I seem to remember this unit has a 'thermistor' mounted on the aluminum fins at back of fridge section? If so, you can move the gadget up or down to change what it senses, but can't remember which is colder, up or down. Whatever, move it to the other end of the fin it is on and see if that helps.
2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired