Spiders and other bugs love to get in these burner flues and cause stuff like this.
They make a special brush to clean out the flues, and you can sometimes just blow air thru them (if you have something available) to clean it up.
FYI: It appears you have an Atwood/Dometic brand water heater from your youtube video.
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 2011 Flagstaff 831 RLBSS
If people could burn calories from jumping to conclusions, obesity wouldn't be a problem.
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