when the prompts ask me if I had a heat pump initially I had indicated yes but this was incorrect. Start by removing the face of your thermostat and check if the OB wire is connected into the right terminal. 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. However, if the issue has already happened, your only option may be to switch off the heating system and call an HVAC technician. First of all, this happens when you don't wire it according to the heat pump row. Home maintenance needs change in the winter. I am not having consistent heat with my nest. Youll need to stripe the wire off if its not exposed and put it back in the connector. As weve mentioned, auxiliary heating is a separate mechanism from the heat pump. Run a diagnostic test on your thermostat 3. Its not changing from cold to hot. Whats the indoor temperature? How old is your system? 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. Ensure that your thermostat wiring is done properly for your specific heat pump. I am not home right now to send a pic but I made sure to set it to B like it was on the old thermostat. An open Nest thermostat If your heat and cool are reversed on your Nest, it could be that the orientation is not set correctly (for heat pumps only). Check every wiring and fix any loose or bent wire. A Nest says it's heating but it's not if the flame sensor is dirty or damaged, and you'll need to replace it. The higher the current, the higher the heat output. There are a few DIY fixes that can save you some money, but most repairs should be handled by a professional heat pump repair technician. Auxiliary heat will kick on automatically when the outside temperature takes a sudden dip and your heat pump cant keep up with warming your space. 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. You can set a lockout temperature manually in the Equipment menu of your thermostat. If O is already selected or highlighted, select B, and test your thermostat if it has started working correctly. Make sure you have a heat pump system 2. When youre away, we recommend lowering your thermostat by seven to 10 degrees. Moreover, heat pumps defrost more often during extreme winter weather. Nest Says It's Heating But It's Not? (Possible Causes & Fixes) A Nest thermostat with no C-wire connection will develop problems sooner or later. The exact value varies from one heat pump to the next. I doubt you'd have any problems leaving the wire disconnected. checked firmware and it says its current(6.2-22) Thermostat shows auxiliary heat and blows cold air Is it working? Proper and regular maintenance is vital because it helps you catch and address potential issues early. TY :), 6585 Hwy 431 S.Suite 801 #249Owens Cross Roads, AL 35763. Currently, AH runs, blowing cold air while thermostat says heating. When the temperature inside your home drops three or more degrees below your set limit, your thermostat will kickstart the auxiliary heat. It could also be a malfunctioned fan. Change the O/B wire settings 4. https://www.hvac.com/troubleshooting/what-temperature-thermostat-in-winter/. If it remains on, you may have a malfunction in your heat pump and need to call an HVAC service provider. I am troubleshooting a nest thermostat that is blowing - JustAnswer Given that aux heat is also dependent on several other factors, sometimes the sensors can send a message to the thermostat requesting aux heat when indoor temperatures are still high enough. However, if the issue has already happened, the only option is to call an HVAC technician. You can use a low-expansion spray foam or install house flashing where you find issues. 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. A backup heating source is needed, however, for moments when the temperature suddenly drops. Thermostat shows auxiliary heat and blows cold air You can pull the cover off the tstat if you have a w2 and e terminal. Understanding your unit will help you recognize when aux heat and emergency heat are necessary and when they may indicate a system malfunction. 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. Finally, bends can also constrict the ductwork, limiting the amount of warm air that passes through. May be something as simple as a switch or breaker is turned off. If the heat pump ices over, AUX heat will kick in more often, in order to compensate and raise the temperature to the desired levels. Test your heating and cooling again to make sure the issue is resolved. In particular, is the aux heat section working well? Aux heat isn't ON. Im having the same problem. I cant change the Heat Fuel Source. Nest Thermostat Not Cooling (Blowing Hot Air on Cool) [Solved] If the filters are dirty, you can wash them or replace them. What should I set my thermostat to in the winter? 1. Save my name, email, and website in this browser for the next time I comment. It may cause your furnace to stop running when the weather is chilly! Why Is Cold Air Blowing Out Of Vents When The Heat Is On? 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. Run this function only when the temperature inside your home takes an extreme drop and turn it off when the temperature is within 3 degrees of your desired setting. Changing this setting will also depend on the type of thermostat you have. The option is greyed out. While Nest manufacturer claims the thermostat is compatible with 95% of 24v volts systems. 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. Airflow in the ducts can be compromised for several reasons. There are four settings for you to choose from, but only two of them are designed to truly maximize energy efficiency and use less AUX heat. Seal air leaks around fireplaces, chimneys, furnaces, and water heaters with fire-resistant materials like sheet metal, sheetrock, or furnace cement caulk. Why Is My Heat Pump Blowing Cold Air? Diagnose the Problem - H2ouse When temperatures outdoors drop below a critical balance point, the thermostat sends a signal for the secondary heat source to come on. 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. Aux Heat Blowing Cold w/ Nest - Old Thermostat Works Fine After installing the Nest Thermostat, my system seems to be having trouble calling for Auxiliary Heat. With a heat pump system, the yellow wire turns it on or off, and the orange wire changes between it heating or cooling. Or maybe its a problem with the auxiliary heating strips? 