Woodie, since your fridge is a 3 mode type, when used only on DC, it will draw a fair amount of amps from your converter and battery. That would be the reason the converter fan is always on. When you put in on gas only, the fan probably shuts off? Look a page 9 of the manual and it explains that in only DC mode it will discharge your battery rapidly if not connected to towing vehicle or shore power. The DC mode is to be used once the fridge is already cooled down and to maintain it that way when you travel. As far I'm concerned it is normal operation.
2011 Rockwood 8319SS with ProPride 3P hitch/GoodYear Marathons/TST TPMS 507
2008 F250 Lariat CC SB 6.8L V10 4.10 axle ratio (NITTO TERRA GRAPLER G2 LT275/65R20E)
Yamaha 3000iseb generator:Progressive Ind. EMS-HW30C : Eastern Ontario
Nights Camped: 2011(21) 2012(36) 2013 (17) 2014 (18) 2015 (18) 2016 (36)