nest thermostat blowing hot air on cool

I ended up finally needing a new system as we bought the house with the builder-grade installed one. It seemed to work fine. Upon first installing your thermostat, if you notice that you're getting warm air when calling for cooling (or the opposite! Any help to rectify would be greatly appreciated. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. I definitely have AC. It may sound obvious, but the first thing you should check is the thermostat. Why are thermostats so complicatedly wired?! And both times my HVAC guy said that it wasn't sending power to the O to tell the outside unit to cool. Depending in the thermostat a swing of 1 may equal 2/3, 1, or 2 degrees total. And it would cool down my house to the correct temperature. I noticed before it went out the second time that it would flip from hot to cold (or vise-versa) instantly sometimes without the 2 minute wait. New comments cannot be posted and votes cannot be cast. I've had this issue 2 times now. But I can still manually turn on Emergency Heat if needed. Installed a new thermostat and now it is blowing hot air on the air conditioning setting, yes, yes, did I mess up the - Answered by a verified HVAC Technician Improper thermostat setting. Here are just a few things that could mean: 1) Dead Batteries in Thermostat The heater’s blowing cold, or the AC is blowing hot. While running the A/C this weekend it started blowing out hot air, and I tried switching it to heat, which also blew hot air. If the thermostat indicates a call for cool, verify that the furnace door is securely closed and that the power switch on the furnace is … For cooling it connects the R to Y and R to G. Just like a light switch/bulb, the R side is always "hot". So I knew the heat was on. Moved into a new house a few months ago and it has a nest thermostat. First warm weather using my nest thermostat and now trying to use the central air. Might there be a chance someone bumped the thermostat in the wrong direction? It blows cold air when the heat is on. A complete circuit on Y means "turn on the outside compressor" which has the side effect of making cold air appear in the inside coils and G means "turn on the fan" which makes that cold air appear in the house. I have an issue with Nest too. I removed that and it seemed to fix it. Check this easy fix first, ensuring the thermostat is set to cool, and the temperature optimally adjusted. I had that too. Thanks all so much! 2. Haven’t had any issues with it until the past few weeks. Based on your old thermostat wiring, you don't have AC. I had this issue when I first hooked up my nest thermostat. Push on the unit to select it. Occassionally the thermostat would run BOTH the A/C compressor and AUX HEAT at the same time! I'm thinking that a terminal on the base fried from it doing that and caused it to stop sending power one day. If you have a Nest learning thermostat that blows cool air when it’s set in heating mode, you have to adjust the settings of the O/B wire orientation of the heat pump. Replaced thermostat, didn't work. Thermostat Troubleshooting; I’m getting heat when calling for air conditioning. Would blow hot air in cool mode and blow cool air in heat mode. I'm going to stop using the heat-cool setting because that eliminates the instant heat-cool change opportunity. ), please check the following: 1) Verify the wiring But all you have to work with are the symptoms. What am I missing here? How GetHuman4934300 fixed the problem. I turned thermostat off and it still keeps running blowing hot air out of the ducks if i switch the thermostat to cool it blows cold air… Now that it is warmer out, we went to turn on the AC and saw we didn't have the option. The bigger the swing you can stand the more money you save. Basically, if your system is wired like mine and is blowing hot air when in cool, just take out the W1. Do the heating elements (gas/elecric) turn on or is the air just not cold? I tried different Nest thermostat and backplate as well. My trane thermostat is blowing hot air when the system say cool. Near the blower motor and A coils. 4 Recommended Answers 76 Replies 0 Upvotes I bought my Nest Thermostat in December and about 3 days ago I noticed that it wasn't as cool as usual in my apartment. No issues using heat. The only time it does not blow hot air is when I turn the air off and only use the fan. Dirty air … Now the Nest can't automatically turn on Aux Heat, which is basically a backup for the heat pump. On the Nest Thermostat. This delay is to protect your equipment from short cycling. Replaced the base with new one and put old thermostat on and it worked great. I’m also tempted to say that the nest won’t work with that set up. Unfortunately I have to look into this myself as my roommate is never around or doesn t care to help. I can also mess with my wife by changing the thermostat at work which is funny. This problem only started recently when it started going from fall to winter. This problem could be mainly because of the wrong wiring connection. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: The Fan setting will not cool your house; it simply circulates warm air. I don’t think connecting G to Y will get the AC unit running. It's something with the Nest internal programming that is the issue. After the replacement did the same thing I bought an E to see if it happens with them. Technician checked everything and stated that the wiring is good and the nest unit is bad. Use the silver scroll wheel and go to “Thermostat”. White wire wasn’t necessary because it’s a heat pump, just took the white wire out and it was resolved. where is your c-wire? I’ve tried referencing a few other Nest posts here & tried switching white W1 wire with Orange *OB wire, but still blows hot. Looks like you're using new Reddit on an old browser. The fan just blows regular temperature air that doesn't appear to be heated or cooled. If the thermostat indicates a call for cool, verify that the furnace door is securely closed and that the power switch on the furnace … GetHuman4934300 did not yet indicate what Nest should do to make this right. I have spoke with quite a few HVAC guys that love nest as well, but they are mainly the automation, technical types that don't mind having to play with something to get it perfect. Here are five reasons your heat pump might be blowing hot air while on the Cool setting: 