Possibly just rust piled up in the chimney tube. Moving the rv could have flaked it off and then it stacks up and the heat does not get distributed. Of course you are getting new stuff so no worries. The chimney has a S shaped piece of metal suspended by a long rod from the top. They can be difficult to get to and my only be able to feel for it. Lifting it out you can shoot air to clear it. I used a shotgun cleaning rod once and that worked great. That same rust can pile up on the burner itself and cause the same issue. There should be cleaning instructions if you download a manual for it.
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Certified Senior Electronic Technician, Telecommunications Engineer, Telecommunications repair Service Center Owner, Original owner HR 2008
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