Thumping noise when my furnace gas valve opens

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Jan 28, 2010, 09:00 PM

Thumping noise when my furnace gas valve opens

I have a colman down draft L.P furnace 7 years old. When the gas valve opens there is a loud thump. The sound like some one thumping on the side of a metal drum. The flame is blue to the defuser and then turns yellow at the tips.

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