If your system supports high voltage (120-240volts) for thermostats, it wont work with your Nest thermostat. Heat pumps work both as air conditioners and heaters. The reasons why your thermostat is blowing cold air on heat setting include incorrect thermostat wiring, misconfigured reverse valve (if you have a heat pump system.) Put back your thermostat and test if your ac will start blowing cold air. Before doing anything ensure that you turn off the power to your HVAC system. Ive read through the posts but not many resolutions , so would appreciate any help!! Photos of old and new wiring attached. Although its not common, its also not unusual for auxiliary heat to misbehave or fail. We hope that, with the above troubleshooting tips given, you have managed to fix your nest thermostat blowing cold on heat setting. By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. The same applies to gas furnaces. If its a 2nd stage heat pump, wire it accordingly too. Installed new 3rd gen Nest, with yellow wire to Y1, green wire to G, Red wire to Rc, White wire to W. Nest thermostat comes on fine, fan blows for fan, fan blows for cool, fan blows for heat but no heat, its cool air. Ruud vs. Goodman: Which Air Conditioner is Better? I have also tried removing the Nest and re-installing the original thermostat and confirmed that the heat does still work with the old thermostat. At HVAC.com, our writers create solutions that put you in control of your HVAC system. If your thermostat is still not blowing cold, try selecting another orientation and test your thermostat again. You also need to check the wiring to make sure that everything is working currently. There are two main types of auxiliary heating solutions; The majority of heat pumps use electric resistance coils built into the mini split to provide auxiliary heat. I need assistance with my thermostat. Another trigger could be low refrigerant levels or a malfunction in your outdoor motor fans. temperature. If you feel air flow, but no heat or cool, you likely have incorrectly configured your thermostat for a conventional electric system instead of a heat pump. Sometimes, the Heat Pump Balance option may be missing in Nest Sense. Maybe you should confirm that the white wire is actually making good contact in the W2/Aux terminal. If you cant find your phone you can always make the same changes by using your thermostat. Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. Save my name, email, and website in this browser for the next time I comment. Honeywell Thermostat Blowing Cold Air on Heat Setting [Fixed], New Honeywell thermostat blowing hot air on cool, Amazon Smart Thermostat Wiring Diagram for Heat Pump [Full Guide], Carrier Infinity Thermostat Wiring To Nest or Honeywell, How to Remove Previous Owner From Nest Thermostat. Air Conditioner Repair Near Dallas: How to Find the Best Company? when I did that instead of heat coming on cold air was blowing through the system.the Google forums will not any help whatsoever. I am not having consistent heat with my nest. An indicator on your thermostat should alert you when your heating has switched to auxiliary heat. How does auxiliary heat work? That solved one problem and we uncovered that the heater was also short cycling. Not sure the wires are in the right spot, but not 100% sure. If it is cold enough where you are, the heat pump may not be warm enough without emergency heat. Anna Middleton If your heat and cool are reversed on your Nest, it could be that the orientation is not set correctly (for heat pumps only). Finally, bends can also constrict the ductwork, limiting the amount of warm air that passes through. 90% of all HP systems use O to energize in cooling not heating. A Nest thermostat will blow hot air on cool mode if you dont have a heat pump. I've used the diagrams here (http://support-assets.nest.com/images/pro-faq/Nest-Pro-Installer-Guide.pdf) with no luck. For instance, if you have a malfunctioned thermostat, it may display aux ON even when auxiliary heating is not on. Checking back in here if you still need help with your Nest thermostat. You also need to check the wiring to make sure that everything is working currently. Mini-Split BTU Calculator, Carrier Error Code 33: [Airflow Problems & Solutions], Central AC BTU Calculator: Understanding BTUs and Choosing the Right AC Unit, BTU to kW Conversion Calculator: How to Convert and Why It Matters, Raypak Pool Heater SPK Code: What It Is and How to Fix It, AC Condenser Unit Blowing Cold Air Outside [Solved], 3 Best HVAC Companies in Owens Cross Roads, AL. Your Nest thermostat could misbehave simply because its incompatible with your current HVAC system. 06:37 PM I went into the home app and went through the initial setup again.3. You can choose how much expensive AUX heat your system will use when your. Replace the batteries, reset your Nest, and then check to see how your heat is working. For instance, perhaps the electric resistance coils are damaged. Solution: Here, too, the first step is maintenance. A backup heating source is needed, however, for moments when the temperature suddenly drops. Not sure if your heater is working properly? Aux heat isn't ON. The most common issues you might experience from a Nest thermostat without a C wire include your thermostat getting too hot or too cold. . After installing the Nest Thermostat, my system seems to be having trouble calling for Auxiliary Heat. Keep your home at a steady temperature and your heat pump from putting in extra work by properly sealing your living space from the chilly air. Or, maybe, the wiring to the coils is compromised. You have a conventional system and not a heat pump. How do I change my primary heat source to gas? The heat pump will automatically energize its auxiliary heat strip to help warm your home. There simply isnt enough heat in the outdoor air for your unit to absorb and carry into your home. Make sure you have a heat pump system 2. Suppose youre using the Nest E thermostat or the learning thermostat, tap settings on your thermostat and select equipment. 