Hello Derrick Baker - Typically no fan should come on without starting the microwave. There is one exception! For an example, if the microwave becomes too hot from something that is cooking on the stove below the microwave, the fan will come on and will cycle off once the bottom of the microwaves cools back down. If the fan is turning on when the door is closed, more than likely, a door switch as failed. At this point, I recommend connecting with a certified technician to move forward accurately to assist with the repairs.
Quite often this is due to a bad door switch. Opening the door while cooking (without first hitting the STOP pad) is the primary cause of door switch failure.
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
We also have the complete service manual for this model at our site.
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during cooking the fan comes on spontaneously and then won't turn off when trying t turn off. Have to unplug it. After being plugged in again after awhile it works normally for a few days then does it again. Help!
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