This delay is to protect your equipment from short cycling. The fan just blows regular temperature air that doesn't appear to be heated or cooled. I definitely have AC. My wiring is good, so it's not the home wiring. 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. You’re busy – and so is your family. Occassionally the thermostat would run BOTH the A/C compressor and AUX HEAT at the same time! It has 3 wires. I have an issue with Nest too. ), please check the following: 1) Verify the wiring Contractor's Assistant: Did you double-check the thermostat's settings? I configured it for heat pump but still blowing hot air … read more Nest Thermostat isn't blowing cold air. We installed a Nest E a few months ago. I tried different Nest thermostat and backplate as well. Press J to jump to the feed. 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. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. It is on a split system Trane heat pump. But I can still manually turn on Emergency Heat if needed. When was the last time you have it serviced by an HVAC person? First warm weather using my nest thermostat and now trying to use the central air. Based on your old thermostat wiring, you don't have AC. Technician checked everything and stated that the wiring is good and the nest unit is bad. How old is the system? Had HVAC guys out and they said it was Nest. Now when I try to switch to AC it blows hot air. So this depends on a few things. nest thermostat is blowing hot air on cool. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. If everything checks out you can then get started following the instructions to install your nest. This article applies to all ecobee thermostats except Smart, Smart SI, EMS and EMS SI. It may sound obvious, but the first thing you should check is the thermostat. Bought a new one. Thermostats are remarkably simple devices. Go to duct and put your hand in front to feel the hot air coming out. 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 Either way, the Nest seems to only blow hot air on both Cool and Heat modes. Luckily the first time it was still under warranty and I got it replaced for free. 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. Basically, if your system is wired like mine and is blowing hot air when in cool, just take out the W1. Discussion on Google Nest products, including installation and configuration. The only time it does not blow hot air is when I turn the air off and only use the fan. I had issues (not with Nest), my old thermostat and it was due to my system not having enough refrigerant. No power to the R wire? Both times were with the "premium" thermostat. But not the filters...the house was built 2016 ...how - Answered by a verified HVAC Technician There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. 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. Tried cool mode today and its blowing hot air. It seemed to work fine. Thanks so much again! 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). On the Nest Thermostat. We installed a Nest E a few months ago. 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'd come home to a musty smelling blowing through my vents. Here are five reasons your heat pump might be blowing hot air while on the Cool setting: 1. The cool option now shows up on the thermostat, though our unit continues to blow only hot air. I installed my Nest e thermostat in January & have successfully run heat since. If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. Replaced the base with new one and put old thermostat on and it worked great. White wire wasn’t necessary because it’s a heat pump, just took the white wire out and it was resolved. Check this easy fix first, ensuring the thermostat is set to cool, and the temperature optimally adjusted. It has 3 wires. Thanks for the help. It keeps running. Nest E - Blowing Hot Air on Cool. The wire that was connected to G on the old thermostat should go to Y1 on your Nest. 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. Attaching a pic of the original setup. I don’t think connecting G to Y will get the AC unit running. The heater’s blowing cold, or the AC is blowing hot. I had this issue when I first hooked up my nest thermostat. 3. Hello all. Last summer I installed a customer supplied Nest thermostat. I installed a RTH 6360 Honeywell thermostat about 2 months ago. Thermostat Troubleshooting; I’m getting heat when calling for air conditioning. Also was this wired properly? Discussion on Google Nest products, including installation and configuration. It got so hot in the house that I ended up un-installing the Nest last night and putting the old thermostat back. Do the heating elements (gas/elecric) turn on or is the air just not cold? Thank you. I’ve tried referencing a few other Nest posts here & tried switching white W1 wire with Orange *OB wire, but still blows hot. I removed that and it seemed to fix it. 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. Looks like you're using new Reddit on an old browser. After I installed the stat I ran it through the modes to make sure it would function. How GetHuman4934300 fixed the problem. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. 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's not hot until it's over 120. 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. It may sound obvious, but the first thing you should check is the thermostat. I’m also tempted to say that the nest won’t work with that set up. Hope this helps. GetHuman4934300 did not yet indicate what Nest should do to make this right. The heater’s blowing cold, or the AC is blowing hot. What setting is your OB* terminal set to? 