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    auroralynn898's Avatar
    auroralynn898 Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Oct 12, 2009, 04:13 PM
    Rth221b1 - 2 red, 1 white, 1 black
    I want to install this honwywell rth221b1 thermostat but I have two red wires on the bottom of my old one and a white on the right and a black on the left (of the old one). On the new one it has Y and G on the left and Rh, Rc and W on the right. Where should I attach the wires or did I just get the wrong item? Please help, thanks!
    hvacservicetech_07's Avatar
    hvacservicetech_07 Posts: 1,083, Reputation: 75
    Ultra Member
    		  
    #2

    Oct 12, 2009, 05:25 PM

    Was the old thermostat labeled, if so what wires went where on the old thermostat?
    letmetellu's Avatar
    letmetellu Posts: 3,151, Reputation: 317
    Ultra Member
    		  
    #3

    Oct 12, 2009, 07:33 PM

    You will have to find out which wire does what to the furnace circuit board.

    If you have a Ohm meter I can tell you how to test the wires to find out where they go. So get back to me and we will work it out.
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