Mine is doing the same thing right now. Dometic garbage. We have had trouble with this unit since day one. Dometic is practically useless for customer service and the parts are incredibly expensive. The first week we had this thing the plastic freezer box brackets literally crumbled in our hands. The plastic is as brittle as chalk. The replacement parts were just as bad so I had to make my own. Same goes for the black plastic frame on the door front. The freezer door hinges, junk. The condensate cup turned to dust within a year. I could go on and on.
Our fridge has let us down on many many occasions. It can go for a week on LP and work fine then one day I'll open the fridge and it'll be 50 degrees. Sometimes the freezer quits and sometimes it doesn't. We always have to carry a cooler because the fridge is so unreliable. Works great on shore power. On gas it's a roll of the dice. We have invested over $300 trying to remedy the problem, not including the price of a cooler and multiple blocks of dry ice. The last time Dometic was contacted they wanted to sell me a part for $311. Add that to the $300 already wasted and I could have had a brand new unit.
We have good a good blue flame. Burner is clean. Cooling fan at the back of the unit is working fine. LP regulator has been replaced and the gas flow is exactly where it's supposed to be. Freezer is near zero and the fridge is at 80 degrees last time I checked.
If anyone has a solution PLEASE post it. Dometic can go pound sand.
Mike