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

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