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the unit inside the microwave that heats called the "magnetron" has gone bad or the circuits that power the magnetron and turntable have failed. if its under warranty still, send it back to the manufacturer. if not you can call some repair shops and see how much it would be to service it, but its most likely going to be cheaper to purchace a new microwave since they are relatively cheap these days, and electronics repair people are not cheap. hope this helps
I suspect the door lock interface switch(es) are burned out. Unplug it, be mindful of the 25,000 volts in the silver thing. Check the micro switches (look where the door closes on the top right side, probably) two positions, normally open or normally closed. check them for proper operation.
Micro switches are the most common of microwave failures because most of us open the door while the machine is running causing arc at the switch and burning up the little contacts.
You have not given much information, but it appears the Magnetron element (the heating device) in your oven has failed. Repairs are not cost effective my friend. New units are low priced and have many new features. Consider this.
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)
If you or someone you know 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 "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.
We're happy to help and we appreciate your thoughtful rating of our answer.
One of the things that well cause that to happen is the voltage Reg. sticking close. thats only one thing there are 7 others that well do that you need to find a electronic Tech who can look at it for you.