Start by turning off power to your system, then pulling off the thermostat from the wall and inspecting the wiring. Solution: Theres only one solution here regular maintenance. Make sure to shut off the heat before you call the HVAC technician. A technician will be able to get this problem sorted out in no time. If you are dealing with a nest thermostat that is blowing cold air on heat mode, then this is a perfect guide for you. So, lets dive into details about why your nest thermostat is not cooling. If you are using a heat pump this should go into the OB/ terminal. You are correct! Heres what could be wrong; The first thing you should consider is that perhaps the auxiliary heat source isnt ON. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. Ensure where your plumbing, ducting, and electrical wiring comes through the walls, floors, and ceilings is properly sealed. Pull off the G-wire and insert it onto the C terminal on the control board. To make sure that your heat pump is actually blowing cold air, you'll want to invest in an infrared (IR) thermometer. You can also replace damaged filters. You can find more information about common heat pump malfunctions and steps to solve these issues here. If O is already selected or highlighted, select B, and test your thermostat if it has started working correctly. 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. Test your heating and cooling again to make sure the issue is resolved. Also ensure that the wire is exposed enough (1/3-/1/2 inch). AUX heat can also start if the pump cant handle the outside heat on cold winter nights. The higher the current, the higher the heat output. To understand what could go wrong with your auxiliary heat function, its important first to understand how aux heat works. When the temperature inside your home drops three or more degrees below your set limit, your thermostat will kickstart the auxiliary heat. Alternatively, get the model number and any other necessary label information on your system and look it up on the internet. Learn how to fix your frozen condensate drain. 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. This does not effect our editorial in any way. For more information, please see our 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. Check every wiring and fix any loose or bent wire. When I installed my Nest thermostat it was blowing hot air instead of cold. So, let's see how you can fix it easily. 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? Since you dont have AUX heat,Heat Pump Balance won't appear as an option. Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type. Heat Pump Balance controls AUX heat. Ruud vs. Goodman: Which Air Conditioner is Better? It is in the correct location now. Typically furnaces (air handlers) are installed indoors, and heat pumps (air conditioners) are located outside. 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. Furnace Blowing Cold Air Because Of No Fire Your furnace not blowing hot air could be due to the ignition failing to start. If you dont have a wire in the W2/AUX connector, you dont have AUX heat. 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. For instance, perhaps the electric resistance coils are damaged. Additionally, check any other signs on the heat pump designed to alert you when the heat pump is on. Keep an eye on your thermostat year-round for any warning signs of larger issues with your HVAC system. 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. Change the O/B wire settings 4. 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]. I had incorrectly labeled a jumper wire. Heat pumps extract heat from the air outside the house and ump it inside the house to raise indoor temperatures. Run a diagnostic test on your thermostat 3. If you go to condenser and with the system set to heat, touch the orange and yellow wire together. Always make sure that the heat pump and auxiliary heating mechanisms are cleaned and maintained for optimal function. It would be 24vac if the thermostat is calling for aux heat. No matter which setting you choose, Heat Pump Balancedetermines how often expensive AUXheat is used. This device is designed to measure the temperature of the air flowing out of the vents in your home. To make sure we provide the most qualified technician, please share more about your needs. As such, the effectiveness of the heat pump depends heavily on the amount of heat contained in the outside air. What should I set my thermostat to in the winter? If your system blows air through vents in your home, you have a forced air system, but you may not have a heat pump. Its likely at some point throughout the winter youll see aux heat on your thermostat. How much do you know about it? Remember that the display on the thermostat an LED system that can malfunction. Its not advisable to attempt DIY on auxiliary heat systems, especially gas heaters. Here is a option to validate the issue. This can happen for many reasons. Thankfully, this is an easy fix. 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. A changeover valve can become defective with the age of your system. Note: Normal programmable thermostats have one way to control AUXheat: the AUX lockout temperature. If it is cold enough where you are, the heat pump may not be warm enough without emergency heat. Check your equipment type under settings. Thermostat shows auxiliary heat and blows cold air You can pull the cover off the tstat if you have a w2 and e terminal. However, fundamentally, thats what happens. This type of system uses electricity and refrigerant to create a comfortable temperature within your home. Give auxiliary heat time to work its magic. 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. 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. Otherwise, if its B is highlighted, select O and call for heat. It could also be a malfunctioned fan. If your system supports high voltage (120-240volts) for thermostats, it wont work with your Nest thermostat. If your heating system supports an AUX heat function then you have to make the appropriate configuration based on your personal needs and preferences. Read also: New Honeywell thermostat blowing hot air on cool. You can change this option any time in the Nest Sense menu. There simply isnt enough heat in the outdoor air for your unit to absorb and carry into your home. Thanks for taking care of this,dhx227,RomanandsonAC, andPatrick_Caezza. Pros, cons & considerations, https://www.hvac.com/troubleshooting/should-you-cover-roof-vents-in-the-winter/. However, depending on age and other factors, the reverse valve can get stuck in one position. If the problem doesnt go away after trying out these tips, perhaps call in local HVAC experts for help. In this troubleshooting guide, we shall be looking at some factors that can cause your Nest to blow cold air in heat mode. You can also identify dents, bends, and leaks in the ductwork early and address them before the heating season begins. You do not have permission to remove this product association. 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 your thermostat is still not blowing cold, try selecting another orientation and test your thermostat again. 90% of all HP systems use O to energize in cooling not heating. 04-24-2022 03-07-2022 Auxiliary heat will also turn on when your heat pump goes into defrost mode. 04-24-2022 On the orientation configurations, if O is one that is highlighted, try changing it to B and vice versa. This type of heating is often triggered when the outdoor temperature drops to near or below-freezing temperatures. 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. With a heat pump system, the yellow wire turns it on or off, and the orange wire changes between it heating or cooling. Were you able to try Patrick's suggestion above? BUT, for the aux heat test, the air is not warm, and feels like room temp or slightly colder. 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. If the B option is highlighted, select O. It is not uncommon for heat pumps heat and cool to be reversed. One your thermostat wire(orange wire) is broken or open. Old Trane Thermostat Wiring To New Thermostat [Full Guide]. I had incorrectly labeled a jumper wire, causing the system to think I have a heat pump when in fact I dont. - edited Nest thermostat blowing cold air on heat. Home maintenance needs change in the winter. Amazon and the Amazon logo are trademarks of Amazon.com, Inc or its affiliates. Incorrect or loose wiring can cause the nest ac not to blow cold air. If the auxiliary heat source is engaged, but theres no heat coming from it, then theres a problem. 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. The best temperature to set your thermostat to in the winter is 68 degrees while youre at home. A substantial leak may divert the warm air elsewhere, perhaps outdoors, leaving you in the cold. 06:37 PM. Most people prefer to use the Nest app to adjust the settings because it doesnt require getting off the couch. Also make sure the nest is set to not use auxiliary heat. The most common issues you might experience from a Nest thermostat without a C wire include your thermostat getting too hot or too cold. Emergency heat requires a lot more energy and is more expensive. Heat pumps dont create heat or cold air by themselves. : Diagnose the thermostat. See if your unit is blocked by snow, ice, or fallen shrubbery. Photos of old and new wiring attached. Another trigger could be low refrigerant levels or a malfunction in your outdoor motor fans.

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