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Hi again. I am not sure I follow your software comment related to the 3 amp load capability; but if it was a software issue I would expect many other customers (with that software) would have the same problem.
It is possible that Firefly uses a transistor (not a relay) to control the problem fan (but I would lean to a relay since it is a motorized device)…….but it would still either require hard wire between controller panel and the fan, or a wireless approach for control. If wireless then there must be a small receiver module located near the fan or close by (with some kind of repair access) that actually turns the 12vdc on/off to the fan motor itself. If you can find the fan module you could try to obtain a replacement and see if that cures the issue (this assumes the module is flakey or sensitive to any AC noise coming through (or induced) on the 12vdc lines). Since this fan is the only problem load it would seem more likely that the receiver module at the fan is the problem (again assuming a wireless control). Maybe other owners will chime in who have had this issue and will suggest their final solution.
You could try your own relay control with a manual switch hard wire solution, but that defeats the Firefly controller you paid $$ for. I agree with you that this is not normal operation. The final fallback since I assume you are still under warrantee is the Dealer…….but at this time of year it is hard to get in and they have your coach for as long as it takes. You could ask Firefly to confirm if this is a wireless control of the fan install and ask them for a replacement receiver module if it is.
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