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

    Nov 10, 2011, 09:25 AM
    Honeywell thermostat wire color differences
    I am replacing a thermostat with a new Honeywell Programmable 5-1-1 model RTH7400D.
    I have a red, green, white and blue wire currently. How should these be hooked up when they're asking for a red, green, white and yellow?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Nov 10, 2011, 09:59 AM
    Do you have ac? If so its likely the blue wire is replacing the yellow wire that tstat is asking for.
    Be sure to turn off power/breaker to furnace before replacing tstat
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