Because your heat pump works as a heater and an air conditioner, it might work in the heater mode. 03-07-2022 02:16 PM. Your air filter may also need to be cleaned or changed if it is clogged and unable to efficiently let air through. Pull off your thermostat display from the wall. Your roof vents are an important tool to keep your attic mold-free. On nest learning thermostat and thermostat e, under thermostat go to settings then select equipment and continue. Another simple way to check whether you have a heat pump or not is to check your thermostat wiring. I'm not an expert, though. It does this to prevent blowing cold air into your home while the outdoor condenser is thawing. Photos of old and new wiring attached. Aux heat isn't ON. If the ductwork is compromised in any way, the delivery of warm air may be impeded. If your thermostat is still not blowing cold, try selecting another orientation and test your thermostat again. 2) Incorrectly Configured Reverse valve. The O/B terminal on your Nest thermostat is responsible for charging your changeover valve for cooling or heating. Incorrect or loose wiring can cause the nest ac not to blow cold air. If it isn't, you can useEarly-On, but your thermostat won't take specific measures to avoid expensive AUX heating. Lets find out. Of course, the amount of heat generated also depends on the type of resistance wire. Restart your Nest thermostat to see if it works or install a C-wire if it is underpowered and unable to heat. To check whether the problem is with the Nest orientation settings or not do the following, 1)Put the thermostat on heat and raise the temperature a bit higher than the current room temperature. Sometimes, the Heat Pump Balance option may be missing in Nest Sense. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Also noticed, as im walking up the screen display goes to blue for cold air, but literally only for a milisecond, then to black background with normal white numbers; again with air still blowing for almost 5 min. If the unit connects to an auxiliary electric heater, it may also rely on the homes ductwork. Did you ever get it figured out? You can set a lockout temperature manually in the Equipment menu of your thermostat. if you have a heat pump system, you should expect to have a wire in the w2 or aux terminal. . It does this to prevent blowing cold air into your home while the outdoor condenser is thawing. This fluctuating temperature provides both comfort and cost savings for your electricity bill. It could also be a malfunctioned fan. https://www.hvac.com/troubleshooting/what-temperature-thermostat-in-winter/. Make sure to shut off the heat before you call the HVAC technician. 1. A Nest thermostat with no C-wire connection will develop problems sooner or later. You can use a low-expansion spray foam or install house flashing where you find issues. Nest is blowing cool air while on heat. Gen 3 hewt punp heat Connect me with a local heat pump repair person. On your Nest thermostat, the O/B terminal controls the changeover valve. The nest is wired correctly, however you need to provision to energize in heating or B like your old tstat. These issues are difficult to catch early because the heat pump runs separately. It is in the correct location now. Furnace Blowing Cold Air Because Of No Fire Your furnace not blowing hot air could be due to the ignition failing to start. For a 1st stage heat pump with AUX heat, the following are the terminals that must be connected for it to work properly: You can read more about Nest thermostat wiring for your specific heat pump here. The higher the current, the higher the heat output. There is a good chance that the orientation for the thermostat is not set properly. If you have a fireplace, make sure the flue damper is tightly closed when it is not in use. You have a conventional system and not a heat pump. A Nest thermostat will blow hot air on cool mode if you dont have a heat pump. Just choose whether you want more comfort, more savings, or a balance between thetwo. You need to find out for sure if you have a heat pump. Heat Pump Balance lets you select a level of comfort andsavings that you like: more comfort, more savings, or a balance between the two. Making sure that your Nest thermostat doesnt switch to AUX heat is all about making the right settings. Your Nest thermostat is not compatible with your cooling system. Just turn the fan setting from ON to AUTO. Inspect dirty spots in your insulation for air leaks and mold. (~50s), but as it got colder (30s), the condenser has stopped trying to spin up. Not sure if your heater is working properly? Your System Is Not Compatible with Your Nest Thermostat, Nest Thermostat Not Turning on AC Compressor [Solved], Google Nest Learning Thermostat Programmable Smart Thermostat for Home 3rd Generation Nest Thermostat Works with Alexa White, Google Nest Thermostat Smart Thermostat for Home Programmable Wifi Thermostat Snow, New Honeywell Thermostat Blowing Hot Air on Cool [Solved], What Size Mini-Split Do I Need? This does not effect our editorial in any way. I've attached photos of my old and new Google Nest Community Menu Blog Speakers and Displays Cameras and Doorbells Chromecast Thermostats Protect Wifi Apps / Account Nest Aware Give auxiliary heat time to work its magic. However, if the issue has already happened, the only option is to call an HVAC technician. When it gets extremely cold outside, the thermostat automatically switches on the resistance coils, which function just like any electric heater. The same applies to gas furnaces. 