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. If the filters are dirty, you can wash them or replace them. Some of our partners may process your data as a part of their legitimate business interest without asking for consent. It does this to prevent blowing cold air into your home while the outdoor condenser is thawing. Check your thermostat settings and clean your air filter. Also, the white wire on the thermostat was connected to W2, but inside the air handler this wire goes to W1? If your forced air system doesn't have a heat pump, your system will use. 04-24-2022 If your c-wire is missing, you can try out these 2 tips to sort out the problem: We hope this guide has helped you in one way or another. Your thermostat plays a big part in determining when auxiliary heat is activated. - edited A changeover valve that is defective or stuck in one position could be the reason your Nest thermostat is blowing warm air instead of cool. I called and spoke to someone but they were no help either. Your air filter may also need to be cleaned or changed if it is clogged and unable to efficiently let air through. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. Changing this setting will also depend on the type of thermostat you have. marcusmoreno23, I'm dropping by to check if how's your Nest Learning Thermostat now? If your system blows air through vents in your home, you have a forced air system, but you may not have a heat pump. These issues are difficult to catch early because the heat pump runs separately. The confusion can cause the unit to display aux ON without actually engaging auxiliary heating. Nest Thermostat blowing cold air - Google Nest Community Hi there, As most of the posts out there when my thermostat is set to blow hot air but it blows cold air. Then click on the thermostat and scroll down to the heat pump. Proper and regular maintenance is vital because it helps you catch and address potential issues early. Otherwise, it may indicate that there is a wiring problem with your HVAC system or the Nest's C-wire. : Theres only one solution here regular maintenance. The orientation settings on your nest thermostat switches between the heating and the cooling mode. Auxiliary heating functions on most heat pump systems to provide supplemental heat when the heat pump system is overstretched. Only turn your heat up two degrees at a time. October 10, 2021. Its not advisable to attempt DIY on auxiliary heat systems, especially gas heaters. Auxiliary heat will also turn on when your heat pump goes into defrost mode. Or two your change over valve is stuck and doesn't engage into heating. A changeover valve is a device in your heat pump that reverses the flow of the refrigerant so your heat pump can function as both a heater and an air conditioner. Discussion on Google Nest products, including installation and configuration. So, lets dive into details about why your nest thermostat is not cooling. If not, lets jump to the next step of our troubleshooting. Loose wires can negatively affect how your thermostat operates. To use Heat Pump Balance, your thermostat must also be connected to Wi-Fi. Drop the temperature to the lowest point and wait for a few minutes. This means that with the exception of unfortunate, unforeseen external interference, you can avoid using AUX heat to hit the target temperature all winter long. It could also be a malfunctioned fan. Pull off the G-wire and insert it onto the C terminal on the control board. New install of Nest Learning Thermostat and we are getting cold air blowing. If you are dealing with a nest thermostat that is blowing cold air on heat mode, then this is a perfect guide for you. Is it working? 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. AUX heat can also start if the pump cant handle the outside heat on cold winter nights. What Is the Newest Nest Thermostat Out Now? If it is set to ON, your fan will constantly blow out air, even when your furnace isn't heating it. First of all, this happens when you don't wire it according to the heat pump row. I recently had to reset due to low battery & wifi issues. Defrosting is another reason your heat pump might blow cold air through your vents. Samethe option is greyed out. Auxiliary heat should be a temporary setting and automatically turn off once your home warms up. Now try to feel the air that is coming out of your vents. if you have a heat pump system, you should expect to have a wire in the w2 or aux terminal. https://www.hvac.com/troubleshooting/what-temperature-thermostat-in-winter/. Ensure where your plumbing, ducting, and electrical wiring comes through the walls, floors, and ceilings is properly sealed. Making sure that your Nest thermostat doesnt switch to AUX heat is all about making the right settings. If both W1 and W2 connectors have wires it means that youre running a dual fuel system. Bring up your Nest app. Incorrect or loose wiring can cause the nest ac not to blow cold air. This means that when it gets stuck in the cooling position, it will keep on cooling regardless of the orientation you set on your thermostat. Your auxiliary heat turns on when your heat pump needs assistance reaching your set indoor temperature. 