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Igniter kicks the burners on, but about the time the main fan turns on, the burners blow back out. blowing cold air out as a result. plz help!!!

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From what you are saying, I would bet you have acrack in the heat exchanger.See if you can watch the burner when the fan comes on. You should see the flame blow out and either move away from the flame sensor or onto a a rollout switch. I'm afraid the only remedy is to replace the heat exchanger or the furnace, depending on the age of the furnace.

Posted on Nov 17, 2009

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