nest aux heat blowing cold air

Check that all connectors that have wires are down (see picture). Thermostat. 00:00. One of the most common reasons that your heating system is blowing out cold air is due to your thermostat. Looks like that is for the AUX heating, which was working with the old thermostat when I ran through the settings with it yesterday to make sure everything was still working. Take a moment to listen to your heat pump. If you have a central HVAC (heating / ventilation / air conditioning) system called a "heat pump", and live in an area where the temperature in the winter goes below about 50F (or 10C) then you probably have something called "emergency heat" or "auxiliary heat". Without the heating, the blower will just blow out cold air. 3 yr. ago Nest Thermostat Generation 3 Alt heat means the heat pump is turned off and the other source (usually gas furnace) is asked to heat. As fan blows air across that hot coil it becomes warm air.It seems the compressor is indeed running if the tubing is HOT at the outdoor unit. How to fix the frost issue. Why is my Nest thermostat blowing cold air? For example, if your AUX lockout temp is 40F or 4.4C, then AUX heat will come on when the outdoor temperature drops below 40F or 4.4C. Or when someone decides they are cold, and turns the thermostat up more than three degrees. Here are just a few things that could mean: 1) Dead Batteries in Thermostat Seems silly, but you'd be surprised how often this has happened. Aux on the thermostat stands for auxiliary heat. If the fan does not turn on, stop the test immediately. Generally speaking, a heat pump will produce air that is about 55 degrees warmer than the outside air. Emergency Heat. If your fan is running all day, it eventually starts to feel like cold air is blowing, whether or not you have the heat on. Select Heat Pump Balance then choose the setting you want. Check the electrical panel and switch the heat pump breaker to "on" if necessary. . 03:06. If you're not sure you have a heat pump, start with step 1. If needed, re-insert wires so that the connector button stays fully pressed down. Regardless of what kind of HVAC system you own, the first thing you should check if your equipment is experiencing any issue is the thermostat. Adjusting the Nest Thermostat using the App Settings Most people prefer to use the Nest app to adjust the settings because it doesn't require getting off the couch. For some homeowners, the "AUX" heating source will be electrical resistance heating, which consists of large wire heating . Make sure the heatpump is actually heating -> the air coming out should of the outdoor unit should be cold, and the large insulated pipe very hot. To check it, just locate the pilot and see if it won't light or if it won't stay lit. Is AUX heat normal? Turn off power to your system at the fuse box or system switch. The fan should kick in along with the heat coils. . You're standing there pushing buttons trying to heat up the house, but it's just not working. . Answered in 22 minutes by: 4/15/2018. Pull off the Nest thermostat display. Vocational, Technical or Trade Scho. Nest Thermostat Blowing Hot Air on Cool [Solved] AC Unit Blowing Hot Air Outside [Solved . Emergency Heat. 1. Why is my nest blowing cold air instead of heat? 3. Your thermostat is calling for a high temperature increase (2-4F) The heat pump is in defrost mode. And because the heat pump switched to cooling mode, it will blow cold air into your home for a few minutes. The heat pump starts pumping hot refrigerant from the outdoor coil through the copper tubing and through indoor coil. Also Know, is it normal for . Because your heat pump works both as a heater and an air conditioner, it might be working in the heater mode. 2. but the heater does not heat. You may have noticed a loud sound right before cold air blows out through the vents in your home. wiring hvac thermostat nest. Frost on the outside coil is condensation that forms up on the coil in the form of frost. If your Nest thermostat is blowing warm air instead of cool, try changing the orientation of your thermostat. 4) Auxiliary heat is malfunctioning. . Any help is appreciated. 1 yr. ago Just for info, heat pump heat IS lukewarm. Check to see if your thermostat is set to ON or AUTO. From here, you have the option to set the fan to "Auto" or "On" in both heat and cool mode. Pull off the Nest thermostat display. If you have ruled out number 1 and number 2 on the list, the next thing you want to consider is checking to see if you have a thermostat problem. Auxiliary heat is a component of heat pump systems. Heating and air conditioning has been my specialty for 46 years , so not much I can't solve if given the opportunity. Auxiliary heat/ Emergency heat help the heat pump keep up when cold outside or the temperature differential on the thermostat is large. Heat transfer is the most efficient (and cheapest) type of heating, and it's your heat pump's main solution for heating your home. Is there some reason you aren't telling us what furnace or heat pump the Nest is connected to . So if gas furnace it has failed. Go to Main Menu > Comfort Settings. ; Press Next. Make sure you have a heat pump system 2. Check your thermostat. Heat blowing cold air. Sensi Smart Thermostat. When a heat pump begins the defrost cycle, the outdoor fan shuts off and . If needed, re-insert wires so that the connector button stays fully pressed down. Select Settings . I have a nest learning thermostat. Assuming that W / AUX is for the auxiliary heat, is it worth turning the nest to heat cycle and turn up . If your fan is set to "ON," it will continuously run, even when the heater itself is not running. The sound you hear is the reversing valve switching your unit over to cooling mode. 