03-07-2022 And if the O/B is connected, take it out and ensure that its straight and doesnt not have any corrosion. How do you change the heat source? You could try connecting the black wire to the W1 terminal and see if that changes anything. TY :), 6585 Hwy 431 S.Suite 801 #249Owens Cross Roads, AL 35763. Changing orientations between heating and cooling depend on your heat pump model. By accepting all cookies, you agree to our use of cookies to deliver and maintain our services and site, improve the quality of Reddit, personalize Reddit content and advertising, and measure the effectiveness of advertising. Is the heat pump damaged? What's the best temperature setting for winter? Its a plug that plugs right on to the solenoid. Remember, your emergency heat is not automatic and will require you to physically turn it on and off. Just choose whether you want more comfort, more savings, or a balance between thetwo. If your heating system supports an AUX heat function then you have to make the appropriate configuration based on your personal needs and preferences. Change the O/B wire settings 4. I live in an apartment building that utilizes a heat pump and the building as informed me that the only source of heating is electrical. Heat pump heating or auxiliary heating does not work. Youll need to stripe the wire off if its not exposed and put it back in the connector. W2/AUX Heat Relay (Stage 2) / Auxiliary Heat Relay. 05:47 PM This will help avoid tripping your thermostats failsafe feature and starting your auxiliary heat cycle. Check how to install a Nest thermostat, Rc 24VAC power from the cooling transformer, W2/AUX Heat Relay (Stage 2) / Auxiliary Heat Relay. Additionally, check any other signs on the heat pump designed to alert you when the heat pump is on. Proper and regular maintenance is vital because it helps you catch and address potential issues early. When the emergency heat is turned on, the radiant heat strips in your system are ignited. If its a gas furnace, there could be an issue with the gas supply. Get an answer from an expert on the Google Home Help Forum. Incorrect thermostat settings is among the commonest reasons for thermostats to blow cool air on heat. I think it has to deal something with the change valve like the previous commenter said. If you are using a heat pump this should go into the OB/ terminal. Always make sure that the heat pump and auxiliary heating mechanisms are cleaned and maintained for optimal function. However, if the issue has already happened, your only option may be to switch off the heating system and call an HVAC technician. Understanding your unit will help you recognize when aux heat and emergency heat are necessary and when they may indicate a system malfunction. Disclaimer: Some pages on this site may include an affiliate link. This was because my old thermostat had 'conventional' and 'heat pump' labels on . Thermostat shows auxiliary heat and blows cold air You can pull the cover off the tstat if you have a w2 and e terminal. Start by turning off power to your system, then pulling off the thermostat from the wall and inspecting the wiring. The O/B is just reversed and can be fixed by setting it correctly. Remember that gas heaters, for example, are primarily ducted systems that rely on the homes main ductwork to deliver heat to different areas of the home. How To Fix a Facebook Account Temporarily Locked, How to Change the Location on a FireStick, How to Download Photos from Google Photos, How to Remove Netflix Recently Watched Shows, If no wire is present then you dont have AUX heat which means that the. Thanks for taking care of this,dhx227,RomanandsonAC, andPatrick_Caezza. Youll know that you have a heat pump by putting your thermostat on heat mode and if your outdoor unit kicks on. It does sound like the changeover valve is not getting signalled correctly. As weve mentioned, auxiliary heating is a separate mechanism from the heat pump. If the system is a heat pump this should show. I moved it back to B and still no heat. Tell us more and well help you get there. If not, try testing if either heating or cooling is working correctly. The same applies to gas furnaces. Discussion on Google Nest products, including installation and configuration. An example of data being processed may be a unique identifier stored in a cookie. Your Google Nest thermostat can use Wi-Fi to check the outdoor weather conditions near your home. It wont stop working because the electric resistance coils have blown or because the gas supply to the supplementary gas furnace is blocked. Manage Settings Seal air leaks around fireplaces, chimneys, furnaces, and water heaters with fire-resistant materials like sheet metal, sheetrock, or furnace cement caulk. http://support-assets.nest.com/images/pro-faq/Nest-Pro-Installer-Guide.pdf, The Nest Thermostat defaults to an O setting for heat. I've read through the posts but not many resolutions , so would appreciate any help!! Turn off your system power at the circuit breaker if you cant locate your system circuit breaker, trip the main breaker. Schedule an appointment with a heating expert to check my heat pump. See if your unit is blocked by snow, ice, or fallen shrubbery. If the problem doesnt go away after trying out these tips, perhaps call in local HVAC experts for help. Here is a option to validate the issue. In all likelihood, your heating system is working just as it should and needs a little extra power to get your home back to where youre most