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Yes, there is certainly a danger if the fan isn't running. The fan is the cooling fan to keep cool air running around the bottom, back, and top of the oven so the cabinets in your house where the oven is built into doesn't get to hot and possibly catch on fire. The fan also cools the electronics down so if the fan isn't running most likely the electronics will overheat and short out first---but if that doesn't happen your cabinets could get too hot especially in a self clean cycle or something that gets the oven really hot.
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