I'm leaning towards that the cooling unit is fine. If not it would not work on electric. I would find a water column pressure gauge and test pressure. Minimum is 10.5 inches of water which is 0.37 PSI. The flame may look OK but if it's not enough BTU or propane feeding it you won't have enough heat for the cooling cycle. I would also clean out the burner assembly the flue. A pair of 12VDC pancake fans at the roof vent will help improve performance on either heat source.
My 6 cu/ft gave up two years ago but I still have the owners and service manual which will help. I had an obstruction in the piping between the freezer and fridge.
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2006 Hurricane 31D built on a 2006 Ford F53
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