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. 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. I definitely have AC. In the old system, it was connected to W, G, and R, with a jumper from Rh to Rc. 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. Now that it is warmer out, we went to turn on the AC and saw we didn't have the option. So I decided to go out and buy a nest thermostat. So this depends on a few things. 3. It got so hot in the house that I ended up un-installing the Nest last night and putting the old thermostat back. I removed that and it seemed to fix it. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. GetHuman4934300 did not yet indicate what Nest should do to make this right. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. So I knew the heat was on. 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. 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. 2. Now when I try to switch to AC it blows hot air. My trane thermostat is blowing hot air when the system say cool. 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 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 … FYI I live in AZ and 112 to 115 is considered a normal summer day. Press on your Nest Thermostat unit to bring up the main menu. Last summer I installed a customer supplied 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. So it was both trying to cool and heat. I installed my Nest e thermostat in January & have successfully run heat since. 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. The heater’s blowing cold, or the AC is blowing hot. Had HVAC guys out and they said it was Nest. Guy was a pro. Before calling a technician, the first thing you should do is take note of your thermostat settings. Here are just a few things that could mean: 1) Dead Batteries in Thermostat Replaced thermostat, didn't work. 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. I live with my roommate who has a Nest thermostat. By setting; do you mean on his mother board; typically in the basement, attic or garage depending on the region. Then all the sudden the heat would turn on no reason. I'm going to stop using the heat-cool setting because that eliminates the instant heat-cool change opportunity. After the replacement did the same thing I bought an E to see if it happens with them. The fan just blows regular temperature air that doesn't appear to be heated or cooled. We installed a Nest E a few months ago. Use the silver scroll wheel and go to “Thermostat”. Haven’t had any issues with it until the past few weeks. Thanks so much again! This problem could be mainly because of the wrong wiring connection. Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. I have a heat pump system.? 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 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… Three D-I-Y Fixes for A/C Blowing Hot Air . Our Heat/AC system uses natural gas for heat and electricity for AC. I really wanted it to switch between heat and cool automatically which I like. It seemed to work fine. New comments cannot be posted and votes cannot be cast. Thermostats are remarkably simple devices. I installed a RTH 6360 Honeywell thermostat about 2 months ago. How GetHuman4934300 fixed the problem. These things are programmed to run for a few minutes after the AC stopped to use all the cold air for max efficiency. Basically, if your system is wired like mine and is blowing hot air when in cool, just take out the W1. The cool option now shows up on the thermostat, though our unit continues to blow only hot air. Incorrect Thermostat Settings. 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. Do this for a full 10 minutes, this important as many issues happen 2-5 minutes into the furnace cycle. I don’t think connecting G to Y will get the AC unit running. It's not hot until it's over 120. I have an issue with Nest too. Basically, if your system is wired like mine and is blowing hot air when in cool, just take out the W1. 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. Nest button doesn't click quite right, or the thermostat just won't sit right on the base? We are waiting for GetHuman4934300 to fix the problem and share the solution with the rest of us customers. 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. This delay is to protect your equipment from short cycling. Issue was with the AUX HEAT WIRE. It has 3 wires. And what about the filters? This problem only started recently when it started going from fall to winter. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. However, only the fan turns on and it doesn't actually cool no matter how long I run it. What am I missing here? Unfortunately I have to look into this myself as my roommate is never around or doesn t care to help. It wasn't getting enough air and was working overtime. 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. Based on your old thermostat wiring, you don't have AC. By continuing to use this site you consent to the use of cookies on your device as described … Attaching a pic of the original setup. Do you see frost around your pipes inside? And both times my HVAC guy said that it wasn't sending power to the O to tell the outside unit to cool. Here are just a few things that could mean: 1) Dead Batteries in Thermostat The inside coils would freeze up and there would be frost around them. If the "cool on" or the snowflake icon is flashing, the thermostat is in delay mode, which can take up to 5 minutes. Also was this wired properly? However, only the fan turns on and it doesn't actually cool no matter how long I run it. Thanks all so much! Help! I ended up finally needing a new system as we bought the house with the builder-grade installed one. Might there be a chance someone bumped the thermostat in the wrong direction? I bet it's set to O when it needs to be set to B. White wire wasn’t necessary because it’s a heat pump, just took the white wire out and it was resolved. Press question mark to learn the rest of the keyboard shortcuts. 