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

    Dec 15, 2012, 05:31 AM
    Why I cant get my furnace to work with the thermostat
    I have an old luxaire furnace with just heat and it has three wires coming out I can't get it to work with a thermostat but I can connect two of the wires together directly and it will work not sure what the third wire is for they are red white and black
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Dec 15, 2012, 02:15 PM
    With heat only and no ac, all you need is 2 wires connected to tstat,1 to r post, 1 to w post
    mygirlsdad77's Avatar
    mygirlsdad77 Posts: 5,713, Reputation: 339
    Plumbing Expert
    		  
    #3

    Dec 15, 2012, 04:52 PM
    Is it a new thermostat, or an old one that just isn't working anymore?
    Oh, and wmproop is correct, you will only need the red and white wires.
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