You can also replace damaged filters. After installing the Nest, during the heat pump test, my system blows warm air just fine. As weve mentioned, auxiliary heating is a separate mechanism from the heat pump. 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. Whats the indoor temperature? Put back your thermostat and test if your ac will start blowing cold air. Reversing valves are replaceable so a technician can advise if its necessary to have it replaced. On nest learning thermostat and thermostat e, under thermostat go to settings then select equipment and continue. These issues are difficult to catch early because the heat pump runs separately. I've attached photos of my old and new wiring. What's the best temperature setting for winter? If the unit connects to an auxiliary electric heater, it may also rely on the homes ductwork. Thankfully, this is an easy fix. Also, the white wire on the thermostat was connected to W2, but inside the air handler this wire goes to W1? I recently had to reset due to low battery & wifi issues. If your changeover engages, your orange wire is open and reason you are unable to bring on the heat. Possible Conclusion 3: Your Heat Pump Is in Defrost Mode. Ive read through the posts but not many resolutions , so would appreciate any help!! If the walls of your home are too cold and your heat pump is not powerful enough, AUX heat may be needed in order to make up the degrees. When it gets extremely cold outside, the amount of heat contained in the air diminishes. Then make a jumper between Y and G. The only downside with this method is that the fan wont work independently of heating or cooling. So if gas furnace it has failed. Though not often, you may occasionally run into situations where you think the aux heat function is ON. Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. What should I set my thermostat to in the winter? A substantial leak may divert the warm air elsewhere, perhaps outdoors, leaving you in the cold. Remember that you can change the aux heat setting so that auxiliary heating only when a set of conditions are met and not just one condition or the other. Check the label on your outside unit. In particular, is the aux heat section working well? I see the Yellow, Green, Brown, White, Red, and Blue wires are coming from the thermostat (it seems that orange and black are un-used). To change the orientation of a Nest thermostat, do this: Was Your Nest Thermostat Wiring for Heat Pump Done Correctly? 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. 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. This does not effect our editorial in any way. Proper and regular maintenance is vital because it helps you catch and address potential issues early. Using the Built-in Nest Thermostat Settings If you. Give auxiliary heat time to work its magic. I've also written out the connections on the old thermostat as the labels are hard to read behind the wiring. Otherwise, if its B is highlighted, select O and call for heat. You also need to check the wiring to make sure that everything is working currently. When extremely cold conditions are detected, the heat pump thermostat automatically requests help, and the supplemental heat source starts running automatically. For instance, if you have a malfunctioned thermostat, it may display aux ON even when auxiliary heating is not on. To make sure we provide the most qualified technician, please share more about your needs. 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. Reddit and its partners use cookies and similar technologies to provide you with a better experience. : Diagnose the thermostat. First of all, this happens when you don't wire it according to the heat pump row. If your thermostat is still not blowing cold, try selecting another orientation and test your thermostat again. Maybe theres a short circuit. Lets find out. Were you able to try Patrick's suggestion above? A continuously running unit will hike up your electricity bill and shorten the lifespan of your heat pump. Here is the old thermostat wiring: Original Thermostat Wiring, This wiring was copied to the Nest: Nest Wiring. The higher the current, the higher the heat output. Honeywell Thermostat Blowing Cold Air on Heat Setting [Fixed] Fix 3: Check the nest thermostat wiring. If theHeat Pump Balance doesn't appearin the app or your thermostats Nest Sense menu, you may have an incompatible system, or there could be a wiring issue that makes your thermostat think you have an incompatible system. So, let's see how you can fix it easily. try to move the black cable to W1 then it thinks that it's gas and not electric. To quickly tell the type of system you have follow these steps: When your nest thermostat is blowing cold air on heat or blowing hot air on cool setting the first thing you want to do is check the orientation OB settings of the thermostat. Although its not common, its also not unusual for auxiliary heat to misbehave or fail. While Nest manufacturer claims the thermostat is compatible with 95% of 24v volts systems. When youre away, we recommend lowering your thermostat by seven to 10 degrees. O/B and Y control your first stage heating for heat pump systems. Easy fix! Nest thermostat cold air blowing when heat setting is on The wiring from the original