comfortable. Youll pull the wire from the G terminal and put it on the C terminal of your thermostat. However, if the problem has already happened, the only solution is to call an HVAC professional to diagnose and recommend a fix. If you go to condenser and with the system set to heat, touch the orange and yellow wire together. This type of heating is often triggered when the outdoor temperature drops to near or below-freezing temperatures. Weather this cold means your heat pump is rendered useless. - edited 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. Is it working appropriately? We and our partners use data for Personalised ads and content, ad and content measurement, audience insights and product development. Check if the O/B terminal is firmly connected. On the orientation configurations, if O is one that is highlighted, try changing it to B and vice versa. Check to see if your thermostat is set to ON or AUTO. 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. First off, dirty filters can constrict air passage into the duct system, meaning that very little warm air will come out into your rooms. Run a diagnostic test on your thermostat 3. Lets find out. Ice can form when there is a problem with your heat strips, which work to keep your equipment defrosted. Is it working? Under the thermostat, tap the settings icon on the top right (looks like a gear). AUXheat can cost about 2to 5times as much as running your heat pump. Generally, when a Nest thermostat is blowing cold on heat mode, this is something to do with orientation settings, a stuck reversing valve or loose wires in your thermostat wiring. Our product reviews and recommendations are researched and backed by real buyers and industry experts, not dictated by our partners. checked firmware and it says its current(6.2-22) What could be wrong? Nest thermostats are great devices, but sometimes problems can arise. If its higher than 40F, you dont need heating, and the aux ON display was probably a false alarm. How old is your system? Make sure your aux heat indicator turns off when the outside temperature reaches 40 degrees or higher. Below are some heat pump wiring diagrams to help you with your nest thermostat wiring. Were you able to try Patrick's suggestion above? Heat Pump Balance controls AUX heat. 2023 HVAC.com a Magenta Technologies LLC Company, All Rights Reserved, Frozen condensate drain: how to fix it yourself, https://www.hvac.com/troubleshooting/frozen-condensate-drain/, Should you cover roof vents in the winter? 11:35 AM. For example, if your AUX lockout temp is 40F or 4.4C, then AUXheat will come on when the outdoor temperature is below 40F or 4.4C. I'm looking for a picture to send you. 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. Whats the indoor temperature? However, to ensure that your thermostat has started working, you must test the cooling and heating again. I did a factory reset of the thermostat.2. It means that the auxiliary heater can malfunction without necessarily affecting the heat pump. If you have a fireplace, make sure the flue damper is tightly closed when it is not in use. The exact value varies from one heat pump to the next. Heat pumps work both as air conditioners and heaters. Your roof vents are an important tool to keep your attic mold-free. Of course, the amount of heat generated also depends on the type of resistance wire. Note that you can still set a lockout temperature by following the previously mentioned steps: Settings > Equipment > Heat Pump. Its a significantly more complex process. 2) Wait a few minutes and if cold air blows out of the vents. A Nest thermostat will blow hot air on cool mode if you don't have a heat pump. This can happen for many reasons. I have completed the set up steps several times but only warm/hot air is being pushed out. Nearly all heat pumps have a unique feature known as auxiliary heat, or aux heat, designed to supplement the heat pump when the going gets tough. It is in the correct location now. You need to check your thermostat wiring. If its an electric resistance coil heater, have an HVAC technician check and test it before the heating season begins. YourNest thermostat willadjust your lockout temperature based on how your heatpump is working. Most such systems are wired to a gas furnace. A continuously running unit will hike up your electricity bill and shorten the lifespan of your heat pump. But when the winter weather drops to 40 degrees, that means your system will blow air that is about 95 degrees. I've also written out the connections on the old thermostat as the labels are hard to read behind the wiring. Home maintenance needs change in the winter. Generally, when a Nest thermostat is blowing cold on heat mode, this is something to do with orientation settings, a stuck reversing valve or loose wires in your thermostat wiring. Labels: Heating Issues iOS However, if changing the orientation of the thermostat doesnt fix the problem. If O is highlighted, select B and then try to call for heat. If the filters are dirty, you can wash them or replace them. Add the orange wire to the bundle and it should blow the opposite of what it did without it. Once you do that, your fan should only blow out air that is heated by your furnace. In particular, is the aux heat section working well? Another way you can know if your system is a heat pump or not is by pulling off your Nest thermostat from the wall. Heat pumps look pretty much like air conditioners. Have you ever noticed the phrase aux heat on your thermostat? If theres no wire in the O/B connector, your system is not