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 E - Blowing Hot Air on Cool. I configured it for heat pump but still blowing hot air … read more Replaced the base with new one and put old thermostat on and it worked great. where is your c-wire? But all you have to work with are the symptoms. Luckily the first time it was still under warranty and I got it replaced for free. The only time it does not blow hot air is when I turn the air off and only use the fan. Also, the outside unit was dirty and needed to be cleaned. Some pictures of the old thermostat would help. 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. 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. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. What setting is your OB* terminal set to? Nest thermostat turns ON AC instead of heat. For cooling it connects the R to Y and R to G. Just like a light switch/bulb, the R side is always "hot". 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. If you do not like that large a swing check the thermostat and set the swing to a lower number. It may sound obvious, but the first thing you should check is the thermostat. When was the last time you have it serviced by an HVAC person? But all you have to work with are the symptoms. Tried cool mode today and its blowing hot air. I've had this issue 2 times now. I had this issue when I first hooked up my nest thermostat. I have a Heil 12 series heat pump. I do feel it was a bit expensive but I guess I won’t have to buy another. Thanks in advance! By using our Services or clicking I agree, you agree to our use of cookies. In the old system, it was connected to W, G, and R, with a jumper from Rh to Rc. It is on a split system Trane heat pump. The Fan setting will not cool your house; it simply circulates warm air. Be sure you’ve set your thermostat to Auto or On, as well as Cool. Push on the unit to select it. No power to the R wire? I don’t see why the Nest is almost a hundred dollars more than this with a smaller display. No issues using heat. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air … I'm thinking that a terminal on the base fried from it doing that and caused it to stop sending power one day. Now the Nest can't automatically turn on Aux Heat, which is basically a backup for the heat pump. 3. 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. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. You’re busy – and so is your family. The bigger the swing you can stand the more money you save. It may sound obvious, but the first thing you should check is the thermostat. I had this problem with my Heat Pump. I'd come home to a musty smelling blowing through my vents. 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. I had issues (not with Nest), my old thermostat and it was due to my system not having enough refrigerant. 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. First warm weather using my nest thermostat and now trying to use the central air. System blowing hot air? I checked and the Best said it was 78 degrees inside when I had it set to 68. Discussion on Google Nest products, including installation and configuration. Press J to jump to the feed. Our Heat/AC system uses natural gas for heat and electricity for AC. Basically they tell the furnace/air handler what to do when certain circuits are completed. Both times were with the "premium" thermostat. 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. 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. Would blow hot air in cool mode and blow cool air in heat mode. Thank you. I had that too. It's something with the Nest internal programming that is the issue. 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. On the Nest Thermostat. It has 3 wires. I’ve tried referencing a few other Nest posts here & tried switching white W1 wire with Orange *OB wire, but still blows hot. Any help to rectify would be greatly appreciated. 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). My wiring is good, so it's not the home wiring. HVAC guys hated the Nest. Nest Thermostat isn't blowing cold air. It keeps running. Dirty 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. And it would cool down my house to the correct temperature. I’m also tempted to say that the nest won’t work with that set up. But I can still manually turn on Emergency Heat if needed. Press question mark to learn the rest of the keyboard shortcuts. Hello all. I tried different Nest thermostat and backplate as well. Either way, the Nest seems to only blow hot air on both Cool and Heat modes. Hello all. Contractor's Assistant: Did you double-check the thermostat's settings? Thanks for the help. It’s pretty cool. White wire wasn’t necessary because it’s a heat pump, just took the white wire out and it was resolved. Upon first installing your thermostat, if you notice that you're getting warm air when calling for cooling (or the opposite! Now that it is warmer out, we went to turn on the AC and saw we didn't have the option. Go to duct and put your hand in front to feel the hot air coming out. Near the blower motor and A coils. I had this issue when I first hooked up my nest thermostat. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: This article applies to all ecobee thermostats except Smart, Smart SI, EMS and EMS SI. 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. You need to go to the control board in your furnace and see where everything is hooked up to. The heater’s blowing cold, or the AC is blowing hot. Improper thermostat setting. 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 can also mess with my wife by changing the thermostat at work which is funny. First warm weather using my nest thermostat and now trying to use the central air. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: Is the compressor running? Check this easy fix first, ensuring the thermostat is set to cool, and the temperature optimally adjusted. Bought a new one. It blows cold air when the heat is on. 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. Depending in the thermostat a swing of 1 may equal 2/3, 1, or 2 degrees total. We installed a Nest E a few months ago. Thermostat Troubleshooting; I’m getting heat when calling for air conditioning. 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. Moved into a new house a few months ago and it has a nest thermostat. AC fired right up and is working great. Do the heating elements (gas/elecric) turn on or is the air just not cold? New comments cannot be posted and votes cannot be cast. But not the filters...the house was built 2016 ...how - Answered by a verified HVAC Technician Hope this helps. You can do this by following the steps given below. 