I need assistance with my thermostat. How old is your system? Sometimes, the Heat Pump Balance option may be missing in Nest Sense. Heat pumps are the main source of heat most of the time, but they aren't effective when it's very cold outside. The * is set to E. I tested the emergency heat and that works fine. Put back your thermostat and test if your ac will start blowing cold air. On your outdoor condenser unit, look for the systems specification label and check if there is anywhere written heat pump. 11:35 AM. Why is my Heating not Working? - Honeywell Home It would be 24vac if the thermostat is calling for aux heat. 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. Here are some wiring diagrams for heat pumps that could help you. Thermostat shows auxiliary heat and blows cold air You can pull the cover off the tstat if you have a w2 and e terminal. Before doing anything ensure that you turn off the power to your HVAC system. Most such systems are wired to a gas furnace. But when the winter weather drops to 40 degrees, that means your system will blow air that is about 95 degrees. 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. To use Heat Pump Balance, your thermostat must also be connected to Wi-Fi. Scan this QR code to download the app now. It does sound like the changeover valve is not getting signalled correctly. Move the W wire to the W2 or Aux terminal. 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 you are dealing with a nest thermostat that is blowing cold air on heat mode, then this is a perfect guide for you. Not sure if your heater is working properly? 06:37 PM. Check if the O/B terminal is firmly connected. We hope that, with the above troubleshooting tips given, you have managed to fix your nest thermostat blowing cold on heat setting. Your thermostat is probably blowing the hot air because you use conventional heating (furnace). I've read through the posts but not many resolutions , so would appreciate any help!! I moved it back to B and still no heat. In mild climates, heat pumps are an energy-efficient way to heat and cool your home. 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. 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. : Theres only one solution here regular maintenance. Anna Middleton As weve mentioned, auxiliary heating is a separate mechanism from the heat pump. Put a jumper between w2 and e and put the tstat back together. If the temperature outside is 40 degrees or above, but your home wont stay warm if not in emergency heat mode, call your local HVAC expert. So, lets dive into details about why your nest thermostat is not cooling. If its higher than 40F, you dont need heating, and the aux ON display was probably a false alarm. How do I change my primary heat source to gas? 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. Air Conditioner Repair Near Dallas: How to Find the Best Company? 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. 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. If the problem doesnt go away after trying out these tips, perhaps call in local HVAC experts for help. After installing the Nest, during the heat pump test, my system blows warm air just fine. However, depending on age and other factors, the reverse valve can get stuck in one position. If it remains on, you may have a malfunction in your heat pump and need to call an HVAC service provider. 1. It is not uncommon for heat pumps heat and cool to be reversed. The same applies to gas furnaces. If I try to move the black cable to W1 then it thinks that its gas and not electric. Ruud vs. Goodman: Which Air Conditioner is Better? Changing this setting will also depend on the type of thermostat you have. I've used the diagrams here (http://support-assets.nest.com/images/pro-faq/Nest-Pro-Installer-Guide.pdf) with no luck. This will help avoid tripping your thermostats failsafe feature and starting your auxiliary heat cycle. Scan this QR code to download the app now. You can change it from the Nest app or from your thermostat. However, fundamentally, thats what happens. Drop the temperature to the lowest point and wait for a few minutes. Nest Thermostat in heat mode, after 10 mins it blows cold air Therefore, the heat pump may no longer supply enough heat inside the house. A Nest thermostat with no C-wire connection will develop problems sooner or later. Nest Thermostat Keeps Using Aux Heat - How To Fix - Alphr You can also identify dents, bends, and leaks in the ductwork early and address them before the heating season begins. When it gets extremely cold outside, the thermostat automatically switches on the resistance coils, which function just like any electric heater. You need to check your thermostat wiring. Choose between Max Savings and Off. 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. 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. 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. Well, I don't got much for you then. Check to see if your thermostat is set to ON or AUTO. Pull off your thermostats display. Note that you can still set a lockout temperature by following the previously mentioned steps: Settings > Equipment > Heat Pump. I recently had to reset due to low battery & wifi issues. 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. You can change Heat Pump Balance settings from the Nest Sense menu on your thermostat or with the Nest app. When the emergency heat is turned on, the radiant heat strips in your system are ignited. This is a perfect troubleshooting guide for you if you are dealing with a Nest thermostat that is not cooling and blowing hot air on cool mode. What does auxiliary heat mean? Solution: Theres only one solution here regular maintenance. Just choose whether you want more comfort, more savings, or a balance between thetwo. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. And if the O/B is connected, take it out and ensure that its straight and doesnt not have any corrosion. Its a significantly more complex process. It wont stop working because the electric resistance coils have blown or because the gas supply to the supplementary gas furnace is blocked. AStuf 4 yr. ago Alt heat means the heat pump is turned off and the other source (usually gas furnace) is asked to heat. The O/B terminal on your Nest thermostat is responsible for charging your changeover valve for cooling or heating. 