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You didn't say what model microwave you have, but most that I have seen have two separate circuits inside. One operates the magnetron (which makes the microwaves) and the other operates the other things like the turntable or the inside light etc.. It is quite possible that you have a problem in that second circuit. This allows the heating without the turning. To fix this type of problem, if indeed that is the case, requires some skillful trouble shooting inside the microwave which I don't recommend your try unless you are a skilled technician, because of dangerous voltages. Go ahead and post the brand and model number and I can be more specific as to what action to take.
If the oven is STILL heating, but the carousel isn't turning, this problem is commonly attributed to a turntable motor that has worn out and may need to be replaced. The motor is attached to the center plastic piece (called a turntable shaft, turntable ring or coupler) under the middle of the glass tray. The following link explains how to access and replace the motor:
This is a very simple repair, that usually is not expensive. The price will be determined by the model and manufacturer. This repair can also be performed on an over the range model microwave oven WITHOUT uninstalling it.
You can refer to any of the following websites for comparison:
The first three sites listed have helpful exploded view diagrams to assist you with locating and properly identifying the part(s) you may need.
The average price for a motor is about $25 to $45. If your model number is not listed at all the sites, use the part numbers from the Sears site and use them for your search criteria. The model numbers don't always cross reference, but the part numbers do. The part number for a replacement turn table motor for the model you have listed is WB26X10038 (listed as item 43). If your model number does not cross reference to all websites, use the part number from the Sears website as your search criteria. NOTE: Even though the carousel may not be turning, you can still use the microwave while awaiting parts. You will need to physically rotate whatever you are heating about midway through the cook time to ensure even heating. Early model microwave ovens were not equipped with a rotating carousel and this was the common procedure.
Remove the turntable plate from the oven. Put a cup of water inside the oven, away from the turntable drive gear. Turn the oven on and look through the door to see if the drive gear is turning. If not, then the motor is probably defective and needs to be replaced.
It will need a new turntable motor.
If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk
You can find helpful exploded view diagrams and order parts by entering your base model number (without the suffix) here: http://tinyurl.com/gv383