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