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I have a 2017 FB3820. A couple of weeks ago while draining the HWH, my furnance did the same exact thing. Seems the water ran over the cover and made its way inside and flooded the electronic fan board. The position of the board is terrible, it lays flat in a little box that doesn't drain to well. I pulled out the board and dried everything with a hair dryer. Then I filled the seam around the furnance with clear silicone, once fully cured I ran a razor through the middle of the silicone so I could still remove the cover pretty easily. Seamed to work, I haven't had the problem reoccur yet.
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