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I hav a armstrong direct air furnance and when i call for heat the burners stay on for about 10 secs then go out and after the 3rd try it shuts itself off

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Sounds like the flame sensor is dirty. Carbon builds up on the surface and it just takes a very small amount to block the sensor. Take some steel wool and very gently clean the surface off. The sensor is located at the last burner in line. Looks like a thick piece of wire just sticking down. Let me know how it goes. ken

Posted on Jan 15, 2009

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