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Replacing a Seco 24 VAC Heat pump thermostat TA2000

My old mercury thermostat has W2-white, O-orange, X-blue, R-red, Y-yellow, and G-green wires. My new thermostat has E, AUX, Y, G, O, L, R, B, and C. I think W2 is AUX, Y-Y, G-G, O-O, R-R, but I don't know where my X-blue wire goes. Can anyone help me?

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  • Vicki LaVoilette Jan 03, 2013

    The new thermostat is a Honeywell RTH3100C...Non Programmable. I do have a heat pump.

  • Vicki LaVoilette Jan 03, 2013

    I'm thinking W2 = Aux, Y = Y, G = G, O = O, L is Not used, R = R, B is Not used, and C is optional if I use a battery. Do I jumper E to AUX?



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Posted on Jan 02, 2017

  • 96 Answers

SOURCE: Upgrading Thermostat

Looks like your system is a heatpump system and that t-stat will not run a heatpump , you need a t-stat for 2heat and 1 cool systems

Posted on Feb 01, 2009

  • 520 Answers

SOURCE: wireing a honeywell thermostat

Bill ..You dont have a heat pump.This controller will not work for a conventional system. Get the right thermostat

Posted on Jul 24, 2009

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SOURCE: No Auxiliaty heat with new thermostat

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.

Posted on Nov 16, 2009

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