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F8 means that the oven door latch has failed which is why the unit won't self clean. Try to wiggle the latch and unplug the oven or flip the breaker off to the oven for 60 seconds to see if the latch will reset. If that doesn't work then you need to replace the door latch before you can use the oven again. If it DOES work then don't try to self clean again or it could fail permanently. You'll need to replace the latch before you can use self clean again.
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