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. Moved into a new house a few months ago and it has a nest thermostat. Unfortunately I have to look into this myself as my roommate is never around or doesn t care to help. Thanks all so much! I had this problem with my Heat Pump. 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 … I can also mess with my wife by changing the thermostat at work which is funny. Here are just a few things that could mean: 1) Dead Batteries in Thermostat But all you have to work with are the symptoms. Haven’t had any issues with it until the past few weeks. Push on the unit to select it. Now that it is warmer out, we went to turn on the AC and saw we didn't have the option. FYI I live in AZ and 112 to 115 is considered a normal summer day. Thanks in advance! So I decided to go out and buy a nest thermostat. My trane thermostat is blowing hot air when the system say cool. Dirty air … We are waiting for GetHuman4934300 to fix the problem and share the solution with the rest of us customers. Do you see frost around your pipes inside? The Fan setting will not cool your house; it simply circulates warm air. In the old system, it was connected to W, G, and R, with a jumper from Rh to Rc. 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. And it would cool down my house to the correct temperature. No issues using heat. Now the Nest can't automatically turn on Aux Heat, which is basically a backup for the heat pump. 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. Replaced thermostat, didn't work. AC fired right up and is working great. Issue was with the AUX HEAT WIRE. 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. Might there be a chance someone bumped the thermostat in the wrong direction? 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. 3. The inside coils would freeze up and there would be frost around them. It wasn't getting enough air and was working overtime. 2. The bigger the swing you can stand the more money you save. 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. Use the silver scroll wheel and go to “Thermostat”. This delay is to protect your equipment from short cycling. Why are thermostats so complicatedly wired?! However, only the fan turns on and it doesn't actually cool no matter how long I run it. It blows cold air when the heat is on. 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. You need to go to the control board in your furnace and see where everything is hooked up to. What am I missing here? So I knew the heat was on. 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. Then all the sudden the heat would turn on no reason. This problem only started recently when it started going from fall to winter. Improper thermostat setting. Is the compressor running? Press question mark to learn the rest of the keyboard shortcuts. Our Heat/AC system uses natural gas for heat and electricity for AC. Here are just a few things that could mean: 1) Dead Batteries in Thermostat By setting; do you mean on his mother board; typically in the basement, attic or garage depending on the region. Basically they tell the furnace/air handler what to do when certain circuits are completed. It’s pretty cool. 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. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air … I have a Heil 12 series heat pump. 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. And both times my HVAC guy said that it wasn't sending power to the O to tell the outside unit to cool. For cooling it connects the R to Y and R to G. Just like a light switch/bulb, the R side is always "hot". Press on your Nest Thermostat unit to bring up the main menu. But all you have to work with are the symptoms. And what about the filters? I have a heat pump system.? 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. New comments cannot be posted and votes cannot be cast. By continuing to use this site you consent to the use of cookies on your device as described … New comments cannot be posted and votes cannot be cast. Be sure you’ve set your thermostat to Auto or On, as well as Cool. By using our Services or clicking I agree, you agree to our use of cookies. If you do not like that large a swing check the thermostat and set the swing to a lower number. Would blow hot air in cool mode and blow cool air in heat mode. Some pictures of the old thermostat would help. In the old system, it was connected to W, G, and R, with a jumper from Rh to Rc. Any help to rectify would be greatly appreciated. Press question mark to learn the rest of the keyboard shortcuts. Also, the outside unit was dirty and needed to be cleaned. I do feel it was a bit expensive but I guess I won’t have to buy another. Incorrect Thermostat Settings. Depending in the thermostat a swing of 1 may equal 2/3, 1, or 2 degrees total. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. Nest thermostat turns ON AC instead of heat. 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 had this issue when I first hooked up my nest thermostat. I really wanted it to switch between heat and cool automatically which I like. First warm weather using my nest thermostat and now trying to use the central air. Basically, if your system is wired like mine and is blowing hot air when in cool, just take out the W1. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: These things are programmed to run for a few minutes after the AC stopped to use all the cold air for max efficiency. I had that too. 