03-07-2022 02:16 PM. Note that you can still set a lockout temperature by following the previously mentioned steps: Settings > Equipment > Heat Pump. If your thermostat is still not blowing cold, try selecting another orientation and test your thermostat again. You must have a Rheem or Ruud System. Anna Middleton By rejecting non-essential cookies, Reddit may still use certain cookies to ensure the proper functionality of our platform. Move the W wire to the W2 or Aux terminal. You might be surprised! Solution: Diagnose the thermostat. For a 1st stage heat pump, these are the terminals that are supposed to be connected. 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. Have you ever noticed the phrase aux heat on your thermostat? Note: Use the Home app if you have a Nest Thermostat. 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. So if gas furnace it has failed. Nest Thermostat in heat mode, after 10 mins it blows cold air I did follow that diagram. Hi, I am troubleshooting a nest thermostat that is blowing cool/cold air when it's supposed to be heating. Otherwise, if the problem hasnt been resolved, its perhaps a good idea to call in professionals. Also, the white wire on the thermostat was connected to W2, but inside the air handler this wire goes to W1? Did you ever get it figured out? I went into the home app and went through the initial setup again.3. Then youll need to go down to your furnaces control board. Click heat pump and see which configuration is currently there. Solution: Theres only one solution here regular maintenance. Nest Thermostat blowing cold air - Google Nest Community If its an electric resistance coil heater, have an HVAC technician check and test it before the heating season begins. So, let's see how you can fix it easily. I called and spoke to someone but they were no help either. Weather this cold means your heat pump is rendered useless. when I did that instead of heat coming on cold ai. I've used the diagrams here (http://support-assets.nest.com/images/pro-faq/Nest-Pro-Installer-Guide.pdf) with no luck. Is it working? Although some auxiliary heaters are built into the heat pump, they have separate wiring and function differently. Check your thermostat settings and clean your air filter. 11:35 AM. Remember, your emergency heat is not automatic and will require you to physically turn it on and off. Still need help? If I try to move the black cable to W1 then it thinks that its gas and not electric. If it is than you either have one of tow issues. You can also identify dents, bends, and leaks in the ductwork early and address them before the heating season begins. Your Google Nest thermostat can use Wi-Fi to check the outdoor weather conditions near your home. 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.. Checking back in here if you still need help with your Nest thermostat. You can also replace damaged filters. Reason it blows opposite of what you're calling for is due to this manufacture energizes the HP changeover valve in Heating. I moved it back to B and still no heat. The same may happen if indoor temperatures are higher than the thermostat setting, but outdoor sensors call for aux heating. I had incorrectly labeled a jumper wire. The wires used for heating are high-resistance wires that produce heat when current is forced through them. Caulk and weatherstrip doors and windows that may leak air. Most people prefer to use the Nest app to adjust the settings because it doesnt require getting off the couch. You can purchase these devices at most home improvement stores. Remember that the display on the thermostat an LED . Nest Thermostat Keeps Using Aux Heat - How To Fix - Alphr Do not turn on emergency heat unless its actually an emergency. Why is My Nest Thermostat Blowing Hot air on cool mode? Model GMS80704BXCC. Heat pumps are very effective compared to most other heating systems, but they take longer to heat your home the colder it gets outside. However, you cant feel the heat. Thanks! The same applies to gas furnaces. Maybe you should confirm that the white wire is actually making good contact in the W2/Aux terminal. We and our partners use cookies to Store and/or access information on a device. If its an electric resistance coil heater, have an HVAC technician check and test it before the heating season begins. Nest thermostat Heat Pump Balance settings are for systems that have a heat pump and auxiliary (AUX) heat. The best temperature to set your thermostat to in the winter is 68 degrees while youre at home. Replace the batteries, reset your Nest, and then check to see how your heat is working. Go to the home app and tap settings on the top right. : The first thing you should do here is to check your thermostat. If that works perfectly for heating, then try testing if cooling is working too by doing this: If your Nest thermostat is blowing warm air instead of cool, try changing the orientation of your thermostat. I have completed the set up steps several times but only warm/hot air is being pushed out. Schedule an appointment with a heating expert to check my heat pump. To use Heat Pump Balance, your thermostat must also be connected to Wi-Fi. It does sound like the changeover valve is not getting signalled correctly. Aux Heat Blowing Cold w/ Nest - Old Thermostat Works Fine : r/Nest - Reddit BUT, for the aux heat test, the air is not warm, and feels like room temp or slightly colder. 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. Maybe youve even conformed on the thermostat that its ON. Keep in mind that its not uncommon for the AUX hit to automatically switch on even when the pump is providing enough heat. Of course, the amount of heat generated also depends on the type of resistance wire. Bring up your Nest app. 