The fan is in the converter that changes 120 VAC to 12 VDC to charge the battery and operate the 12VDC equipment (fridge & furnace "brains," hot water heater, 12 VDC lights and vent fans, AC & furnace thermostat, electric jack if you have one, slide out if you have one, etc.) Usually the fan runs when you put more than a minimal load on the system. It will also run if the battery is low on charge and the converter is recharging it.
Assuming you're not running a bunch of lights, I'd guess the dealer recently installed your battery and it is not fully charged. Once it's charged, the converter fan will probably shut off.
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1988 Coleman Sequoia - popup (1987-2009) - outlasted 3 Dodge Grand Caravans!
2012 Roo19 - hybrid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado 1500 Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10
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