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  1. #1
    Join Date
    Oct 2019
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    Carrier to Honeywell Thermostat Wiring Help Needed

    I have a Carrier thermostat that has begun to malfunction. I believe it was installed in 2003. I have a Puron system with two units and one transformer. The heating system is a gas furnace. The first two photos are of the Carrier thermostat with two wiring blocks and the system has two wire harnesses.

    The first photo is a picture of the circuit board on the unit associated with the thermostat in question.

    The primary harness has all wires used. All but one was hooked up to the top wiring block:

    Red - R
    Green - G
    White - W/W1
    Yellow - Y/Y2

    The only wore from the primary harness to the other block was the common:

    Blue - C

    The wires used on the other harness only included red, green, white and yellow:

    White - S1
    Red - S2
    Yellow - DHUM
    Green - O/W2 (only wire hooked to the top block.

    The Honeywell thermostat has one block and the model is Model # RTH6580WF1001/U1. The block has terminals for K, Y2, W2, G, W, Y, C, R, and RC.

    Please share advice on matching the wires to the terminal block, thx.

  2. #2
    Join Date
    Dec 2003
    Citrus County, Florida
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    This is not a DYI site due to liability. Do yourself a favor and call a qualified tech. The board you save may be your own.

  3. #3
    Join Date
    Dec 2007
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    You are in way over your head, in more ways than you know.
    Call a qualified Carrier dealer/tech to explain why?
    The Food Stamp Program, administered by the U.S. Department of Agriculture, is proud to be distributing the greatest amount of free meals and stamps EVER.
    Meanwhile, the National Park Service, administered by the U.S. Department of the Interior, asks us to "Please Do Not Feed the Animals". Their stated reason for this policy "... the animals become dependent on handouts and will not learn to take care of themselves."
    from an excerpt by Paul Jacob in Sun City, AZ

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