Question about Honeywell Programmable Thermostat Heater

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Honeywell RTH3100C I have on old White-Rodgers 4 wire single transformer system I believe. Model 1F76W357. I am installing a Honeywell RTH3100C non programmable thermostat. Wires on the White-Rodgers are: RC RH (Jumpered inside the thermostat) W Y G Wires on the Honneywell are: E AUX Y G O L R B C I tried to hook it up like this: RC/RH = R on the Honeywell (RC and RH are 1 wire out of wall) W = AUX on the Honeywell Y = Y on the Honeywell G = G on the Honeywell When I turned the heater, after 3 minuts the AC Kicked on. Online, I have learned that on the old White Rogers these wire are: Y=Cooling System G=Fan Relay W=Heating System RC/RH=24v Hot So I tried a couple of other combos and no luck, I just cant figure out the whole RC/RH thing. Please let me know if there is an expect that can help. KMC

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You are on the right track, however, the biggest problem I see is that the new Honeywell thermostat that you have is for a heat pump system and judging off your old thermostat, you don't have a heat pump. A heat pump system requires more wires and different terminals for the extra components it has like the reversing valve and such and since you don't have any of those, your thermostat is trying to tell the old unit to do things it simply cannot do. Your wire colors are correct as you described and on a standard thermostat you will have the same terminals as you do now. C/B(Blue)= is common by the way. One way to look at the RC/RH terminals is to think of it as both 24v, one being for heat(H), and one for cool(C). When they are jumped together, it allows the thermostat to use one wire for power instead of two (Red). Hope this helps and good luck!

Posted on Jul 14, 2010

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RC - power for cooling
RH - power for heat
since you have only one transformer you need to put a jumper with this two terminals.
RC/RH - R ( power )
G - G ( fan relay)
W - Aux ( heat relay)
Y - Y ( cool relay )
this is so simple if the Honeywell thermostat is doing erratic operation maybe you need to reset the thermostat.

Posted on Sep 15, 2009

  • Joselito Laxamana
    Joselito Laxamana Apr 07, 2010

    The main reason why the RC/RH terminal has a jumper in between. IF you are using a single transformer you must used a jumper to power the RC (power for cool) and RH (power for heat).
    I think you need to call Honeywell so that they can help you with the problem, you know the function of each wires so this will be a piece of cake for them. Here's their number 18004681502
    Link:https://yourhome.honeywell.com/home/Appl...

  • Joselito Laxamana
    Joselito Laxamana Apr 26, 2010

    RC - power for cooling

    RH - power for heat

    since you have only one transformer you need to put a jumper with this
    two terminals.

    RC/RH - R ( power )

    G - G ( fan relay)

    W - Aux ( heat relay)

    Y - Y ( cool relay )

    this is so simple if the Honeywell thermostat is doing erratic operation
    maybe you need to reset the thermostat.

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You need to go into the installer setting to change it from heatpump to single stage gas heat.Go to www.honeywell.com if youve lost them.

Posted on Mar 12, 2009

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