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A/C / Heater question

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    #1

    A/C / Heater question

    So here is what I've got working. My A/C in my house runs just fine. No issues. My heater on the other hand is another story. It works, but only when my thermostat is set to the "On" position not in auto. I'm just about 98% certain when I moved my thermostat, I didn't put the wires back the way they were.I can't remember exactly how many wires I have running to the back of my thermostat but I believe it's four. For the life of me I can't find the right combo to make both units work on auto. Anyone have any suggestions? Figured I need to get this sorted out before I put my house on the market
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    #2
    You are on the right track looking for a thermostat wiring error. You should be able to find the installation manual for your thermostat online.

    Comment

      #3
      Originally posted by ken View Post
      You are on the right track looking for a thermostat wiring error. You should be able to find the installation manual for your thermostat online.


      I'm pretty sure that's what got me crisscrossed in the first place. My old thermostat wasn't wired into the corresponding colors and when I put the new in I went with colored wire to color receptacle.


      Sent from my iPhone using Tapatalk

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        #4
        Hang on. If you turn your thermostat in on the blower runs. That means blower relay is working. But in heat it does not. You have to turn on it works.

        Not thermostat. Is it gas or electric heat. And how old

        Comment

          #5
          Originally posted by enewman View Post
          Hang on. If you turn your thermostat in on the blower runs. That means blower relay is working. But in heat it does not. You have to turn on it works.

          Not thermostat. Is it gas or electric heat. And how old


          You lost me a little bit. Heat only works when I put select "on" for fan. Will not work in auto. A/C works no matter what. Electric unit. Inside unit is pretty old. Outside unit is about 8 years


          Sent from my iPhone using Tapatalk

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            #6
            Originally posted by WildMatt84 View Post
            You lost me a little bit. Heat only works when I put select "on" for fan. Will not work in auto. A/C works no matter what. Electric unit. Inside unit is pretty old. Outside unit is about 8 years


            Sent from my iPhone using Tapatalk
            Ok I got you. I thought heat would come on. Then you would have to turn on t stat. Miss understood.

            Call me 432 967 3706. To hard to do this over text

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              #7
              Rough drawing.
              Attached Files

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                #8
                Sounds like the Tstat maybe set for gas not electric. On air handlers with electric heat your tstat calls for fan as well as heat strips.

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                  #9
                  Very few electric furnaces need the thermostat to operate the fan (only ones I have seen in a 40yr. career that do are very old). Most operate the fan through the heat sequencers. You need a pro to look at this. Not a very big problem but a little too complicated to DIY. Careful, most electric furnaces have multiple power sources.

                  Comment

                    #10
                    Originally posted by double bogey View Post
                    Very few electric furnaces need the thermostat to operate the fan (only ones I have seen in a 40yr. career that do are very old). Most operate the fan through the heat sequencers. You need a pro to look at this. Not a very big problem but a little too complicated to DIY. Careful, most electric furnaces have multiple power sources.
                    Sounds like you have been doing it a while Electric furnaces. We call then electric air handlers now. Course I still call a refrigerator an ice box.

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