Maybe this answer will be useful even now. I took the documentation for a similar model HES255U and in the Troubleshooting section there is the following on this problem https://www.ovenmanuals.com/bosch/hes255u/use-and-care-manual/
If a 'F' code flashes, press Off to clear the display and stop beeping. Reset oven if necessary. If fault code remains and beep continues, record fault code, cancel oven and call authorized servicer.
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