We had a guest for a repair at our Repair Cafe last week, and he did have a Sharp Microwave, that had the same problem. Maybe looking into the manual will help, see url Sharp 319F Operation Manual
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.
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