OP is probably going by the cabin size, which is what many conventional RV manufacturers use to describe their models. Depending on who I’m talking to, I sometimes describe my Scamp
as a 10’er.
Measuring travel trailers by total length, including tongue and bumper, is the older convention, still used by molded fiberglass manufacturers, so on this site I call mine a 13’ Scamp
There are two Parkliners, a 15’ and a 16’. Both have the same size cabin.
Back to the fridge… besides checking settings, verify the flame remains lit and the flame tube and upper exhaust vent is unobstructed. Seems like it was tested overnight. That should be enough time to cool down.