Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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I've tried to install a Honeywell 7500 thermostat. I believe I have it wired correctly. I have Red - R Yellow - Y Orange - O Blue - C Brown - X White - Aux

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  • Joseph Lillie
    Joseph Lillie May 11, 2010

    What is your question? That should be correct

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  • 34 Answers

The colors aren't all that important.  make sure the letters on the thermostat and the letters on the furnace control board have the same wire connected.  that's all you need to do.

Posted on Dec 06, 2008

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I am trying to install a Honeywell RTH2300B thermostat. I can't get the wiring. I have a red, blue orange, green, yellow, brown and white wire and B, O, G, Y, W, Not Used, R, and RC terminals. Can


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The wiring your describing on the old thermostat is telling me you have a heat pump with second stage heat and the new thermostat is for air conditioning only. You will need to get a thermostat for a heat pump.

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1 Answer

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The Vision Pro is a great t-stat and I have installed many of them with great results. I am wondering though if it is set up correctly. Did you go in and make sure that it is set for heat pump and for 2 stage heating? Look on the instructions how to get into the advance installer options. Go through that meanu and make sure that everything ig set correctly for your type of heating system and that it is set for 2 stage heating. From what you have here and I can tell the wiring should be okay that is why I think that it is in the t-stat programming.

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Old wiring looks like this yellow =y1 green =G white=w2 orange =O blue=C red=R installing a Honeywell RTH7600 where does the orange wire go we have a heatpump.L


If you have a heat pump, the thermostat that will operate it most generally will have an "O' terminal for the orange wire, this is the circuit that energizes the reversing valve on the heat pump, be sure that the stat says heat pump on the box. hope this helps

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1 Answer

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rh is hot for heating rc is hot for cooling looks to me like ya need a heat pump stat some thing to control the reversing valve.Tom

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