I found some good info on the internet http://everything-about-rving.com/bl...er-heater.html about cleaning out the burner tube and chamber. As it turns out mine is an Atwood so it doesn't need an Anode rod. I still haven't found anything on adjusting the air fuel mixture. Anyone know where I can find that?
There may be critters have taken up residence in the burner tube, which is a common problem, good cleaning might help.
There should be a air dampener on the burner tube that you may be able to adjust to get a nice blue flame.
Danny & Linda
Sold our '13 Thor Redwood 36 FB
Currently RV & truckless
Thanks for the suggestions. I am out camping right now. When I get home I will give the thing a good cleaning and see what happens. I have a warranty that covers heaters and things so I will most likely use it to get a new one. Besides smoking mine is pretty rusty.
I had about the same issue with a class c years ago i had brown/black burning smoke marks above the hot water exhaust on the outside, turned out to be the high temp switch was at fault it would not shut off propane to the burner, the switch was easy to replace hope this might help.