Hello,
F3 is the error code for control panel failure. A replacement costs~$200. In reading the literature, some people have had temporary success by depowering the unit, removing the ribbon cable to the control board, and cleaning the connections with a pencil eraser. This has bought some people several months of time, some none.... Once ordered, the part usually arrives in several days, and swapping it out isn't hard, once you get to the card.
Hope this helps, --W/D-- please feel free to rate this solution.
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