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    deb1797's Avatar
    deb1797 Posts: 1, Reputation: 1
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    #1

    Nov 15, 2010, 07:48 PM
    Installing a 2 wire thermostat
    I have a very old house and the two wires to my thermostat are white and black. I hooked the white to W and the black to R. I got heat, but the heat did not turn off and continued to run even after the temperature far exceeded what the thermostat was set at. Could it be that the I attached the wrong wires to the W and the R. Thank you.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #2

    Nov 16, 2010, 09:11 AM
    Depending on the t'stat model, there may be a jumper on heat only-2 wire units. See if there is a red jumper wire between Rc and Rh. Disconnect the jumper and try again. Let us know if it works.
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