When you say the fridge is warm when opened, how warm? is it like the fridge isn't cooling at all or just not enough? Is it empty or full?
How hot is the ambient temp where you are camping? Hot days have significant effect on RV fridge performance.
My fridge is a two-way, but when I run gas to cool it at home it takes 24 hrs to cold. If your fridge is cooling some, just not cool enough, and full get the contents out and in a cooler. Give the fridge a chance to catch up then try to only add pre-chilled items.
Best of luck.
2007 Chevy Duramax LMM/Allison
2012 Jay Flight 29QBH
2012 Jay Flight 26BH (Sold)