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Heat/ac problems after new thermostat install

Changing thermostats from intertherm to a hunter can't get the heat to run air will run however

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  • ericmccarson Sep 29, 2009

    I think there is something wired incorrectly with the new thermostat I put the old stat back up and the heat will run and ac runs however the heat won't run with the new stat. there is a wire that was not listed in the diagram for the new stat on the old one it's mark x and is a blue wire do you know what this is?



  • ericmccarson Sep 29, 2009

    are we talking about heat pumps or something else here

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  • Master
  • 2,923 Answers

Sometimes it gets corroded or clogged from years of coolant buildup. Have you checked the controls? When you change from cold to heat, does it feel very loose when you move it?

You need to check if the control is loose, you might need to change the control, check if there's a fuse that you need to replace and check the heater pipe to see if it's leaking.

Let me know what you would find.

Have a great day!

Posted on Sep 29, 2009

  • Melvin Ramos
    Melvin Ramos Sep 29, 2009

    The Blue wire should be connected to the gas valve. You need to check if you A/C-heater has a gas valve. If it has, then you need to connect that Blue wire to the gas valve.

    You have to make sure that the wiring is correct. Please let me know what you have in your heater.

    Thank you!


  • Melvin Ramos
    Melvin Ramos Sep 29, 2009

    I'm sorry, not the heater pump, but the gas valve. Check if you have a gas valve.

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