Im convinced that running the fridge on LP while traveling causes an in-efficient burn and soots up everything and leads to the rust. I think it is closing the shell and the fan running that changes the fuel to air mixture that leads to the in-efficiency and more soot and acids in the burn.
Our first TM, we traveled on LP and twice I had the issue within 18 months or each other. I switch to 12v and rewired so the fridge ran on the auto battery when traveling and only ran LP for camping without electric. I did not have a dirty burner after that.
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Art & Joyce
Current camper: Motor Home
Previous: 2009, 3023-QB and 2003 2720
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