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I want to know if i can replace a carrier C024509H01 with a mco mh8-fc thermostat? only 3 cables reach to the carrier thermostat... are they enough to feed the mco thermostat?

Posted by marbellait on

  • Thomas Woodburn
    Thomas Woodburn May 10, 2017

    Sorry, I found it. Looks like a basic tstat. Where on the tstat are your wires landed?? What letters, please??

  • Thomas Woodburn
    Thomas Woodburn May 14, 2017

    Looks like the valve will go to O and C. Not familiar with that type, sorry



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Thomas Woodburn

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I'm not seeing your carrier tstat, is that the model number?

If you need further help, reach me via phone at

Posted on May 10, 2017

Testimonial: "The carrier termostat is a 40SMC028N. I looked power directly from the board to feed the new tstat (MCO MH-8) L and N connectors. Then I disconnected the fan connector from the mainboard (INDOOR FAN - 3 cables) and connected it to the MCO HI,ME and LO connectors. I can hear the fans starting when I order it from the new tstat. I hope I'm doing everything well up to these point. Now I need to connect the Valve ON / OFF connectors from the new stat to the carrier and I don't know where to get the signal out on the carrier board (maybe from the CDU connection).Any suggestion??"

  • marbellait
    marbellait May 14, 2017

    I'm taking the signal from the internal board off and connecting the new stat directly to the indoor/outdoor units interconnections.

  • marbellait
    marbellait May 14, 2017

    Ceiling Unit Carrier 40SMC028N, Room Controller Carrier EB6005, External Unit 38YY-028G - New Thermostat MCO MH-8-FC



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