06:37 PM. Why Is Cold Air Blowing Out Of Vents When The Heat Is On? I've used the diagrams here (http://support-assets.nest.com/images/pro-faq/Nest-Pro-Installer-Guide.pdf) with no luck. Programmable smart thermostat that learns your schedule and the temperatures you like and programs itself to help you save energy and stay comfortable, Home/Away Assist automatically adjusts itself to an Eco Temperature after you leave so you dont heat or cool an empty home, Remote control lets family members change the temperature from anywhere on a phone laptop, or tablet[1], With Energy History just check your phone to see how much energy you used and why, or use Quick View on the thermostats display to reach Energy History, settings, or your schedule, Smart thermostat with HVAC monitoring which looks out for your heating and cooling systems; sends an alert if something doesnt seem right, along with helpful reminders to make maintenance easier[2], ENERGY STAR certified smart thermostat for home that helps you save energy and stay comfortable.Product note: You can also check your systems compatibility before purchasing a Nest thermostat with our online Nest Compatibility Checker on the Google Nest support page, The Nest Thermostat is designed to work without a C wire in most homes, but for some systems, including heating only, cooling only, zone controlled, and heat pump systems, youll need a C wire or other compatible power accessory. If you have a heat pump, you will not use a wire in the W terminal. First of all, this happens when you don't wire it according to the heat pump row. Setting the lockout temperature is important if you want to minimize the use of AUX heat. I've tried switching the heat pump from B to O. I have no experince in HVAC but I believe I have1 Stage Heat Pump with Aux heat and Emergency Heat. Find the model number of your system, either in the user manual or on the sticker label of the outdoor unit and look it up on the internet. You dont have to connect your Nest thermostat to your Wi-Fi network. Solution: Here, too, the first step is maintenance. This can be in the form of a small aux light or a digital reading that says aux heat on your display. However, because the system is in cooling mode . Thermostat Set to Heat but Blowing Cold Air | Honeywell Home If its higher than 40F, you dont need heating, and the aux ON display was probably a false alarm. You can also identify dents, bends, and leaks in the ductwork early and address them before the heating season begins. Proper and regular maintenance is vital because it helps you catch and address potential issues early. Here are some wiring diagrams for heat pumps that could help you. 05:47 PM Incorrect thermostat settings is among the commonest reasons for thermostats to blow cool air on heat. Is it working appropriately? See if your unit is blocked by snow, ice, or fallen shrubbery. Click Continue, then select heat pump. For a 1st stage heat pump, these are the terminals that are supposed to be connected. And if your O/B terminal isnt connected, you probably have a conventional system, not a heat pump. How do you change the heat source? Nest Thermostat Not Cooling (Blowing Hot Air on Cool) [Solved] Its typically needed in the winter season when the extremely cold conditions outside can cause the heat pump to underperform. Maybe youre misled. Although some auxiliary heaters are built into the heat pump, they have separate wiring and function differently. 12-27-2021 I'm looking for a picture to send you. In mild climates, heat pumps are an energy-efficient way to heat and cool your home. Solution: Diagnose the thermostat. Suppose youre using the Nest E thermostat or the learning thermostat, tap settings on your thermostat and select equipment. 05:50 PM. Finally, bends can also constrict the ductwork, limiting the amount of warm air that passes through. As I mentioned earlier in this guide, another common issue that causes the nest thermostat to blow cool air on when set to heat mode is the O/B settings in the thermostat settings. To change the orientation of a Nest thermostat, do this: Was Your Nest Thermostat Wiring for Heat Pump Done Correctly? Your system can use AUX heat to help keep you comfortable in harsh weather or to help change the temperature in your home quickly. Nest 3rd Gen - Blowing Cold Air When Set to Heat : r/Nest - Reddit Heat pump heating or auxiliary heating does not work. When those freezing temperatures occur, auxiliary heat makes its seasonal debut. 03-07-2022 Loose wires can negatively affect how your thermostat operates. Now, if you have tried changing the orientation settings from your app and that doesnt solve the issue, you might have a misplaced or corroded OB wire in your thermostat terminal. Auxiliary heat should be a temporary setting and automatically turn off once your home warms up. Move the W wire to the W2 or Aux terminal. Note: Normal programmable thermostats have one way to control AUXheat: the AUX lockout temperature. To make sure we provide the most qualified technician, please share more about your needs. Nest thermostat Heat Pump Balance settings are for systems that have a heat pump and auxiliary (AUX) heat. If it drops to 30 outside, your system will blow 85 degree air, which is much cooler than your skin temperature. TY :), 6585 Hwy 431 S.Suite 801 #249Owens Cross Roads, AL 35763. Heat pumps work both as air conditioners and heaters. Most such systems are wired to a gas furnace. Its likely at some point throughout the winter youll see aux heat on your thermostat. So, a significant portion of the heat that would have gone into the house ends up in the defrost process, further reducing the heat that gets into the house. To maintain your cost savings and keep your aux heat from turning on as you warm up your living space, we recommend increasing your thermostat by two-degree intervals. But when the winter weather drops to 40 degrees, that means your system will blow air that is about 95 degrees. Or two your change over valve is stuck and doesn't engage into heating. As most of the posts out there when my thermostat is set to blow hot air but it blows cold air. Common Problems With Nest Thermostat And How To Troubleshoot? Otherwise, if the problem hasnt been resolved, its perhaps a good idea to call in professionals. Backup heat sources must be connected to the W2, Aux, or E terminal for proper functionality.) Indeed, the majority, as weve said before, are electric heaters and gas heaters. Solution: The first thing you should do here is to check your thermostat. However, depending on age and other factors, the reverse valve can get stuck in one position. Reason it blows opposite of what you're calling for is due to this manufacture energizes the HP changeover valve in Heating. I cant change the Heat Fuel Source. We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Thermostat shows auxiliary heat and blows cold air Not sure the wires are in the right spot, but not 100% sure. The wiring from the original thermostat was copied to the Nest and the jumper was removed. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. Replace the batteries, reset your Nest, and then check to see how your heat is working. Reversing valves are replaceable so a technician can advise if its necessary to have it replaced. Your Nest thermostat could misbehave simply because its incompatible with your current HVAC system. If you touch the orange and yellow wire and nothing happens, your changeover valve is faulty, or disconnected. this time I put no heat pump.4. It happens sometimes. Its your home air system. Also, if you happen to have a voltmeter, then you could test whether the Nest is signaling Aux heat by testing the voltage of the white wire (and blue) at the heat pump. Defrosting is another reason your heat pump might blow cold air through your vents. Remember that the display on the thermostat an LED . A technician will be able to get this problem sorted out in no time. Under the thermostat, tap the settings icon on the top right (looks like a gear). Emergency heat is used to give the heat pump a break and avoid system damage (plus, it will warm your home in sub-freezing temperatures). Once I had the correct wiring I reset and went through setup again. - edited It would be 24vac if the thermostat is calling for aux heat. I installed a Nest thermostat and everything was working fine until I had to put the heat on in the winter. (W controls your first stage of heating for Gas/Oil/Electric systems. If you are using a heat pump this should go into the OB/ terminal. mrcool heat pump and nest thermostat : r/hvacadvice - Reddit Our product reviews and recommendations are researched and backed by real buyers and industry experts, not dictated by our partners. If you cant find your phone you can always make the same changes by using your thermostat. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. Since you dont have AUX heat,Heat Pump Balance won't appear as an option. Scheduled professional checkup, at least once per heating season, is especially crucial. 12-27-2021 In this article, well discuss the basics of using a Nest thermostat and what to expect. One your thermostat wire(orange wire) is broken or open. This heat pump thermostat setting means auxiliary heat is being used. You can find more information about common heat pump malfunctions and steps to solve these issues here. If theres no wire in the O/B connector, your system is not configured as a heat pump. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. A changeover valve can become defective with the age of your system. Auxiliary heating is dependent on a couple of factors, one of them being that indoor temperatures must be higher than a specific setting usually 40F. What's the best temperature setting for winter? To check if the O/B terminal is properly connected, follow these steps: A mistake in your thermostat wiring could be causing many thermostat issues. Continue with Recommended Cookies. Hi there, As most of the posts out there when my thermostat is set to blow hot air but it blows cold air. Most people prefer to use the Nest app to adjust the settings because it doesnt require getting off the couch. Thanks for reading. Additionally, check any other signs on the heat pump designed to alert you when the heat pump is on. Understanding your unit will help you recognize when aux heat and emergency heat are necessary and when they may indicate a system malfunction. . A heat pump warms your home by pulling in heat from the outdoors, but it can also cool your home by expelling heat from your living space to the outside. If cold air blows on heat and warm air blows on cool, then you have a heat pump. For instance, if you have a malfunctioned thermostat, it may display aux ON even when auxiliary heating is not on. That being said when you provision the Nest you have to change it to energize in heating, or switch from O to B. If the B option is highlighted, select O. Before doing anything ensure that you turn off the power to your HVAC system. Now you know theres no need for immediate panic. Why Is Your Auxiliary Heat ON But No Heat? - HouseholdAir Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. When I installed my Nest thermostat it was blowing hot air instead of cold. If I try to move the black cable to W1 then it thinks that its gas and not electric. Cookie Notice That solved one problem and we uncovered that the heater was also short cycling. You can also identify dents, bends, and leaks in the ductwork early and address them before the heating season begins. Both auxiliary and emergency heat should be temporary settings. Locate and tap the thermostat icon. When the weather outside gets colder than your lockout temperature, your thermostat will start using AUX heat. While you dont want this setting to be on all the time, it doesnt necessarily mean you need to call an HVAC expert and shell out a bunch of money. If you dont have a wire in the W2/AUX connector, you dont have AUX heat. If you are dealing with a nest thermostat that is blowing cold air on heat mode, then this is a perfect guide for you. Tell us more and well help you get there. Its best to have it checked before temperatures take another dive. I moved it back to B and still no heat. Pros, cons & considerations, https://www.hvac.com/troubleshooting/should-you-cover-roof-vents-in-the-winter/. Maybe youve even conformed on the thermostat that its ON. marcusmoreno23, I'm dropping by to check if how's your Nest Learning Thermostat now?