refrig on lp... fumes in camper.

[epbigfoot]

First I would like to thank all that responded to axle "flip" . First things first I am having trouble with LP part of refrig. Cleaned out wasp nest in burner. fires good now, (manual refrig.) BUT have got the co2 or some kind of alarm and terrible fumes in camper. Took off roof vent and wasps big time nests. Cleaned off screen and reassembled and coated screws. Go back in, push red button, hit igniter a few times, presto green arrow goes to green, about 1/2 way or so. About 2 hours later have "fumes" smell in camper again. Not enough to set off alarm yet. Anybody have any ideas. Thank you in advance