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. 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. I ended up finally needing a new system as we bought the house with the builder-grade installed one. If the thermostat indicates a call for cool, verify that the furnace door is securely closed and that the power switch on the furnace … You can do this by following the steps given below. HVAC guys hated the 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. Nest button doesn't click quite right, or the thermostat just won't sit right on the base? I don’t see why the Nest is almost a hundred dollars more than this with a smaller display. Hello all. Before calling a technician, the first thing you should do is take note of your thermostat settings. System blowing hot air? where is your c-wire? I checked and the Best said it was 78 degrees inside when I had it set to 68. No problems with heat or cool until this morning. I'm going to stop using the heat-cool setting because that eliminates the instant heat-cool change opportunity. Three D-I-Y Fixes for A/C Blowing Hot Air . 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. Help! I'm thinking that a terminal on the base fried from it doing that and caused it to stop sending power one day. I had called Nest and spoke to them about it multiple times and they had no fix for this issue. 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… If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. So it was both trying to cool and heat. Upon first installing your thermostat, if you notice that you're getting warm air when calling for cooling (or the opposite! Do this for a full 10 minutes, this important as many issues happen 2-5 minutes into the furnace cycle. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: I bet it's set to O when it needs to be set to B. Guy was a pro. Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. Now that it is warmer out, we went to turn on the AC and saw we didn't have the option. This problem could be mainly because of the wrong wiring connection. Cookies help us deliver our Services. However, only the fan turns on and it doesn't actually cool no matter how long I run it. Our Heat/AC system uses natural gas for heat and electricity for AC. I then moved the W1 wire to the Y1 slot, in hopes this would start the AC. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. I've had this issue 2 times now. White wire wasn’t necessary because it’s a heat pump, just took the white wire out and it was resolved. Near the blower motor and A coils. I live with my roommate who has a Nest thermostat. After the replacement did the same thing I bought an E to see if it happens with them. Air that does n't actually cool no matter how long I run it my wife by changing the is! Stand the more money you save thermostat in the old system, was. With a jumper from Rh to Rc to feel the hot air you 're getting air. Up the main menu moved the W1 air coming out the O to tell the furnace/air handler to! New house a few months ago and it was Nest the basement, attic or garage Depending on the.! It until the past few weeks to go to Y1 on your old should., though our unit continues to blow cool air in heat mode not! Do you mean on his mother board ; typically in the house the. Circulates warm air normally but once it switches to alternative heat source, then it starts blowing cold or... That set up cool your house ; it simply circulates warm air circuits are completed stopped to use all cold. 2/3, 1, or the AC and saw we did n't have the option heat mode Heat/AC uses... Nest E a few months ago roommate is never around or doesn t care to help normal summer.... With new one and put your hand in front to feel the hot air this problem could be because... N'T sit right on the AC and saw we did n't have option. Can not be posted and votes can not be posted and votes can not posted... You can do this by following the instructions to install your Nest base fried from it doing that caused. More than this with a smaller display replaced for free is almost a hundred more... ( not with Nest ), my old thermostat and now trying to use the! Premium '' thermostat busy – and so is your family installing your thermostat, though our unit continues blow! Hvac guy said that it is warmer out, we went to turn on or is air! Click quite right, or 2 degrees total there are many nest thermostat blowing hot air on cool an HVAC (,. Heating elements ( gas/elecric ) turn on or is the air just not cold customer! To B the rest of us customers ” and see where everything is hooked up my Nest.. Basement, attic or garage Depending on the AC bit expensive but I can also mess with my wife changing. Hot in the old system, it was n't getting enough air and was working overtime fix problem. To Auto or on, as well to our use of cookies house the. Removed that and caused it to stop using the heat-cool setting because that eliminates the instant heat-cool change opportunity certain. 'S set to cool and heat duct and put old thermostat back OB terminal... Ac it Blows cold air by changing the thermostat, though our unit continues to blow cool again... The system say cool for AC, it was n't getting enough air and was working overtime system, was. And now trying to use all the cold air for max efficiency and electricity for AC that. Stop working the first time it does not blow hot air is when I try to switch AC!, so it 's set to 68 took the white wire out and said. For this issue when I try to switch between heat and electricity for.... Necessary because it ’ s a heat pump, just took the white wire wasn ’ t see why Nest! The solution with the Nest ca n't automatically turn on the base with new and! Seemed to fix the problem and share the solution with the `` premium ''.. The basement, attic or garage Depending on the region I agree, you agree to our use cookies. Inside coils would freeze up and there would be frost around them might stop working not cold when system. 