thermostat was copied to the Nest and the jumper was removed. Aux heat typically comes on in extremely cold winters when outdoor temperature dips below 40F. Ensure where your plumbing, ducting, and electrical wiring comes through the walls, floors, and ceilings is properly sealed. You need to check your thermostat wiring. Restart your Nest thermostat to see if it works or install a C-wire if it is underpowered and unable to heat. Let's figure out if it's a thermostat problem or a system problem. Why is my Heating not Working? - Honeywell Home The first thing you should consider is that perhaps the auxiliary heat source isn't ON. If you go to condenser and with the system set to heat, touch the orange and yellow wire together. Indeed, the majority, as weve said before, are electric heaters and gas heaters. A technician will be able to get this problem sorted out in no time. When the temperature inside your home drops three or more degrees below your set limit, your thermostat will kickstart the auxiliary heat. Should you have any new issues, updates or just a discussion topic, feel free to start a new thread in the community. Reason it blows opposite of what you're calling for is due to this manufacture energizes the HP changeover valve in Heating. Make sure to shut off the heat before you call the HVAC technician. You'll need to manually set the / OB connector as your second. Replace single-pane windows with more efficient double-pane windows. The same may happen if indoor temperatures are higher than the thermostat setting, but outdoor sensors call for aux heating. I am troubleshooting a nest thermostat that is blowing - JustAnswer Auxiliary heat should be a temporary setting and automatically turn off once your home warms up. I did follow that diagram. We provide quality connections between homeowners who need HVAC help and top-rated pros who get the job done. The option is greyed out. I put on the heat again and everything seems to be working fine now. An example of data being processed may be a unique identifier stored in a cookie. New install of Nest Learning Thermostat and we are getting cold air blowing. If your floors warm up to heat your home or you have radiators. If O is highlighted, select B and then try to call for heat. I changed it back to O and no heat. See if your unit is blocked by snow, ice, or fallen shrubbery. Auxiliary (AUX) heat is a second source of heat that comes with some heat pump systems. 1. Without an ignited burners, your home will never get heated up! 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. 11:27 AM 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. This can be in the form of a small aux light or a digital reading that says aux heat on your display. when I did that instead of heat coming on cold air was blowing through the system.the Google forums will not any help whatsoever. You can also replace damaged filters. Note: Use the Home app if you have a Nest Thermostat. If the system is a heat pump this should show. 05:50 PM. . To change the orientation of your thermostat, follow these steps: For most nest thermostats, you will need to go to your nest home app then tap on your thermostat. Heat Pump Balance controls AUX heat. There simply isnt enough heat in the outdoor air for your unit to absorb and carry into your home. You can change it from the Nest app or from your thermostat. If you are using a heat pump this should go into the OB/ terminal. A Nest thermostat with no C-wire connection will develop problems sooner or later. Making sure that your Nest thermostat doesnt switch to AUX heat is all about making the right settings. This fluctuating temperature provides both comfort and cost savings for your electricity bill. You need to be aware of what type of system you have and the type wiring that suits. Here are some wiring diagrams for heat pumps that could help you. The heat pump will automatically energize its auxiliary heat strip to help warm your home. If you have tried adjusting the orientation on your thermostat and your thermostat is still blowing hot air on cool, the problem could be with a changeover valve. The consent submitted will only be used for data processing originating from this website. To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. What does auxiliary heat mean? Nest 3rd Gen - Blowing Cold Air When Set to Heat Some background: The nest has been installed for a few weeks now, but since installation the heating has worked sporadically. Heat pumps are very effective compared to most other heating systems, but they take longer to heat your home the colder it gets outside. Or perhaps the thermostat battery is depleted. With the old thermostat, heat works normally (even in the 10-20F outdoor weather we are currently experiencing). Thanks! Just choose whether you want more comfort, more savings, or a balance between thetwo. Hi there, As most of the posts out there when my thermostat is set to blow hot air but it blows cold air. On your Nest thermostat, the O/B terminal controls the changeover valve. The best temperature to set your thermostat to in the winter is 68 degrees while youre at home. Take the Yellow, Green, and Red wires and connect them together (be sure to turn the system power off and back on). It will still work properly but you wont be able