DB, I had the same issue and thought it was not working properly. My RV shop told me it is because the trailer was not level. I bought one of these little bubble things that has a circle in it. If the inner bubble is in the circle, the trailer is level enough and I my fridge gets cold.
Hope this helps.
2011 Jayco Flight G2 23FB
2008 Dodge Ram 2500 HD
1500Weight Distribution System, Accupower Pilot Brake Control, Sway Control, Husky Elec Jack