Check the flame adjustment...it may be burning too rich (hot). Haven't worked on one of these for years but the furnace in the old truck camper had a flame adjustment and a movable sleeve that would adjust the gas/oxygen mixture. Road bumps may have caused them to get out of wack a bit.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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