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Question about Amana HDC21 Microwave Oven

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Not heating while using heard a noise, replaced main circut board, didnot fix. noticed a part called SNUBBER is broke, it has three wires connected to it,with no circutery,any way i can jump those wires and what with what? wires are black, grey and brown help kesh

Posted by keshr on

  • Anonymous Feb 15, 2008

    I have a RO-24 8 amana radar range insert that will not heat. It starts and can here the fan run. Checked for ground and the capacitor both seem to be ok.



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William Miller

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You can find helpful exploded view diagrams and order parts by entering your model number here: When a microwave is not heating and is making extra noise, it's usually a bad magnetron or high voltage transformer. But once you've looked over the documentation I pointed you to, let us know if you still have trouble.

Posted on Sep 23, 2007


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Related Questions:


My question does this model have in the ceiling mould these three small circle indents or are they defects?

The indents are probably there to make the ceiling stiffer, and are not likely defects. Sharp, historically at least, has had a tendency to use thinner metal parts than other manufacturers, but it hasn't seemed to reduce reliability significantly.

If you run the oven with food in it, a sizzling sound could be a sign of a problem, or it could be normal for this oven. Ask the dealer about the noise.

If you need further help, I’m available over the phone at


Mircowave does not seem to heat anything any more,does it need a fuse, or larger part replaced? model jvm 1440aa001. Thanks for your help

There are several reasons the oven can stop heating. The most common is failure of the magnetron tube, which generates the microwaves. If you've been noticing longer cooking times, unusual humming noises or an electrical odor, these are signs of a magnetron nearing the end of life. When they finally fail, it's one of two ways. They open electrically like a fuse blowing, so that everything seems like it's working but there's no heat, like you describe. Or they can short-circuit, which causes a very loud humming or groaning noise and no heating, and may cause the main power fuse to blow so that the oven goes completely dead.

Unfortunately, the magnetron is about the most expensive part in the oven. So while it could be replaced, it's usually not economical. Between the cost of parts and labor (this kind of repair is best left to professionals because of safety concerns), it may only be a little more money to buy a new oven. In some cases, repair may even cost more than a new one.

There are other possible causes. There may be bad connections that have developed or something has gone wrong on the control circuit board. Other parts in the power supply for the magnetron may have failed. If you want to keep this oven, see what the cost is for a professional to check it over and give a repair estimate. It may turn out to be worth fixing. But if the magnetron is bad, it's probably time for a new oven.

Sorry I can't be more positive, but thanks for using Fixya!

When I turned on the Microwave oven, I heard a different noise.

its probably the fuse connected to the magnatron which is a small white casing with two wires coming out of it..the fuse is inside this..costs about 5 -6 pounds n ebay

Does not heat

problem is the fuse to the magnatron has blown or the magnatron needs replacing remove the outer cover three or four crosshead screws you'll see a pc board with a white fuse on board try changing it read th fuse value on fuse base don't connect the mains plug with the cover off.

Panasonic Microwave NN-C980-B buzzing noise but it still works.

I have a 2003 Sears Ultra Wave microwave 721.63682300 with a similar problem. A few months ago it started giving off short buzzes when turned on. That stopped but then I noticed that everything took twice as long to heat up. After quite a bit of teardown&inspection I found a circuit break in the inverter board leading to ZD704 diode (pictured). I will now try to find a replacement diode to see if replacing will fix it. Thanks for your postings.


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Replace turntable motor. Not really that hard to replace or expensive. Remove all screws holding bottom panel (usually three across each side and one to three in front) to gain access to the turntable motor. The panel will hinge in the back.

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one of the internal door switches, the high voltage circuitry or the circut board may have a problem to resolve this you need a qualified appliance technician

Emerson Model MWG9111SL Microwave not always working

ok i just opened mine up on counter and found that the white wire on the high voltage transformer had been loose and melted so i put a new female spade connector on and it works fine. i suspect that from a year of use and humm from transformer had loosen it and gotten hot thus loosing connection and getting dirty causing it to overheat and burn off plastic sheilding. easy fix!!!

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Does the problem "fix itself" or your service guy replacing parts and fixing it?

Generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
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- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part such as high-voltage rectifier diode

Door switches are most often damaged by opening the door while it's cooking (instead of pressing Stop / Clear first) or food
/ grease debris in the switches.
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