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    garrettcox58's Avatar
    garrettcox58 Posts: 2, Reputation: 1
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    #1

    Nov 27, 2012, 06:26 PM
    I have a new honeywell theromostat I just installed and the display won't come on
    Its brand new and I did follow the directions what could I try next to fix it
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #2

    Nov 27, 2012, 07:07 PM
    What is the model number of the stat & to which terminals are wires connected?
    garrettcox58's Avatar
    garrettcox58 Posts: 2, Reputation: 1
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    #3

    Nov 27, 2012, 07:20 PM
    Only 4 wires... Green wire is on G... Yellow is on Y red is on RC and white is on W
    Grady White's Avatar
    Grady White Posts: 1,417, Reputation: 59
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    #4

    Nov 29, 2012, 07:44 PM
    Quote Originally Posted by garrettcox58 View Post
    Only 4 wires... Green wire is on G... Yellow is on Y red is on RC and white is on W
    Unless the thermostat has batteries, you probably need to run a wire from the common terminal on the furnace to the "C" terminal on the stat. What is the model number of the stat? I need that to look up a wiring diagram.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #5

    Nov 30, 2012, 05:36 AM
    If you didn`t turn off the breaker before install you might have fried the transformer ( hence there is no 24 volts coming to the tstat) with fried transformer
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