Please help me understand what went wrong and how I can fix it?

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[–] 6 points 1 year ago

Big yellow flame probably indicates its not getting enough air mixing with the fuel for complete combustion. I'm guessing something got clogged up with soot, or possibly rust. Look around at all the little holes the gas comes out of, see if any of them are clogged up. If you find some, something like a safety pin can probably get them opened up.

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