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Sharp, noisy blue flame=too much air

Blue flame with defined inner lighter blue cone= just right

Soft blue flame with yellow tips=not enough air, or using LP gas

Most times can be adjusted with the primary air shutter on the burner tube, being careful to check for good ignition after adjustment.

Caution: a yellow flame can carbon/clog up the heat exchanger eventually.

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Q: What does a blue flame mean on a gas furnace?
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