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

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