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It is probably normal operation. There is a flash tube for lighting all the burners after the ignitor lights the first one. A small amount of flame out of that tube during furnace operation is normal. If excessive flame escapes from the burner tubes, a device called a "roll out sensor" will shut the furnace down.


I have a large Nat gas furnace in my garrage that occasionaly makes a noise it is from the flex gas line I found wraping it with insulation quited it down but if I listen hard I can still hear it, a contractor buddy said I could upsize the flex and it would go away but I decided that if it wasent hurting anything the insulation around the flex held on with ...

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