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Won't heat an is louder then it used to be

Microwave every thing works but does not heat an the sound that all microwaves make is the same, only much louder

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  • 8,820 Answers

Assuming your inside light and turntable come on when you try to microwave, with the symptoms you have, I would most strongly suspect a shorted high voltage rectifier diode or a bad magnetron, or a loose and possibly corroded connection on the magnetron's terminal.

The diode is a fairly cheap fix, and the mag will cost more.

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.

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.

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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

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

If you need further help, please reply back with your model number.

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

Posted on Mar 02, 2009

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I have the danby designer Mod DMW162W-ORT that won`t heat at all but everything else works. Hums a bit louder but will not warm.


The Magnetron in your unit is no longer resonating properly. The Magnetron produces the microwave frequencies and when it resonates properly, it will provide the excitation to heat your item(s). As well, the diode that accompanies the magnetron needs to be replaced as well. Should it be under warranty, take it back. Out of warranty? Have an appliance tech repair it (usually around $175) or get a new microwave.

This is typical for most microwaves. No such thing as quality any more.

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Microwave does not heat


To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, your symptoms, as well as the answers to these questions:

- When you try to microwave are the inside light, internal cooling fan and turntable all working?

- Is there any unusual noise or is it louder or quieter than normal?

We have a sound clip here of what a microwave should sound like when the cooling fan and high voltage section are working.

A loud buzz, hum, or groan is usually a shorted high voltage rectifier diode, but a sound like gurgling into an empty coffee mug is one symptom of a failed magnetron, and yet the mag can be bad without that sound.

These answers will help me figure out if it's a control-level issue or a problem in the high voltage section.

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Hi, this is common in most microwaves. this abnormal noise is coming from a faulty Magnetron. this device is responsible for the heating process and, it is damaged and not heating at all at this point.Simply replace the Magnetron and, this unit will start to heat once more.

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Sounds like a component failure in the microwave circuit.

It will be one or more of the following -

Fuse
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Reply back and I can help you more. These failures happens to new or old microwaves.

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Kenmore Galaxy Microwave Hood Combo Model 72180002400


Since it sounds louder than before, it is probably a bad high voltage diode or magnetron.

If it's within the magnetron portion of the warranty (usually 5-9 years) but out of the original full warranty (usually 1 year), then your manufacturer will cover the part cost, but not the cost to visit you or the labor charge to do the work.

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

Sears may send you a magnetron to install yourself since it's under warranty. For that or warranty service, contact Sears at http://www.sears.com.

You can save about $75 by taking it to the shop yourself, as opposed to an in-home service call.

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

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