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Re: Fan runs when door is closed, but no heat.
It's probably a bad door switch or switch mount.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info (as well as a text file which helps in diagnosing and repairing door switch problems) at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
Feel free to contact me directly if you have further questions.
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SOMETIMES A DOOR SWITCH GOES BAD AND BACK FEEDS POWER THAT RUNS THE FAN AND IF IT HAS IT SOMETIMES THE TURNTABLE TOO SO YOU HEAR THE FAN RUN ALL THE TIME BUT TYPICALLY IT IS NOT HEATING. YOU COULD PUT A SMALL CUP OF WATER INSIDE TO SEE IF IT IS HEATING, PROBABLY BAD DOOR SWITCHES OR BAD CONTROLLER.
Key clue is table does not move---All microwaves with a table have a lever switch that is engaged when door closes--only can get at from inside the unit----it prevents the unit from operation if door not closed.
What happens from closing door a lot is the switch with a lever arm can come loose or even if snapped into a plastic holder break out of the holder.
If the oven is doing everything else properly (light comes on, fan runs, turntable goes around) but there's no heat, you may have a failed magnetron tube (the microwave source). There's also a relay that controls power to the tube that may not be working correctly, or the control circuit board is bad. It's also possible one of the door switches is not working (so the oven thinks the door isn't closed), although this usually keeps the turntable and fan from running.
Microwave oven service is not for do-it-yourselfers. There are potentially deadly voltages present even with power off, and a chance of microwave leakage if repairs aren't done properly. Let a professional give an estimate to repair it, or just replace it if it's under $100. (When I was servicing these things it wasn't unusual for a repair to cost over half the price of a new one. That's one of the reasons so few shops still work on small appliances.)