So we are in Jasper, B.C., and the fridge stops working. 1999 Casita. It works fine on A/C but on gas the temperature goes warm. We have a digital thermometer in the fridge/freezer so we can monitor the temperatures. On electric, it is 38/7 degF, on gas, 60/40.
The Dometic manual offers only one option for self-service - clean the orifice. I remove the flame cover and then remove the pilot/sparker housing. The orfice cap has a weird socket size - metric or something in the 64ths rage. But it does come off. Looking at it, it appears to have a piece of red plastic across the cover, with a tiny, tiny hole in it.
The manual says to soak it in wood alcohol, but all we have is Vodka. An hour in the vodka, I gently blow it clean and it seems to be larger in diameter. Rather than waste it, I drink the vodka.
I re-install the orifice and an hour later, the fridge is running at 38/0 degF on setting 2 (where we tend to leave it).
I ended up re-doing this again with real wood alcohol, and the fridge is running like a champ, after 17 years.
Once again, though, I will have to repaint the door frame with Rustoleum Khaki spay paint, as it continues to rust (it is galvanized steel, but 17 years is a long time).
If your fridge works on electric, but not on gas, check your orifice.