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Dometic CDMW12B RV microwave- runs like its working but doesn't cook. Lights up, table rotates and all the buttons work. Fixable or dead? Thanks, Anne in Michigan

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Microwave Ovens are inherently 'unserviceable' in that the radiation from a klystron tube is dangerous unless strict safety protocols are followed by a knowledgeable repair center. It is ionizing radiation. (Cell destroying.)
Unless you paid well over $100.00 US for it, better just junk it as repair costs are probably going to just about be that.
On the up side, failing microwave ovens under extended warranty are usually replaced same week. Check to see if you have one. If you paid with a Credit Card, sometimes the manufacturers warranty period is doubled automatically. Visa used to do that. Not sure if they still do. Ask.

https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&cad=rja&uact=8&ved=0CEUQFjAIahUKEwig6LzgoOPGAhVBOT4KHRsdABw&url=http%3A%2F%2Fwww.electronicstheory.com%2Fhtml%2Fklytheo3.htm&ei=QIepVaDIO8Hy-AGbuoDgAQ&usg=AFQjCNHJ8sg09og_raaF_T3lEUhWw80EmQ&bvm=bv.98197061,d.cWw

Posted on Jul 17, 2015

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6 Suggested Answers

6ya6ya

6ya staff

  • 2 Answers

SOURCE:

Hi there,
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Posted on Jan 02, 2017

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MicrowaveSvc

William Miller

  • 9179 Answers

SOURCE: GE Above the Cooktop Oven Microwave JVM1533 Turn table does not move

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

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

In this case, I would suspect the primary interlock door switch.

If you or a friend decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

There should also be a a very helpful "mini-manual" hidden inside the unit behind the control panel. It's very helpful when troubleshooting.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on Jan 12, 2008

MicrowaveSvc

William Miller

  • 9179 Answers

SOURCE: JVM1740SM1SS

Your membrane keypad has probably failed.

If you might want to replace it yourself, I have uploaded a handy guide with pictures showing you what's typically involved.

It's at http://www.microwavedisplay.com/keypad_replacement.pdf

We have critical safety, disassembly, and troubleshooting info at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

Essentially you unplug the oven from the wall outlet, and remove the control panel assembly as per the instructions at the site linked above.

(Remove the grille from across the top, remove the top screw in the control panel frame, then lift up & out).

There should also be a very helpful "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille.

Then unplug the keypad from the circuit board, heat up the keypad from the front with a hair dryer, then peel the old keypad off.

You have to make sure all the old adhesive is off or the new keypad will not stick.

I use paint thinner or mineral spirits, then follow up with isopropyl alcohol to be sure the panel face is squeaky clean and dry.

Then peel the backing paper from the new keypad and carefully press the new keypad in place.

You need to be precise - you cannot apply it, peel it off, then reapply it.

If you would like to have us do this for you, we do that for $39.95 plus part costs.

Please feel free to contact me directly if you need more help.

We're happy to help and we appreciate your thoughtful rating of our answer.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Posted on Jun 23, 2008

Anonymous

  • 140 Answers

SOURCE: Ge microwave model JVM1190WY buttons work but does not cook

The problem you are having with your microwave is a common one. Not heating is a problem that can be caused by three things. I'll list the most common solution first, the magnetron that actually does the heating is what is making that noise and has gone bad. It is possible for you to also have a bad high voltage diode that has opened up, solution two, or solution three is the high voltage capacitor is not working properly as well. From my experience with microwaves I am positive that it is your magnetron that is bad. If you are not do it yourselfer you'll need to take it to a repair shop to replace. However, if you know how to use a screwdriver and can unplug a couple of wires with spade terminals on them, then you can take it off yourself, find another one and replace it the same way you took it off. The magnetron sits behind the control panel of your microwave but on top. It has cooling fins on it and has 2 terminals maybe three depending and make and model that plug into it. It has 4 screws that are easy to get to that actually holds it in place. If you do not have a good local source like an electronic parts supply place then you can find the right magnetron at www.mwoparts.com. Be sure you always unplug the microwave before touching or trying to take the he cover off and then when you take the magnetron off also.Good luck and God bless.

Posted on Feb 11, 2009

bestdarngood

Benjamin Patri

  • 3037 Answers

SOURCE: My Panasonic Microwave Genius 1300W will not heat

Sounds like the magnetron has failed. This is the component that produces the microwaves that heats the food.

The cost of the magnetron is about 95% of the cost of a microwave oven. Most people don't, for this reason, replace the magnetron, they replace the whole oven which is probably what you will end up doing.

There is a possibility that the circuit that provides power to the magnetron is faulty and you need to take it apart, find the proper electrical leads and test them with a volt meter. To do this you have to remove it from its mounting and take it apart. It is a fairly lengthy process however.


Benjamin

Posted on May 26, 2009

drallim

  • 4088 Answers

SOURCE: Tappan TMV151FS over range microwave starts to work and then dies

Never run the microwave without a load (something to heat)!!! That kills the microwave generating parts.

Sounds like a 'thermal' protect switch is activating after running. Make sure that (if the unit is mounted in a cabinet) that there is sufficient space around the unit for proper air flow and that nothing is blocking the vents. Try setting it on a counter top and heat something. If it works properly and doesn't shut off, the venting space is the problem. You may have to have the cabinet that it sits in redesigned for more clearance.

Posted on Aug 19, 2009

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