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Interesting problem. I don't have a Firefly system just to be clear. So AC power sources feeding the converter/coach batteries seem to cause your issue.
Does any other Firefly controlled fan or load being turned on have the same problem, when you are on shore/gen power?
I think the Firefly system uses a capacitive touch sensitive screen, so perhaps the AC sources are causing or inducing some electrical “noise” on the line that the Firefly controller sees as off signals when you are turning the fan on? This is almost behaving like a mechanical switch with contact bounce in digital circuits. You might try contacting Firefly tech support with your system model info and see if they have heard of this before. Could be simply a bad ground somewhere that is allowing electrical noise to interfere with this fan control. Failing that a flakey Firefly control pad maybe? Good one....2 points for a head scratcher.
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