If you have 120 shore power, make sure your climate control switch is on.
In my model it is located in the fridge door frame.
It is 12 volt DC so make sure it is off if you are running on battery.
There is no difference in operation between AC and DC/Propane because they are only a source of heat to boil the ammonia in the coils. The "cooling" comes from the condensing of the ammonia gas back into liquid which is a fixed quantity based on the chemistry of ammonia.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW