LP fridge problem

Thermocouple. It's the copper probe close to the flame...

Also, the burner area may be full of debris; try cleaning with a vacuum or air blow. While you're at it, clean the "chimney". Often full of rust.

Not the photo I was looking for...this is the rear of the Astral that was in my Airflyte. 

You will likely have no choice but to remove the fridge from the camper to work on it, there just is not enough room to access the burner and the thermocouple from the interior of the cabinet.  The thermocouple is a copper probe that inserts directly into the flame of the burner, on one end.  It should be screwed into place.  The other end should be mounted in the valve itself.  The thermocouple tells the valve that there is heat, meaning a flame is present, so keep feeding the propane.  If the flame goes out the thermocouple will cool and close the valve, stopping the propane from going to the burner and leaking into the cabin.

The chimney, referred above, is simply the tube that reaches up through the compartment above the burner.  It is usually a small diameter and has a baffle in it.  It can become plugged easily with insects and their nests. It is not difficult to clean it out either, a little compressed air is plenty.  Be sure to check the surface of the burner itself after the chimney gets blown out that no 'chunkies" plug the burner holes.



 It will not be directly connected to the outdoors, the ambient air flow simply directs to the outside through the louvered vent.

Ten and Vikx, thanks for the help. I did try to access the fridge by removing the outside vent, but could not get to the area I wanted. Then I discovered the original manual in the camper, which had a trouble shooting section that described my problem. I simply had to bend a flat piece of metal closer to the flame. I presume this is what you all called the thermocouple, but the manual refers to a "klaxon valve." I was able to reach it from the front bottom access panel. All is well now in the Vacationaire.