to use and configure the Heat Pump Balance feature. Nest Thermostat in heat mode, after 10 mins it blows cold air If it remains on, you may have a malfunction in your heat pump and need to call an HVAC service provider. Go to the home app and tap settings on the top right. If it isn't, you can useEarly-On, but your thermostat won't take specific measures to avoid expensive AUX heating. Setting the lockout temperature is important if you want to minimize the use of AUX heat. But when the winter weather drops to 40 degrees, that means your system will blow air that is about 95 degrees. Click heat pump and see which configuration is currently there. Not sure the wires are in the right spot, but not 100% sure. You need to find out for sure if you have a heat pump. Blows heat just fine, but when temp is reached out blows cold air for about 5 minutes! Its not changing from cold to hot. Backup heat sources must be connected to the W2, Aux, or E terminal for proper functionality.) If not, you may need to to a system reset. Auxiliary heat is a secondary heating function your thermostat automatically switches to when its too cold outside for your heat pump to extract warmth from the air. If the ductwork is compromised in any way, the delivery of warm air may be impeded. Only turn your heat up two degrees at a time. Is that air cold? Once I had the correct wiring I reset and went through setup again. See the two pins on it, that's where the plug goes to energize the valve. Look for any heat pump label. Manage Settings Scroll down until you find a heat pump. Then click on the thermostat and scroll down to the heat pump. The auxiliary heat source can be an electric resistance coil built into the heat pumps indoor air handler or a gas heater somewhere within the home. You also need to check the wiring to make sure that everything is working currently. Schedule an appointment with a local HVAC tech. As weve mentioned, auxiliary heating should come on automatically. Check to see if your thermostat is set to ON or AUTO. Auxiliary heat can be triggered if your home is three degrees lower than your set temperature. On heat up the current OB is usually highlighted. 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. Or, maybe, the wiring to the coils is compromised. Here is a pic of a generic solenoid, the black cylinder is the solenoid. 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. 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. Old Trane Thermostat Wiring To New Thermostat [Full Guide]. Thermostat Set to Heat but Blowing Cold Air | Honeywell Home Because your heat pump works as a heater and an air conditioner, it might work in the heater mode. Cookie Notice Currently, AH runs, blowing cold air while thermostat says heating. Caulk and weatherstrip doors and windows that may leak air. Make sure your aux heat indicator turns off when the outside temperature reaches 40 degrees or higher. Check every wiring and fix any loose or bent wire. How does auxiliary heat work? If there is a wire in the O/B terminal, then you probably have a heat pump. And if the O/B is connected, take it out and ensure that its straight and doesnt not have any corrosion. If not, try testing if either heating or cooling is working correctly. Is it working? 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? If it drops to 30 outside, your system will blow 85 degree air, which is much cooler than your skin temperature. The solution to this problem is to call an HVAC professional to come and take a look at it. When the heat pump is overwhelmed, the gas heater will switch on automatically and provide supplemental heat to keep you warm. Also ensure that the wire is exposed enough (1/3-/1/2 inch). Heat pumps look pretty much like air conditioners. Do not move the back wire to the W1 terminal. So, it is important that you start by checking if you have a heat pump or a conventional system before you start the troubleshooting. In particular, is the aux heat section working well? Your auxiliary heat turns on when your heat pump needs assistance reaching your set indoor temperature. This type of heating is often triggered when the outdoor temperature drops to near or below-freezing temperatures. Since electric heating is the most expensive form of heating, some auxiliary heat systems employ dual-fuel systems to provide supplemental heating. Heat pumps extract heat from the air outside the house and ump it inside the house to raise indoor temperatures. If cold air blows on heat and warm air blows on cool, then you have a heat pump. They transfer the warmth or coolness from one place to another. 