If it is working on shore power, then it is likely that the problem is in the burner/flue area and possibly the gas line.
1. Remove the cover. Look at the flame. Is it burning mostly blue? Can you hear it? Is the flame going up the flue or back toward the line? If it is not going up the flue, turn it off immediately. You likely have a mud-dauber or other insect nest or carbon or other blockage in the flue. To fix this there are several things to do. a. Shut the propane tank valve. b. Let the burner cool. Then remove it carefully, being sure not to lose the little piece of metal with the orifice. Clean the burner with rubbing/denatured alcohol. Clean the orifice also. You can use a soft brush, but don't poke through the hole. You can damage it. c. Remove the slanted T top to the flue. Under that, there is a wire. Pull that out and you will see a spiral shaped piece of metal. Clean that. Clean the flue also. If you can get a brush like a shotgun cleaning brush in there, scrub the carbon out of the flue. Replace the spiral and the top in the same orientation they were when you removed them. d. Reassemble the orifice and burner and reinstall them in the same positions they were before you removed them. e. Remove the propane hose connection near the refrigerator. Remove the hose from the regulator. Place the regulator end in a container. Blow air from the refrigerator end through the hose. I suspect you will have a significant quantity of greasy liquid that will be in the container. Once you have done that, reattach the hose at both ends. f. Turn on the tank valve and use soapy water to test for leaks. If you see bubbles, tighten the connections and check again. Repeat until no bubbles appear at any of the gas connections you removed or any others you wish to test. g. Light the stove to purge the air from the gas lines. Once you have a steady flame, turn the refrigerator on and switch to propane. It may take several cycles before it will light and maintain a flame. h. View the flame. Is it burning cleanly? Do you hear the gas and flame? Does it sound stronger than before? If so, then you should begin to notice the refrigerator cooling.
One other thing. When you say you set it to the highest level, how many LEDs are illuminated? More lights = more cold. Also, if you have a high ambient temperature, the refrigerator will struggle. Make sure the side of the trailer with the refrigerator is shaded if you can. You can rig up a reflective shade to not let the sun shine directly on the back of the refrigerator compartment. Just don't block the vents. You may also remove the freezer compartment separator and door so that both cooling plates/fins can work to cool the refrigerator. I've had to do that when the ambient temperatures were very high which is likely at Yuma.
Anyway, please let us know if this helps. If you do not feel comfortable doing this, then you will likely need to take it in for service.
------------- StephenH
Happy is the man that findeth wisdom,...
http://www.rpod-owners.com/forum_posts.asp?TID=7712 - ouR escaPOD mods
Former RPod 179
Current Cherokee Grey Wolf 24 JS
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