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RTH2520B Honeywell Programable Thermostat wires

Had the thermostat hook up for several months and it worked fine. When I took it off to paint the wall, the wires came out before I could see from where. I have only a black and a white wire coming from the wall. I've tried all sorts of combinations of hooking these wires up again but none work properly: the thermostat makes the furnace heat its hottest all the time and the temperature stays between 79 and 81, even when I turn on the off button.  The choices of places to hook up the wires are labelled: RH RC W Y G Does anyone know what these letters stand for, if not where to put those two wires? Thank you.

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  • soozankrayg Jan 28, 2009

    Thank you so much Tactup! The problem is now completely solved, and it's finally beginning to cool down in here. 
    Best Regards,
    susan

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Hi soozankrayg!
Your problem should be pretty simple. (assuming that it is a typical 24volt system) you should hook up the black wire to the "RH" terminal and the white wire on the "w" terminal. Make sure that you turn off the power to the furnace at the breaker or the furnace itself before attempting this. The reason for this is that you can cause a short and either break the fuse at the furnace or burn up the circuit board. This can happen very quickly and is very common when a thermostat is removed.

Posted on Jan 28, 2009

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