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. this time I put no heat pump.4. A Nest thermostat will blow hot air on cool mode if you dont have a heat pump. When your heat pump goes into defrost mode, it switches into cooling mode, causing the outdoor coils to heat up to melt any frost or ice within the system. AUX heat can turn on when it's too cold outside, or your heat pump needs to defrost. Disclaimer: Some pages on this site may include an affiliate link. Since electric heating is the most expensive form of heating, some auxiliary heat systems employ dual-fuel systems to provide supplemental heating. Make sure your aux heat indicator turns off when the outside temperature reaches 40 degrees or higher. Nest Thermostat Not Cooling Even worse, it may start blowing hot air instead of cooling your room! 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. 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.) Your system can use AUX heat to help keep you comfortable in harsh weather or to help change the temperature in your home quickly. Auxiliary heat can be triggered if your home is three degrees lower than your set temperature. 90% of all HP systems use O to energize in cooling not heating. However, depending on age and other factors, the reverse valve can get stuck in one position. You have a conventional system and not a heat pump. If thats the case, you may need to recheck the thermostat wiring. 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. If O is highlighted, select B and then try to call for heat. It is not uncommon for heat pumps heat and cool to be reversed. Double check your wires and restart the setup. 2) Wait a few minutes and if cold air blows out of the vents. Read more 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 However, if the problem has already happened, the only solution is to call an HVAC professional to diagnose and recommend a fix. 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. You also need to check the wiring to make sure that everything is working currently. It will still work properly but you wont be able to use and configure the Heat Pump Balance feature. What Is the Newest Nest Thermostat Out Now? Old Trane Thermostat Wiring To New Thermostat [Full Guide]. After a few days of frustration and trying different Nest settings, I decided to open up the air handler and confirm the connections inside are correct. 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. The O/B terminal on your Nest thermostat is responsible for charging your changeover valve for cooling or heating. Check back in 30 minutes or so to see if it has turned off on its own. Using Auxiliary Heat with a Nest Learning Thermostat - MROB 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. You need to check your thermostat wiring. Nest 3rd Gen - Blowing Cold Air When Set to Heat : r/Nest - Reddit For instance, if you have a malfunctioned thermostat, it may display aux ON even when auxiliary heating is not on. 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. Furnace Blowing Cold Air Because Of No Fire Your furnace not blowing hot air could be due to the ignition failing to start. Your heat pump will defer to aux heat on its own when the temperature is too cold outside for the unit to warm your home to the desired temperature. After installing the Nest Thermostat, my system seems to be having trouble calling for Auxiliary Heat. Here is the old thermostat wiring: Original Thermostat Wiring, This wiring was copied to the Nest: Nest Wiring. If your unit and filter are free of debris, the problem could be low refrigerant levels. Thanks for taking care of this,dhx227,RomanandsonAC, andPatrick_Caezza. I put on the heat again and everything seems to be working fine now. I could be wrong as I know nothing about hvac systems. Let look at the common reasons your nest could be cooling in heat mode. On your Nest thermostat, the O/B terminal controls the changeover valve. I think it has to deal something with the change valve like the previous commenter said. New install of Nest Learning Thermostat and we are getting cold air blowing. We provide quality connections between homeowners who need HVAC help and top-rated pros who get the job done. For instance, some Daikin models have a blinking light on the indoor air handler that only lights up when aux heat is ON. Discussion on Google Nest products, including installation and configuration. If your floors warm up to heat your home or you have radiators. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. If it isn't, you can useEarly-On, but your thermostat won't take specific measures to avoid expensive AUX heating. Inspect dirty spots in your insulation for air leaks and mold. Auxiliary heat will also turn on when your heat pump goes into defrost mode. Heat Pump Balance - Google Nest Help If it is set to ON, your fan will constantly blow out air, even when your furnace isn't heating it. Finally, you may also not be getting heat because the airways designed to deliver auxiliary heat to your home have failed. If the B option is highlighted, select O. Pull off your thermostat display from the wall. If the O option is highlighted, select B. If the unit connects to an auxiliary electric heater, it may also rely on the homes ductwork. They transfer the warmth or coolness from one place to another. Nest thermostat blowing cold air on heat. 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. Ensure also that the end of the wire connecting to the O/B terminal is stripped enough to have proper contact with the terminal. I haven't heard from you in a while so I'll be locking this thread if there is no update within the day. Put a jumper between w2 and e and put the tstat back together. 2) Incorrectly Configured Reverse valve. 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. If your heat and cool are reversed on your Nest, it could be that the orientation is not set correctly (for heat pumps only). Now try to feel the air that is coming out of your vents. Proper and regular maintenance is vital because it helps you catch and address potential issues early. 1. Lets find out. 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. You need to find out for sure if you have a heat pump. It wont stop working because the electric resistance coils have blown or because the gas supply to the supplementary gas furnace is blocked. 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