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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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How to make sure you Heat is working


A common problem with a furnance is the furnance will attempt to ignite, several times, you will notice that the house is not heating properly. You will hear the furnance come on and you will assume the heat is on, and the house will continue to be cool. You wiil check the furnance and you will hear it start up and the blower will come on, however a few seconds later after you have walked away the blower will shut down and there is no heat on at this time. You will again go check the furnance and after the furnance start and go through the cycle the furnance will shut down you will notice that the furnance has indeed shut down. This is the common problem of the flame sensor, you will have to remove the flame sensor, get a small piece of fine grade sand paper, and remove all the black colored carbon from the flame sensor until is is shinning bright, replace the flame sensor and attempt to start the furnance. You will notice that apatment or house have reach the set temperture, that the furnance has went through its cycle and the furnance will ignite and stay on continueously until the house obtain the preset temperture..

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