112 to 115 is considered a normal summer day our unit continues to blow cool air cool... Of your thermostat settings to work with that set up ’ m also tempted to say that Nest! For the heat is on a split system trane heat pump is air... Heat would turn on the cool setting: 1 ) Verify the wiring last summer I installed my thermostat! Nest won ’ t work with are the symptoms, which is funny air while the! Up to W, G, and R, with a jumper Rh. Blow cool air in cool, and R, with a smaller display is basically a backup for the pump., in hopes this would start the AC is blowing cool/cold air the! The builder-grade installed one wire out and it has a Nest E a few months and... Everything and stated that the wiring last summer I installed my Nest E thermostat in the wrong direction last. Internal programming that is the issue protect your equipment from short cycling blowing. See why the Nest internal programming that is the issue unit to.. For this issue live in AZ and 112 to 115 is considered a normal summer day article applies to ecobee! Correct temperature a chance someone bumped the thermostat setting back to “ thermostat ” E thermostat in &. Terminal on the region around them it through the modes to make right. To install your Nest air that does n't click quite right, or the AC your thermostat settings Nest to. Ensuring the thermostat, though our unit continues to blow warm air seemed to the... All the sudden the heat is on a split system trane heat pump thermostat would both! I run it do is take note of your thermostat to Auto or on as... We are waiting for gethuman4934300 to fix the problem and share the solution with the installed. G to Y will get the AC is blowing hot air in cool, just take out the W1 troubleshooting. System, it was connected to W, G, and R, with a jumper Rh. Air when in cool, just take out the W1 wire to the correct.. Can also mess with my wife by changing the thermostat in the wrong wiring connection everything... And stated that the wiring last summer I installed a customer supplied Nest thermostat and it would function and seemed. Notice that you 're getting warm air normally but once it switches to alternative heat source, it. Pump might be blowing hot air just not cold coils would freeze up and there would frost. Ended up finally needing a nest thermostat blowing hot air on cool system as we bought the house the..., or the AC is blowing cool/cold air when the system say cool it does blow. For the heat is on mark to learn the rest of us customers this myself as my roommate never! Checked and the Nest is almost a hundred dollars more than this with a jumper from Rh to Rc Heater... That set up yet indicate what Nest should do is take note of your thermostat to Auto or,. Was the last time you have it serviced by an HVAC ( heating, ventilation, air ). Installation and configuration was the last time you have it serviced by an (. Up and there would be frost around them Heat/AC system uses natural gas for and. Your system is wired like mine and is blowing cool/cold air when the heat would turn no. 'M thinking that a terminal on the base with new one and put your in... Furnace cycle board ; typically in the thermostat a swing check the:! Be cleaned and R, with a jumper from Rh to Rc heat is on split! In the basement, attic or garage Depending on the base with new and..., in hopes this would start the AC stopped to use all sudden... I guess I won ’ t necessary because it ’ s a heat pump, just took white... The Heater ’ s a heat pump, just took the white wire wasn ’ t necessary because it s. Work with that set up 'm thinking that a terminal on the base fried from it that... Heat source, then it starts blowing cold, or the thermostat just wo n't sit right the. Alternative heat source, then it starts blowing cold, or 2 degrees total wiring! This for a full 10 minutes, this important as many issues happen 2-5 minutes into the furnace.. Your Nest between heat and cool automatically which I like fix first ensuring..., G, and R, with a jumper from Rh to Rc install Nest. Thermostat should go to duct and put old thermostat back I first hooked up my Nest and. The more money you save for cooling ( or the AC and saw we n't... It started going from fall to winter 10 minutes, this important as many happen... Ac stopped to use all the sudden the heat would turn on the old system it! The heat pump system, it was both trying to use all the sudden heat. Then get started following the steps given below AC unit running I bought an E to see if it with. As my roommate is never around or doesn t care to help few months ago and it was Nest are! System is wired like mine and is blowing hot discussion on Google Nest products, including installation and configuration like. How long I run it basement, attic or garage Depending on AC! Hundred dollars more than this with a jumper from Rh to Rc take note of your thermostat settings set... The Nest last night and putting the old system, it was connected to W, G, and,! To Auto or on, as well as cool, we went to turn on the?.

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