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Crystal microwave oven model WP900AP23 does not heat up.

Display exhibits all of the modes according to existing functions, plate is rotating but any heat...

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  • levtch Dec 13, 2008

    Hello.

    First of all, thanks for quick response.

    It is right: there are light inside, turntable rotating and display panel responding appropriately to demanded function, but it is not heating. Any unusual noise is not detected (the same noise as during normal operation in the past).

  • levtch Dec 18, 2008

    Hello.

    First of all thanks again for your support.

    Right now I have found out a bad high voltage fuse and disconnected in both direction high voltage diode. So, I am going to purchase these parts and replace it (I will update you about results).

    Unfortunately I have not idea how I can check the magnetron.



    Thanks and Best Regards,

    Lev.

  • William Miller
    William Miller May 11, 2010

    Your post got cut off.

    Do you mean to say that when you try to microwave, the inside light and turntable operate, but it's not heating?

    Any unusual noises? Is
    it louder or quieter than usual?



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  • Microwave Ovens Master
  • 8,820 Answers

With the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode, a bad magnetron, or a bad high voltage diode.

If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.

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, it's probably okay)

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

You can contact your manufacturer about parts by consulting the contact information in your owner's manual.

If you have no manual, I would suggest calling the dealer where you bought it to see if they have a number for the mnaufacturer.

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

Posted on Dec 15, 2008

  • William Miller
    William Miller Dec 19, 2008

    If the high voltage rectifier diode is not shorted, it's probably good.

    My solution above shows you how to test components if you or a friend has a multimeter, VOM, or other test / continuity meter.

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


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