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    onesassygirl's Avatar
    onesassygirl Posts: 1, Reputation: 1
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    #1

    Oct 11, 2006, 08:37 AM
    Thermostat Wiring Problem
    My problem is this: My fiancé decided he would install our new thermostat. He takes the old one off the wall then says OK so what color of wire goes to what terminal? He however did not draw a diagram sooo this leads me to my latest problem no heat. The air conditioner works just fine. However when I turned on the heat today the furnace sounded like it was going to blow the house up. My wire colors are green, red, blue white. I have terminals for up to a 5 wire system. The jump wire is in the RC/RH spot as it should be. My other terminals are G, Y/O, W/B, and Y1. Much thanks in advance.
    tkrussell's Avatar
    tkrussell Posts: 9,659, Reputation: 725
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    #2

    Oct 11, 2006, 02:20 PM
    Red should be RC/RH power into the stat
    White should be W/B usually, for heat
    Green should be G for fan
    Yellow usually is for AC, blue may be Y/O

    Is there anyway you can trace these wires to be sure each is as I stated?

    You can, before connecting the new stat, put two wires together, only 24 volts so no worry about shock, try

    Red to green.. fan should start
    Red to white.. heat should start
    Red to blue... AC should start
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #3

    Oct 11, 2006, 02:35 PM
    TKrussel's answer should work. If you are not comfortable with the noise the furnace makes, post back describing the noise a little more and also your system, gas, oil, heat pump, etc.
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