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Thread: thermostat--wiring

  1. #1
    millwork specialist@home depot danl02026's Avatar
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    Oct 2009
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    Default thermostat--wiring

    I was helping a friend rewire a dead thermostat--we rewired the the new thermostat it only had four wires for the old one and we put the wires where the color are supposed to go..but the air conditioner fan outside is running. Is it supposed to? my friend said he never noticed it before doing that! any help would be welcomed..

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
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    Did you notice where the wires were on the old one? They may not have been hooked up to the 'proper' color. The a/c is normally the yellow wire (if I remember correctly). If it is on the fan control terminal, or you have a tail or strand shorted to more than one terminal, that could cause it. Take a close look, and make sure the wire is wrapped around only one terminal and isn't hitting two. You don't want the a/c running while you need heat (unless it is a heat pump!).
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    Journeyman & Gas Fitter Doherty Plumbing's Avatar
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    Quote Originally Posted by jadnashua View Post
    Did you notice where the wires were on the old one? They may not have been hooked up to the 'proper' color. The a/c is normally the yellow wire (if I remember correctly). If it is on the fan control terminal, or you have a tail or strand shorted to more than one terminal, that could cause it. Take a close look, and make sure the wire is wrapped around only one terminal and isn't hitting two. You don't want the a/c running while you need heat (unless it is a heat pump!).
    The colours of the wire mean nothing.

    What you need to do is check @ the furnace to see where each wire is hooked up and then hook them up to the thermostat in the same fashion.

    Never trust the colours of the wire.

  4. #4
    Plumber jimbo's Avatar
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    Thanks for giving us a follow up on your problem. I think you have proved the value of something I have always been taught: VISUAL troubleshooting is the best first step. You found your white wire problem and your empty tank!

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