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    eliz310's Avatar
    eliz310 Posts: 22, Reputation: 1
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    #1

    Apr 25, 2009, 05:26 PM
    Installing a Honeywell RTH6400 thermostat
    We have installed a new thermostat. Could someone help me figure out if we have everything hooked up correctly? We have a Red wire connected to Rc with a jjump wire between R & Rc, Yellow connected to Yellow, White connected to white & blue (don't know what to hook it up to).
    Joshdta's Avatar
    Joshdta Posts: 2,549, Reputation: 45
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    #2

    Apr 25, 2009, 06:01 PM

    Still no luck. Sometimes blue is used one y instead of yellow. But you would have to look at the control board in the furnace to see what wires are connected where.
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    eliz310 Posts: 22, Reputation: 1
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    #3

    Apr 25, 2009, 06:09 PM

    Yeah, still no luck. There is a hold up somewhere, is it normal to have 3 wires connected instead of 4?
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    Joshdta Posts: 2,549, Reputation: 45
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    #4

    Apr 25, 2009, 06:20 PM

    Do you not have a green?
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    Joshdta Posts: 2,549, Reputation: 45
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    #5

    Apr 25, 2009, 06:20 PM
    Your really only need r w and y if you have a newer unit
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    eliz310 Posts: 22, Reputation: 1
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    #6

    Apr 25, 2009, 07:04 PM

    I'm not sure how old this unit is. Yes we have a green.
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    eliz310 Posts: 22, Reputation: 1
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    #7

    Apr 25, 2009, 07:07 PM
    We have blue, green, red, white. Sorry I'm an idiot, no yellow.
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    Joshdta Posts: 2,549, Reputation: 45
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    #8

    Apr 25, 2009, 08:06 PM

    No yellow? Then hook blue to y and you should be fine.
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    T-Top Posts: 1,871, Reputation: 100
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    #9

    Apr 25, 2009, 08:13 PM
    How did the old thermostat hook up. Did you have a R,W,Y on the old one?
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    eliz310 Posts: 22, Reputation: 1
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    #10

    Apr 25, 2009, 08:33 PM

    No Red, white, green & blue. We will try the blue in the y & see what happens!
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    Joshdta Posts: 2,549, Reputation: 45
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    #11

    Apr 25, 2009, 08:35 PM

    It should work fine with the blue hooked to y, it is used that way anytime there is only 4 wires not 5
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    KISS Posts: 12,510, Reputation: 839
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    #12

    Apr 25, 2009, 08:35 PM

    With 4 wires you can connect any two and note what happens:

    X B G R W
    B
    G
    R
    W

    1. nothing
    2. Outside unit runs
    3. Heat comes on and fan a little later
    4. The fan runs

    From that, we can figure out the colors.
    eliz310's Avatar
    eliz310 Posts: 22, Reputation: 1
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    #13

    Apr 25, 2009, 08:43 PM
    We got it! Thank you so much!
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    Joshdta Posts: 2,549, Reputation: 45
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    #14

    Apr 25, 2009, 08:47 PM

    Great glad you finally got it. I was confused earlier I thought you had a yellow wire.
    T-Top's Avatar
    T-Top Posts: 1,871, Reputation: 100
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    #15

    Apr 25, 2009, 09:02 PM
    One good thing you got going on with only three wires you have no common wire from the transformer so you can't blow or destroy any part. It may take six tries but I bet you get it.
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