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I take it you don't have the manual for this? I can get you one when
get home for lunch.....I can't do it on this tablet. But you go to the mode button and advance thru the choices until you get to "Fan" and then choose "Auto" and the fan will come on or off depending on what temps you set for that. It will cycle on and off with the room temp. Hope that helps here. Once I have the manual I will attach a link to that for you. Get back to me if you need more as all follow ups are included in our fee.
Go to the link below for the copy of the instructions for this thermostat............. http://www.dometic.com/QBankFiles3/EPiServer/Dometic/US/Manuals/RV-manuals/Air-Conditioning/Comfort-Control-Center-ii-operation-manual_17586.pdf
Were you able to get this resolved? Please let me know if you need more assistance here.