179 Answers
• Posted on Jun 17, 2009

SOURCE: Frigidaire Microwave OTR FMV145KS2 not heating

Chances are it's a defective high voltage rectifier diode or magnetron.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.



At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
(if it's not shorted or burned, it's probably okay)

http://www.gallawa.com/microtech/mag_test.html

http://www.gallawa.com/microtech/xformer.html

http://www.gallawa.com/microtech/cap_test.html

You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.

You can download Frigidaire owner's manuals and installation instructions can be downloaded through the links here. where you can also locate a nearby authorized servicer if you choose.

The magnetron has a 10-year part warranty, but you would have to pay labor.

If nothing else, you can save about $75 by taking it to the shop yourself.

Good luck.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

SOURCE: GE Spacemaker XL1800 hum/buzz noise but heating works

were you able to replace the magnetron? Did it fix your problem? I have the same issue, and so I wanted to find out from someone who possibly tried it firsthand!

SOURCE: Dimension 4 microwave stuck on demo mode

Here are is the manual:
http://service.us.panasonic.com/OPERMANPDF/NNT888S.PDF
Page 13 tells how to shut off Demo mode. (Press FUNCTION-0-2.)

Testimonial: "Thanks very much, it was driving me crazy!!"