How long have you had this trailer and has it always worked to the performance you desire.
How long has it been since the last time you used the fridge working properly and now that the fridge isnt working properly.
Is setting 4 all the way up? If not turn it all the way up and work your way down. Make sure your vents behind the fridge are clear. Fridge won't work properly if you don't get the heat out on the back side of the fridge.
Have you run the fridge on propane
I park my trailer outside all year long in the So Cal weather. My fridge has yearly spider issues. itsy bitsy spiders seem to like to crawl inside the burner of my fridge and make a silk like nest there. The burner will light
but not heat up properly. Then I know that I have to disassemble the burner down to the gas orifice to effect the proper cleaning. This is not easy to do given the space for which I have to work.
My 3 way fridge doesn't have any electronics to go bad so it always is either you don't have enough heat from the propane
or you are unable to get the heat out of the fridge compartment so the fridge can work properly.
If this trailer is new to you and never worked properly since you got it then there could be a dozen things that could be amiss.