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F8 means that one of your oven door latch switches has shorted. The cooling fan is running because the oven isn't sure if the door is latched or not. The latch motor and switch assembly is actually on the BACK of the oven so you'll need to pull the oven forward and remove the entire back sheet metal panel. The motor will be toward the top of the oven cavity on the back of the oven itself and you'll need to order and replace this part to resolve the issue if flipping the circuit breaker off or unplug the oven for 5 minutes doesn't reset the electronics. Below is a link to the door latch assembly you'd need to order and replace for your model.
CLICK HERE for door latch assembly
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