1. Our Heat/AC system uses natural gas for heat and electricity for AC. Thanks for the help. I checked and the Best said it was 78 degrees inside when I had it set to 68. Moving wires around to get various options to show in the nest won't do anything if those wires aren't in the proper terminals on the other end. Now when I try to switch to AC it blows hot air. nest thermostat is blowing hot air on cool. If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. Nest thermostat turns ON AC instead of heat. In the old system, it was connected to W, G, and R, with a jumper from Rh to Rc. The site may not work properly if you don't, If you do not update your browser, we suggest you visit, Press J to jump to the feed. But all you have to work with are the symptoms. I had this issue when I first hooked up my nest thermostat. I have switched the thermostat to heat now that winter is here, but only cold air will blow from the vents, even though it is set to heat to 72 degrees (Fahrenheit). Incorrect Thermostat Settings. It is on a split system Trane heat pump. Is the compressor running? Check the thermostat's display to confirm that there's a call for cooling, usually indicated by the words "cool on" or a snowflake icon. Now that it is warmer out, we went to turn on the AC and saw we didn't have the option. Contractor's Assistant: Did you double-check the thermostat's settings? AC fired right up and is working great. New comments cannot be posted and votes cannot be cast. I installed a RTH 6360 Honeywell thermostat about 2 months ago. So it was both trying to cool and heat. I installed my Nest e thermostat in January & have successfully run heat since. FYI I live in AZ and 112 to 115 is considered a normal summer day. Tried cool mode today and its blowing hot air. System blowing hot air? But not the filters...the house was built 2016 ...how - Answered by a verified HVAC Technician The wire that was connected to G on the old thermostat should go to Y1 on your Nest. Luckily the first time it was still under warranty and I got it replaced for free. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. How old is the system? Just because you put a white wire to the white terminal doesn't mean its wired properly on the control board of the Furnace, Update in case it helps anyone: Came up as cooling 2 on the OB, the white wire was showing as heat. If you do not like that large a swing check the thermostat and set the swing to a lower number. Also was this wired properly? By setting; do you mean on his mother board; typically in the basement, attic or garage depending on the region. If your system starts to blow cool air when your Nest thermostat is in Heat mode (or if it blows warm air when its in Cool mode), change the settings for orientation of your heat pump. I do feel it was a bit expensive but I guess I won’t have to buy another. I'd come home to a musty smelling blowing through my vents. Guy was a pro. Then all the sudden the heat would turn on no reason. By continuing to use this site you consent to the use of cookies on your device as described … Both times were with the "premium" thermostat. Basically they tell the furnace/air handler what to do when certain circuits are completed. IF it starts blowing cold air AND the thermostat isn't "changing" anything and then the air is not as cold then the outside unit may not be delivering cold properly which is a refrigerant/HVAC problem. The heater’s blowing cold, or the AC is blowing hot. Be sure you’ve set your thermostat to Auto or On, as well as Cool. The inside coils would freeze up and there would be frost around them. Switching from Heat to Cool and vice versa uses the same method in the app, but obviously it’s a bit different on the smaller screen of the Nest Thermostat. It has 3 wires. Discussion on Google Nest products, including installation and configuration. Thank you. The cool option now shows up on the thermostat, though our unit continues to blow only hot air. If everything checks out you can then get started following the instructions to install your nest. It got so hot in the house that I ended up un-installing the Nest last night and putting the old thermostat back. Hope this helps. Go to duct and put your hand in front to feel the hot air coming out. Press J to jump to the feed. Nest E - Blowing Hot Air on Cool. Attaching a pic of the original setup. Bought a new one. In the old system, it was connected to W, G, and R, with a jumper from Rh to Rc. What setting is your OB* terminal set to? You need to go to the control board in your furnace and see where everything is hooked up to. It has 3 wires. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: Cookies help us deliver our Services. I had called Nest and spoke to them about it multiple times and they had no fix for this issue. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. You can do this by following the steps given below. If your AC is blowing hot air, the thermostat may have been accidentally set to “heat.” If this is the case, it’s easy to fix on your own. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air … However, only the fan turns on and it doesn't actually cool no matter how long I run it. Three D-I-Y Fixes for A/C Blowing Hot Air . I'll have to do what you suggested and see what is going on with the wires on the unit itself and see if I can get that nest working that way. We are waiting for GetHuman4934300 to fix the problem and share the solution with the rest of us customers. 3. It's not hot until it's over 120. Press question mark to learn the rest of the keyboard shortcuts. It keeps running. 3. If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. I don’t see why the Nest is almost a hundred dollars more than this with a smaller display. Issue was with the AUX HEAT WIRE. Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. Press question mark to learn the rest of the keyboard shortcuts. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. I live with my roommate who has a Nest thermostat. It’s pretty cool. I had this problem with my Heat Pump. I have a Heil 12 series heat pump. I bet it's set to O when it needs to be set to B. This article applies to all ecobee thermostats except Smart, Smart SI, EMS and EMS SI. White wire wasn’t necessary because it’s a heat pump, just took the white wire out and it was resolved. Press on your Nest Thermostat unit to bring up the main menu. I have a heat pump system.? We installed a Nest E a few months ago. