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

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