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F9 means that your oven latch has failed. Try to open the door, wiggle the latch hook. Then flip the breaker off to the oven for 5 minutes. Flip the breaker back on and if you still get an F9 error, your door latch has just failed and the oven can't be used until you replace the door latch I'm sorry to say.
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Then unfortunately there is nothing you can do but replace the latch as I mentioned before.