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. Photos of old and new wiring attached. 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. Home maintenance needs change in the winter. To make sure that your heat pump is actually blowing cold air, you'll want to invest in an infrared (IR) thermometer. 1. If it drops to 30 outside, your system will blow 85 degree air, which is much cooler than your skin temperature. Manage Settings Ensure where your plumbing, ducting, and electrical wiring comes through the walls, floors, and ceilings is properly sealed. Or, maybe, the wiring to the coils is compromised. Currently, AH runs, blowing cold air while thermostat says heating. The consent submitted will only be used for data processing originating from this website. If your Nest has alerted you to low battery power, this might be why you're running out of heat. 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. Seal air leaks around fireplaces, chimneys, furnaces, and water heaters with fire-resistant materials like sheet metal, sheetrock, or furnace cement caulk. For instance, some Daikin models have a blinking light on the indoor air handler that only lights up when aux heat is ON. According to Energy Star, you can save up to 10% a year in heating costs by lowering your temperature to around 60 degrees during the night or when youre away. It could also be a malfunctioned fan. In particular, is the aux heat section working well? : Here, too, the first step is maintenance. However, to ensure that your thermostat has started working, you must test the cooling and heating again. Also ensure that the wire is exposed enough (1/3-/1/2 inch). This can happen for many reasons. If both W1 and W2 connectors have wires it means that youre running a dual fuel system. I installed a Nest thermostat and everything was working fine until I had to put the heat on in the winter. Heat Pump Balance lets you select a level of comfort andsavings that you like: more comfort, more savings, or a balance between the two. 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. 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. Make sure you have a heat pump system 2. If your heat and cool are reversed on your Nest, it could be that the orientation is not set correctly (for heat pumps only). If it is cold enough where you are, the heat pump may not be warm enough without emergency heat. Using Auxiliary Heat with a Nest Learning Thermostat - MROB Thanks for reading. I had incorrectly labeled a jumper wire. temperature. The option is greyed out. Alternatively, get the model number and any other necessary label information on your system and look it up on the internet. Read also: New Honeywell thermostat blowing hot air on cool. Re: Nest Thermostat blowing cold air - Google Nest Community This device reverses the direction of the refrigerant so that the heat pump can function as an air conditioner as well as a heater. Nest thermostat Heat Pump Balance settings are for systems that have a heat pump and auxiliary (AUX) heat. To make sure we provide the most qualified technician, please share more about your needs. You can change this option any time in the Nest Sense menu. Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. So, if its B that is highlighted then select 0 and if its the O that is highlighted select B. If this terminal is loosely connected or not connected, it will cause problems with your thermostat controlling heating and cooling for your heat pump. 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. Then, tap Heat Pump Balance. An example of data being processed may be a unique identifier stored in a cookie. Honeywell Thermostat Blowing Cold Air on Heat Setting [Fixed] 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. This can be in the form of a small aux light or a digital reading that says aux heat on your display. Caulk and weatherstrip doors and windows that may leak air. Click Continue, then select heat pump. 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? Maybe you're misled. Always make sure that the heat pump and auxiliary heating mechanisms are cleaned and maintained for optimal function. The confusion can cause the unit to display aux ON without actually engaging auxiliary heating. If your system starts to blow cool air when your Nest thermostat is in Heat mode (or if it blows warm air when its in Cool mode), change the settings for orientation of your heat pump. First of all, this happens when you don't wire it according to the heat pump row. 90% of all HP systems use O to energize in cooling not heating. Its your home air system. Indeed, the majority, as weve said before, are electric heaters and gas heaters. mrcool heat pump and nest thermostat : r/hvacadvice - Reddit 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. I installed a Nest thermostat and everything was working fine until I had to put the heat on in the winter. I went into the home app and went through the initial setup again.3. Furnace Blowing Cold Air Because Of No Fire Your furnace not blowing hot air could be due to the ignition failing to start. 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. You can also replace damaged filters. Nest thermostat blowing cold air in heat mode However, for most heat pumps, auxiliary heating can only come on if indoor temperatures dip below 31F. The O/B is just reversed and can be fixed by setting it correctly. Heat pumps look pretty much like air conditioners. If O is already selected or highlighted, select B, and test your thermostat if it has started working correctly. However, because the system is in cooling mode . 04-24-2022 : Diagnose the thermostat. Do not move the back wire to the W1 terminal. Important: Do not touch the wires in your thermostat while you check them. What Is the Newest Nest Thermostat Out Now? You do not have permission to remove this product association. 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. Start by removing the face of your thermostat and check if the OB wire is connected into the right terminal. You can use a low-expansion spray foam or install house flashing where you find issues.