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    mtlrth1's Avatar
    mtlrth1 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 19, 2009, 09:10 AM
    Blower runs continuously after heating cycle
    Hi, I have a 1980's 100,000 BTU Heil Gas Furnace (Spark Ignitor type). The problem that I am having is that the Blower fan runs continuously after the heating cycle. I know that it should run for awhile after the heating cycle to cool the Burner etc to prevent warping, but the Blower just keeps running continuously, even if I switch the "Fan" switch on my Thermostat to the "Off" position, it just keeps running. The model # of my Furnace is Heil NUGK100DH05. I assume that there is a Thermostatic Sensor that detects when the Burner Temperature is cool enough to safely shut off the fan, but I am not 100% sure if that is the problem, and if it is, where it is located or what it looks like. There is a small "Relay" looking part mounted on an "L" bracket on the inside, right above the Burner (silver can with 2 wires coming out of the top) Is this what controls that, or am I off base? Also, if that is the right part, what is it called & about how much do they usually cost? Thank you for any help you can give! :)
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 19, 2009, 09:37 AM
    On a older unit you probably have a fan and limit control that is stuck or out of range defective.
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