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    rulez's Avatar
    rulez Posts: 5, Reputation: 1
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    #1

    Aug 4, 2010, 07:31 PM
    Replacing t8411r with rth230b
    Hello,

    I purchased a Honeywell rth230b to replace my Honeywell t8411r. When I removed the t8411r I had 6 wires coming out of my wall that were attached to the thermostat. A red, blue, green, white, and 2 yellows. The 2nd yellow is coming from a second set of wires that all have the same color, but the rest are pushed back and were not used. I cannot figure out how to wire this thing up with this extra yellow. I have no idea what it is for. It was attached to the "O" screw on the old thermostat plate. I can't even find out what that "O" was used for on the old thermostat.

    Can anyone help?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Aug 4, 2010, 08:04 PM

    Do you have a heatpump? Normally the o is the wire going to energize the reversing valve
    rulez's Avatar
    rulez Posts: 5, Reputation: 1
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    #3

    Aug 4, 2010, 08:16 PM
    Quote Originally Posted by rulez View Post
    Hello,

    I purchased a Honeywell rth230b to replace my Honeywell t8411r. When I removed the t8411r I had 6 wires coming out of my wall that were attached to the thermostat. A red, blue, green, white, and 2 yellows. The 2nd yellow is coming from a second set of wires that all have the same color, but the rest are pushed back and were not used. I cannot figure out how to wire this thing up with this extra yellow. I have no idea what it is for. It was attached to the "O" screw on the old thermostat plate. I can't even find out what that "O" was used for on the old thermostat.

    Can anyone help?
    Update:

    I got everything working except for the heat. The fan blows and the AC works. I have it hooked up as follows:

    Rh - Blue
    Rc - Red
    W - White
    Y - Both Yellows
    G - Green

    Before I had the blue and red reversed. I was searching around and saw something about the "O" on the old thermostat being for a heat pump? I am assuming this is why my heat isn't working. Is that separate yellow for the heat only? If so, where should I put it?
    rulez's Avatar
    rulez Posts: 5, Reputation: 1
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    #4

    Aug 4, 2010, 08:17 PM
    Quote Originally Posted by wmproop View Post
    do you have a heatpump? normally the o is the wire going to energize the reversing valve
    Hey, I made that last post before I saw yours. I am assuming I do. I recently bought this house so I am not sure. Is there a way I can check?

    Assuming I do have a heat pump, how would I wire it correctly?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #5

    Aug 4, 2010, 08:34 PM

    Check your install instructions, should it have a jumper from rh to rc?
    rulez's Avatar
    rulez Posts: 5, Reputation: 1
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    #6

    Aug 5, 2010, 05:18 AM

    No, it says for 5-wire installation to remove the jumper.

    But, in the instructions it clearly says that this thermostat will not work with a heat pump. My wife thinks that we don't have a heat pump though, since we have central air and have only one unit in the garage that controls both operations.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #7

    Aug 5, 2010, 06:43 AM

    Does your thermostat have a EM /emergency heat setting? The old tstat?
    rulez's Avatar
    rulez Posts: 5, Reputation: 1
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    #8

    Aug 6, 2010, 04:04 AM

    No, not that I am aware of. I am at a loss here :(
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