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. If it gets colder outside than the set lockout temperature, your heat pump will use AUX heat. I could be wrong as I know nothing about hvac systems. Why does my Nest thermostat blow cold air on heat setting? Using Auxiliary Heat with a Nest Learning Thermostat - MROB However, for most heat pumps, auxiliary heating can only come on if indoor temperatures dip below 31F. Your air filter may also need to be cleaned or changed if it is clogged and unable to efficiently let air through. You can find more information about common heat pump malfunctions and steps to solve these issues here. If that doesnt solve the problem, your compressor contactor may be broken. May be something as simple as a switch or breaker is turned off. It happens sometimes. AUX heat can turn on when it's too cold outside, or your heat pump needs to defrost. What could be wrong? marcusmoreno23, I'm dropping by to check if how's your Nest Learning Thermostat now? 03-07-2022 02:16 PM. For instance, some Daikin models have a blinking light on the indoor air handler that only lights up when aux heat is ON. Otherwise, it may indicate that there is a wiring problem with your HVAC system or the Nest's C-wire. Weather this cold means your heat pump is rendered useless. - edited Your Google Nest thermostat can use Wi-Fi to check the outdoor weather conditions near your home. 4 Reasons Why Your Auxiliary Heat is ON But No Heat. If the auxiliary heat source is engaged, but theres no heat coming from it, then theres a problem. 11:35 AM. Have you ever noticed the phrase aux heat on your thermostat? 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. As a result, the air will actually feel cool against your skin. No matter which setting you choose, Heat Pump Balancedetermines how often expensive AUXheat is used. Ice can form when there is a problem with your heat strips, which work to keep your equipment defrosted. I went into the home app and went through the initial setup again.3. What Is the Newest Nest Thermostat Out Now? There are a few reasons your Nest thermostat could be blowing hot air on cool mode, and these include: Read also: Nest Thermostat Not Turning on AC Compressor [Solved]. 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. I had incorrectly labeled a jumper wire, causing the system to think I have a heat pump when in fact I dont. Photos of old and new wiring attached. Sometimes systems may need the C-wire to be installed to be compatible. Start by turning off power to your system, then pulling off the thermostat from the wall and inspecting the wiring. 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. Schedule an appointment with a heating expert to check my heat pump. Why is My Nest Thermostat Blowing Hot air on cool mode? Solution: Here, too, the first step is maintenance. Nest is blowing cool air while on heat. Gen 3 hewt punp heat The O/B is just reversed and can be fixed by setting it correctly. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. 04-24-2022 Use the G wire for the fan. If theres no wire in the O/B connector, your system is not configured as a heat pump. 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. It is in the correct location now. : Here, too, the first step is maintenance. Now you know theres no need for immediate panic. (~50s), but as it got colder (30s), the condenser has stopped trying to spin up. While there could be different reasons for your Nest thermostat not cooling and blowing hot air on cool mode, this guide provides the most common ones. Additionally, check any other signs on the heat pump designed to alert you when the heat pump is on. Because AUXheat is so expensive, running the heat pump longer can be cheaper than using AUX heat. After installing the Nest, during the heat pump test, my system blows warm air just fine. 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. If you have a fireplace, make sure the flue damper is tightly closed when it is not in use. Check the wire If you weren't able to resolve the issue with the. Nest Sense gives you plenty of control over your heating system. Thermostat shows auxiliary heat and blows cold air You can pull the cover off the tstat if you have a w2 and e terminal. Not sure if your heater is working properly? Check your equipment type under settings. When the fuel type is set to electric the blower will start immediately, and cold air will blow out until the heat exchanger warms up. You need to find out for sure if you have a heat pump. Since you dont have AUX heat,Heat Pump Balance won't appear as an option. Of course, the amount of heat generated also depends on the type of resistance wire. Another simple way to check whether you have a heat pump or not is to check your thermostat wiring. If your system supports high voltage (120-240volts) for thermostats, it wont work with your Nest thermostat. However, you cant feel the 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. The orientation settings on your nest thermostat switches between the heating and the cooling mode. Then, tap Heat Pump Balance. Incorrect thermostat settings is among the commonest reasons for thermostats to blow cool air on heat. If your unit and filter are free of debris, the problem could be low refrigerant levels. Thanks for reading. Auxiliary heat is a heating mechanism designed to fill the gap to keep you warm and cozy even when the heat pumps heating capacity diminishes. Labels: Heating Issues iOS As such, the effectiveness of the heat pump depends heavily on the amount of heat contained in the outside air. Bring up your Nest app. Most people prefer to use the Nest app to adjust the settings because it doesnt require getting off the couch. Nest thermostat blowing cold air in heat mode By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Thanks for reading. Airlucent.comis a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. . 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.