Dburton Posted August 19, 2022 Share Posted August 19, 2022 I have been out of town since July 1st and upon returning home half of my house had power the other half didn’t. Of course the refrigerator didn’t so that’s a thing… anyways I contacted GA power and they fixed it. BUT my thermostat still says no power, so the AC doesn’t work. It’s GA and August.. it’s hot. Any ideas? I am pretty technically advanced I just need guidance on what to do first. Thanks. Link to comment
Dburton Posted August 19, 2022 Author Share Posted August 19, 2022 Pictures of my nest thermostat. Link to comment
apostolakisl Posted August 19, 2022 Share Posted August 19, 2022 There is a low voltage transformer (24vac), typically located on/in your air handler box. It may need to be replaced. Link to comment
captainc Posted August 20, 2022 Share Posted August 20, 2022 just pull off the thermostat and see if your getting 24v ac on the c and r wires Link to comment
Brian H Posted August 20, 2022 Share Posted August 20, 2022 If it gets its 24VAC from a control board in the system. You may also want to see if the 24VAC protective fuse is blown. Link to comment
Dburton Posted August 20, 2022 Author Share Posted August 20, 2022 17 hours ago, captainc said: just pull off the thermostat and see if your getting 24v ac on the c and r wires 8 hours ago, Brian H said: If it gets its 24VAC from a control board in the system. You may also want to see if the 24VAC protective fuse is blown. I checked power at the fuse box outside and it’s good. Both fuses tone out with a meter. C and R wire has no voltage. Link to comment
apostolakisl Posted August 20, 2022 Share Posted August 20, 2022 (edited) 28 minutes ago, Dburton said: I checked power at the fuse box outside and it’s good. Both fuses tone out with a meter. C and R wire has no voltage. Like I said, you may need a new 24vac transformer. You need to locate it and check the voltage right at the transformer. Usually located mounted inside the air handler. They are cheap and easy to replace. Could be a fuse on the transformer also, but I suspect it is the transformer, these things are known to fail. EDIT: Could also be the 120vac going to the transformer. Either way, that is all checked out at the air handler. Edited August 20, 2022 by apostolakisl Link to comment
Dburton Posted August 20, 2022 Author Share Posted August 20, 2022 12 minutes ago, apostolakisl said: Like I said, you may need a new 24vac transformer. You need to locate it and check the voltage right at the transformer. Usually located mounted inside the air handler. They are cheap and easy to replace. Could be a fuse on the transformer also, but I suspect it is the transformer, these things are known to fail. EDIT: Could also be the 120vac going to the transformer. Either way, that is all checked out at the air handler. Ok thank you I will go out there and see if I can get into it. Link to comment
apostolakisl Posted August 20, 2022 Share Posted August 20, 2022 2 minutes ago, Dburton said: Ok thank you I will go out there and see if I can get into it. by "out there", I assume you mean this is in an outbuilding. Because if you are referring to something outside, that would be the condensing unit, not the air handler. The air handler would typically be in a basement, attic, or closet. Never outside. Link to comment
Dburton Posted August 20, 2022 Author Share Posted August 20, 2022 8 minutes ago, apostolakisl said: by "out there", I assume you mean this is in an outbuilding. Because if you are referring to something outside, that would be the condensing unit, not the air handler. The air handler would typically be in a basement, attic, or closet. Never outside. Ok yeah I was thinking of the whole unit outside. I’m not sure what a handler looks like but will google it now. I have a crawl space. I know that’s where I change my filters. Link to comment
Dburton Posted August 20, 2022 Author Share Posted August 20, 2022 10 minutes ago, apostolakisl said: by "out there", I assume you mean this is in an outbuilding. Because if you are referring to something outside, that would be the condensing unit, not the air handler. The air handler would typically be in a basement, attic, or closet. Never outside. Yesterday I went into my room to hit the light and fan, as soon as I pulled the string it popped loud and sparked and died on me. Smelt so bad. Link to comment
apostolakisl Posted August 20, 2022 Share Posted August 20, 2022 1 minute ago, Dburton said: Ok yeah I was thinking of the whole unit outside. I’m not sure what a handler looks like but will google it now. I have a crawl space. I know that’s where I change my filters. You might consider doing a whole lot of basic "how hvac works" videos or just hiring a professional. This isn't really something that someone who doesn't know the difference between an air handler and condensing unit should be doing. Link to comment
Dburton Posted August 20, 2022 Author Share Posted August 20, 2022 4 minutes ago, apostolakisl said: You might consider doing a whole lot of basic "how hvac works" videos or just hiring a professional. This isn't really something that someone who doesn't know the difference between an air handler and condensing unit should be doing. Like o said I have some technical abilities, I have AS in computer and electronics engineering. But never messed with HVAC. I watched a video on the air handler and when selecting the one you want to buy, you need to know the air flow. My dad comes into town tomorrow but just didn’t want to wait that long. Link to comment
Dburton Posted August 20, 2022 Author Share Posted August 20, 2022 2 hours ago, Dburton said: Ok thank you I will go out there and see if I can get into it. I am at and the wires that are coming from the condenser do not have any power on the board. Obviously neither do the blue and red going out from the board. Link to comment
tmorse305 Posted August 21, 2022 Share Posted August 21, 2022 17 hours ago, Dburton said: Yesterday I went into my room to hit the light and fan, as soon as I pulled the string it popped loud and sparked and died on me. Smelt so bad. You titled this thread Lost Neutral... but the problem you described sounded more like you lost one of the 120V feeds to the house. Did the power co. tell you what the problem was? If they said it was a neutral problem then you will likely find other things in the house that are dead or at least 'wounded'. This happened to a friend and he had things die weeks after the event. He was also able to make a claim against the power co. and was compensated for all of the damage. 2 Link to comment
MrBill Posted August 21, 2022 Share Posted August 21, 2022 (edited) @Dburton should really seek the help of a nest forum, or HVAC forum. While we can try to help, this thread is really off topic in this community, it has absolutely nothing to do with Universal-devices products or services not anything related really. One has to wonder why @Dburton chose to join this forum just to ask this question... the age of his profile seems to be the same as the question. Edited August 21, 2022 by MrBill 2 Link to comment
Brian H Posted August 21, 2022 Share Posted August 21, 2022 If you actually lost the Neutral and not one of the two Lines. All the loads in the home would try to handle the current through all the loads. Depending on how well the loads balanced. It would be possible some loads got an over voltage and others an under voltage. Possibly causing all kinds of damage from over or under voltages. On sensitive devices while others just handles it. One simple thing to do would be open the breaker panel feeding the HVAC and double check it is not tripped off. I second the calling a professional to evaluate the whole situation. Including an HVAC Company/ Technician. Link to comment
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