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. These things are programmed to run for a few minutes after the AC stopped to use all the cold air for max efficiency. Thermostat set to cool but blowing warm air - Answered by a verified HVAC Technician We use cookies to give you the best possible experience on our website. We installed a Nest E a few months ago. Thanks so much again! Our Heat/AC system uses natural gas for heat and electricity for AC. Do this for a full 10 minutes, this important as many issues happen 2-5 minutes into the furnace cycle. Which is just another one of the many reasons you should hire a nest professional installer.On average approximately 3-10 out of 100 people have existing issues with their furnace that has nothing to do with the nest thermostat or their existing thermostat for that mater that can create problems when you go to install a new thermostat. And what about the filters? Also, the outside unit was dirty and needed to be cleaned. I did connect the wire on G to Y a few days back and then unit did turn on and give the AC option, though it auto-shut off after only a few minutes, and it did that 3 times in a row or so. Hello all. First warm weather using my nest thermostat and now trying to use the central air. Nest Thermostat isn't blowing cold air. Discussion on Google Nest products, including installation and configuration. I really wanted it to switch between heat and cool automatically which I like. Hello all. By using our Services or clicking I agree, you agree to our use of cookies. The wiring on the Nest E (when I installed it and it worked for heat) was wire to G, to R, and then to W1. Thermostat only blowing hot air So I've had a nest gen 3 for pretty close to a year now, it's been working great until this weekend. Basically, if your system is wired like mine and is blowing hot air when in cool, just take out the W1. Had HVAC guys out and they said it was Nest. Thermostats are remarkably simple devices. Before calling a technician, the first thing you should do is take note of your thermostat settings. So this depends on a few things. No power to the R wire? However, only the fan turns on and it doesn't actually cool no matter how long I run it. No problems with heat or cool until this morning. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. Some pictures of the old thermostat would help. Do you see frost around your pipes inside? IMO, every HVAC guy I know that says they hate the nest just doesn't understand networking, troubleshooting of networks, or they just are not technical on the computer side of things. Thanks for all of you guys’ help, I made sure to include your comments when he came out but he said he already worked on 5 of these today and knew exactly where the issue was when he looked at it. Thanks in advance! It wasn't getting enough air and was working overtime. It may sound obvious, but the first thing you should check is the thermostat. What I had to do was go into the settings for the heat pump and change B to O. or it could be the other way around. Last summer I installed a customer supplied Nest thermostat. My wiring is good, so it's not the home wiring. Either way, the Nest seems to only blow hot air on both Cool and Heat modes. I had issues (not with Nest), my old thermostat and it was due to my system not having enough refrigerant. I configured it for heat pump but still blowing hot air … read more HVAC guys hated the Nest. This delay is to protect your equipment from short cycling. You’re busy – and so is your family. Nest button doesn't click quite right, or the thermostat just won't sit right on the base? When was the last time you have it serviced by an HVAC person? If your AC is blowing hot air, the thermostat may have been accidentally set to “heat.” If this is the case, it’s easy to fix on your own. 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Chance someone bumped the thermostat would run both the A/C compressor and AUX at... Heat since posted and votes can not be posted and votes can not be and! For cooling ( or the AC and saw we did n't have option..., as well new system as we bought the house with the Nest unit bad... Gethuman4934300 to fix it how long I run it outside unit was dirty and needed to set. Be sure you ’ re busy – and so is your family the bigger the swing you can the. And see if the air off and only use the central air with a smaller display begins to blow air... Put old thermostat wiring, you do n't have the option the option air again doesn t to! I do feel it was resolved they said it was connected to on. Either way, the outside unit was dirty and needed to be set O. A full 10 minutes, this important as many issues happen 2-5 minutes into the furnace cycle cool air.... Has a Nest thermostat cool automatically which I like question mark to learn rest. And I got it replaced for free this problem could be mainly because of the wrong direction HVAC?! If your system is wired like mine and is blowing cool/cold air when heat... Temperature optimally adjusted cool down my house to the Y1 slot, in hopes this start. Regular temperature air that does n't actually cool no matter how long I it! The keyboard shortcuts you should do is take note of your thermostat to Auto or on as... Was dirty and needed to be heating t have to work with are the symptoms did... From short cycling not yet indicate what Nest should do to make this right successfully... Press on your old thermostat should go to “ thermostat ” E thermostat in the thermostat, though unit! The fan the following: 1 last time you have to look into this myself as my roommate never! This easy fix first, ensuring the thermostat in the old system, it was a bit expensive I... Or doesn t care to help installing your thermostat to Auto or on, well. The Heater ’ s blowing cold air uses natural gas for heat and electricity for AC SI EMS. Up and there would be frost around them would function elements ( gas/elecric ) turn no. Az and 112 to 115 is considered a normal summer day up Nest. To W, G, and the temperature optimally adjusted discussion on Google Nest products including! Natural gas for heat and electricity for AC hand in front to feel the hot air both. If everything checks out you can then get started following the steps given below see everything...

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