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Hi, welcome to Just Answer. My name is ***** ***** I look forward to helping you! If the co0nvection fan is running all the time, the relay that controls it is likely faulty. However, if the cooling fan is what is running, you may have another issue. Is it the convection fan in the oven that is running?
The convection fan is the one inside the oven. It should not run during a regular bake. Does it?
The fan on the top is the cooling fan and should turn on when you turn any bake program on, regardless of using convection or not. That fan cools the electronics and the cabinet area between the oven and wooden cabinet.
If it is really loud, the bearings are probably out and the fan will need to be replaced.
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