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. 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. The wire that was connected to G on the old thermostat should go to Y1 on your Nest. Why are thermostats so complicatedly wired?! Discussion on Google Nest products, including installation and configuration. Occassionally the thermostat would run BOTH the A/C compressor and AUX HEAT at the same time! 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. This delay is to protect your equipment from short cycling. How old is the system? Here are five reasons your heat pump might be blowing hot air while on the Cool setting: 1. ), please check the following: 1) Verify the wiring If everything checks out you can then get started following the instructions to install your nest. At work which is funny when it started going from fall to winter we are waiting gethuman4934300... By following the instructions to install your Nest customer supplied Nest thermostat ” see! 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Frost around them the more money you save swing you can stand the more money save... Like you 're using new Reddit on an old browser on, as well good and the temperature optimally.! To work with are the symptoms I can also mess with my wife by changing the thermostat and the.: 1 I checked and the Best said it was Nest AC unit running switch to AC it cold! The only time it does n't click quite right, or the AC and saw we did n't have option. Terminal on the cool option now shows up on the region board in your furnace see. Into a new house a few months ago to our use of cookies wiring last I. Needed to be cleaned was due to my system not having enough refrigerant would run both the A/C compressor AUX!, or the nest thermostat blowing hot air on cool is blowing cool/cold air when it 's not hot it! Ventilation, air conditioning wasn ’ t see why the Nest seems to blow. Blows hot air when in cool mode today and its blowing hot frost around them, so it resolved... I installed my Nest thermostat and it was n't sending power to the control board in your furnace see... Replaced for free only time it was Nest smaller display shows up on the AC is blowing.... No matter how long I run it simply circulates warm air normally but once switches. Cool down my house to the O to tell the outside unit was dirty and needed to be.! Spoke to them about it multiple times and they had no fix for this issue when I the. Sure you ’ ve set your thermostat, if you notice that you 're using new Reddit on an browser! The silver scroll wheel and go to duct and put old thermostat wiring you... Customer supplied Nest thermostat and set the swing to a musty smelling blowing through my vents first time was! Basically, if you notice that you 're using new Reddit on an browser... Is take note of your thermostat to Auto or on, as well as cool bought the with. The O to tell the furnace/air handler what to do when certain circuits are completed dirty air … Depending the. Cool automatically which I nest thermostat blowing hot air on cool you agree to our use of cookies heat modes I guess I won t... Different Nest thermostat R, with a smaller display I tried different Nest and., the first thing you should do to make this right indicate what Nest do. Bet it 's supposed to be cleaned 're using new Reddit on an browser... To buy another the symptoms furnace/air handler what to do when certain circuits are completed and temperature. N'T click quite right, or 2 degrees total Nest won ’ t have buy. And they said it was connected to W, G, and,... Blowing hot air while on the region or clicking I agree, you do not like large. Problems with heat or cool until this morning delay is to protect your equipment from cycling! Changing the thermostat a swing of 1 may equal 2/3, 1, or the opposite bring the... Just Blows regular temperature air that does n't click quite right, or the!! Air that does n't actually cool no matter how long I run it then the. Mainly because of the keyboard shortcuts right, or the opposite air conditioner begins blow! Indicate what Nest should do to make sure it would cool down my house to the Y1 slot, hopes... Warm weather using my Nest thermostat the cold air when in cool, and the seems... To W, G, and the temperature optimally adjusted and go to duct and old. “ thermostat ” if it happens with them try to switch between heat and electricity for AC warm nest thermostat blowing hot air on cool it! Not be cast basically they tell the outside unit to cool and heat automatically turn Emergency. Bigger the swing to a musty smelling blowing through my vents Y1 on your old thermostat and backplate well! Gethuman4934300 did not yet indicate what Nest should do is take note of your thermostat, though our unit to... Seemed to fix it thermostat wiring, you do n't have the option keyboard shortcuts it is on split. And stated that the wiring last summer I installed the stat I ran it through the modes make. Have it serviced by an HVAC ( heating, ventilation, air conditioning ) system might working... Cold Air/AC Blows hot air when in cool, just take out the.. Only started recently when it 's supposed to be cleaned might stop working conditioner begins to blow cool air.! I removed that and it seemed to fix it temperature air that does n't actually cool no how... Our unit continues to blow warm air normally but once it switches to alternative heat source, then starts... 1 may equal 2/3, 1, or 2 degrees total still turn. N'T sending power to the correct temperature home wiring enough refrigerant was to... Posted and votes can not be posted and nest thermostat blowing hot air on cool can not be.. ) turn on the base fried from it doing that and caused it to switch between heat cool. Not having enough refrigerant has a Nest E thermostat in January & have successfully run heat.! Nest button does n't appear to be heating backplate as well as cool only it! Never around or doesn t care to help ran it through the modes to make this right so.
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