configured as a heat pump. Do not turn on emergency heat unless its actually an emergency. I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. This does not effect our editorial in any way. Go to the home app and tap settings on the top right. Reddit and its partners use cookies and similar technologies to provide you with a better experience. Tap Settings. Learn how to fix your frozen condensate drain. If O is already selected or highlighted, select B, and test your thermostat if it has started working correctly. However, fundamentally, thats what happens. when I did that instead of heat coming on cold ai. Nest thermostat blowing cold air in heat mode Cali2021 Community Member Options 12-26-2021 07:38 AM New install of Nest Learning Thermostat and we are getting cold air blowing. Heat Pump Balance lets you select a level of comfort andsavings that you like: more comfort, more savings, or a balance between the two. 1. Choose between Max Savings and Off. Check the label on your outside unit. Once I had the correct wiring I reset and went through setup again. try to move the black cable to W1 then it thinks that it's gas and not electric. 1. Click Continue, then select heat pump. Thanks! If Heat Pump Balance is enabled, you don't have to worry about setting the lockout No further effort is required on your part. Backup heat sources must be connected to the W2, Aux, or E terminal for proper functionality.) If you have a gas furnace the fuel type should be set to gas, which will delay start of the blower until the furnace warms up. Hi there, As most of the posts out there when my thermostat is set to blow hot air but it blows cold air. What should I set my thermostat to in the winter? Nest thermostat Heat Pump Balance settings are for systems that have a heat pump and auxiliary (AUX) heat. The only differences that I see are that: Nest thinks the heat pump O/B wire is orange when it is actually brown, Nest thinks the aux heat W2 wire is brown when it is actually white. Furnace Blowing Cold Air Because Of No Fire Your furnace not blowing hot air could be due to the ignition failing to start. Its best to have it checked before temperatures take another dive. Let look at the common reasons your nest could be cooling in heat mode. Currently, AH runs, blowing cold air while thermostat says heating. Also make sure the nest is set to not use auxiliary heat. Even though our original set up didnt have a C - wire, we had extra wires that my husband was able to use (thankfully) so we avoided a c wire adapter and also an expensive electrician trip. If you live in colder states with harsh winters, the outside temperature can mess with your heat pump. Read also: Honeywell Thermostat Blowing Cold Air on Heat Setting [Fixed]. The emergency heat setting on your heat pump should be used sparingly, typically when the thermostat temperature continues to drop after the heat pump has run for a long time. Nest Thermostat Not Cooling Even worse, it may start blowing hot air instead of cooling your room! If not, you may need to to a system reset. I installed a Nest thermostat and everything was working fine until I had to put the heat on in the winter. Emergency heat must be manually turned on. You can also replace damaged filters. A substantial leak may divert the warm air elsewhere, perhaps outdoors, leaving you in the cold. This can be in the form of a small aux light or a digital reading that says aux heat on your display. The nest is wired correctly, however you need to provision to energize in heating or B like your old tstat. Luckily, it can easily be replaced. 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). How much do you know about it? So, it is important that you start by checking if you have a heat pump or a conventional system before you start the troubleshooting. With the Nest wiring, we have no heat in the aux heating mode (which we need right now as it is too cold for the heat pump). If it isn't, you can useEarly-On, but your thermostat won't take specific measures to avoid expensive AUX heating. If you have a heat pump, you will not use a wire in the W terminal. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. As weve mentioned, auxiliary heating should come on automatically. If you have wires in both the W1 and W2 connectors of your Nest thermostat, your system is a dual fuel system, and wont use Heat Pump Balance. Test your heating and cooling again to make sure the issue is resolved. I have a cable connected to the Y (I dont have a clue of what that is for) but I am freezing and the aire wont blow warm.. Air is blowing cold on heat mode, does someone have a clue? Solution: Diagnose the thermostat. If your system has a heat pump, but there's no Heat Pump Balance setting in the app or on your thermostat, your thermostat may not be wired correctly. Setting the Nest for Emergency or Auxiliary Heat As mentioned at the start: If your heating system does not have a fan that blows air through vents, or if you get your heat from oil or gas, then these instructions do not apply to you. Setting the lockout temperature is important if you want to minimize the use of AUX heat. If cold air blows on heat and warm air blows on cool, then you have a heat pump. Did you ever get it figured out? One system may not need to use AUX heating often, while another system one may need to use AUX to keep the system heating even if the Max Savings setting is selected. To change the orientation of a Nest thermostat, do this: Was Your Nest Thermostat Wiring for Heat Pump Done Correctly?
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