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. As a result, the heat pump will blow out hot air instead of cool air. The heat usually works fine. May be something as simple as a switch or breaker is turned off. Before we get more into when your heat pump should run in AUX heat . Otherwise, it may indicate that there is a wiring problem with your HVAC system or the Nest's C-wire. In 2008 I had the same issue, that in the Aux. 6. This will help prevent damage to your system and help keep you safe. 31 1 1 gold badge 1 1 silver badge 5 5 bronze badges. This is when the outside is around 35-40 degrees and the indoor temperature is around three degrees cooler than the thermostat setting. Can someone help me? 1. . . Therefore, if it's below 40 outside and the auxiliary heat isn't working, then your heat pump will just blow lukewarm or cool air. This might seem like a no-brainer, but sometimes we accidentally set our thermostats incorrectly, resulting in the heater blowing cold air. This test will make Nest think the aux heat is a/c. Just turn the fan setting from ON to AUTO. Some heat pumps reverse the flow of refrigerant to pick up some outside heat, defrosting the coil in the process. This is typically caused by one of three factors: when it's below 35 outside, you're trying to heat your home by 3 or more, or your heat pump is in . You can check the fan mode by going to Ecobee's Comfort Settings. Note: Normal programmable thermostats have one way to control AUX heat: the AUX lockout temperature. It should turn on the fan and after a minute or two you should feel distinctly warm air coming out of the vents. When your Nest thermostat is in heating mode but your heat pump is blowing cool air, adjust the O/B wire orientation settings of your heat pump on the Nest. Auxiliary . How to test for this: Go outside and watch your outdoor unit. Share this conversation. If you have set your Honeywell thermostat to cool mode and its flashing 'cool on' but blowing warm air instead of cold, your thermostat could be in delay mode. Select Nest Sense. Here's how to fix this: For 2nd and 3rd generation Nests, press the Heat Link button once. Model GMS80704BXCC. Your furnace may be blowing . That means your blower will run 24/7, cycling cold air through your home whenever the heater turns off. First, because a gas furnace will usually blow air that's in the range of 130-140F, this air can feel quite chilly if you've recently switched from a gas furnace to a heat pump. Otherwise, it may indicate that there is a wiring problem with your HVAC system or the Nest's C-wire. Tap. Consequently, why is the auxiliary heat coming on? Check that all connectors that have wires are down (see picture). I have a heat pump system. A professional should check the heat strips and refrigerant level. If it is set to ON, your fan will constantly blow out air, even when your furnace isn't heating it. 03:06. ; At Temperature Scale (F/C) settings, press Next. It blows cold air instead. Aux / W2 - Heat Stage 2 (Heating) W - Heat Stage 1 (Heating) . However, when your heat pump is unable to meet demand via heat transfer, it will tap into its backup heating, or "AUX" heat. Run a diagnostic test on your thermostat 3. 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. Show More. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. That's normal. I can change it to none but we do generally get a few nights a year below -10 and record lows are into the -20s. This forces the outdoor coils to heat up, melting any frost or ice that has built up. Auxiliary heat refers to your heat pump's backup electric resistance heating. The heater's blowing cold, or the AC is blowing hot. New thermostat appears to be trying to heat, but unit is not blowing hot air. It's a smart thermostat. Auixiliary Heat will turn on automatically when heat can no longer efficiently transfer heat from the outside air to heat pump. If you have an air conditioning unit, set this to "AC1".If you have more than one stage cooling, change this to "HP2" or "AC2" to represent this. The supply air won't be as hot as from aux heat or furnace, but it should be 20 to 30F warmer than return air unless it's brutally cold outside. Changing orientations between heating and cooling depends on the heat pumps model that you have. If your furnace or radiators aren't working, you may need to have a local HVAC professional service your system. You need to check if your gas pilot light has gone out. Verify the correct wiring at your furnace/air handler control board and ensure that the wiring matches at the . Auxiliary heat is a heating system that works when the temperature inside a home or building drops lower than two or three degrees from what the temperature is set. Alt heat means the heat pump is turned off and the other source (usually gas furnace) is asked to heat. If this gives heat then the W1 is bad. If the level is low, the heat pump cannot transfer heat efficiently. Using Auxiliary Heat with a Nest Thermostat. So turn the thermostat temp down so it goes blue (cooling). This isn't a problem when it's 55 degrees outsideyour system will expel air that's a toasty warm 110 degrees or so. Restart your Nest thermostat to see if it works or install a C-wire if it is underpowered and unable to heat. So it relies on an auxiliary (AUX) heat coil (like the ones you see in a toaster) or a furnace to heat your home. Besides, what does AUX heat mean on Nest? Go to Main Menu > Comfort Settings. If it gets colder outside than the set lockout temperature, your heat pump will use AUX heat. Nest thermostat Heat Pump Balance settings are for systems that have a heat pump and auxiliary (AUX) heat.With your thermostat Press your thermostat ring to open the Quick View menu. Restart your Nest thermostat to see if it works or install a C-wire if it is underpowered and unable to heat. Setting 0360 is described as "Heat Pump Auxiliary Heat Lockout." The available settings are none and 40 - 60 degrees F in 5 degree increments. If these strips malfunction, the heat pump will blow cold air. The cold air blowing is bothersome and also I think it's a sign that the furnace is not running properly. 1 270 Posted by u/L3ummerTV 2 months ago 2 Thermostat 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. Thank you. There are a couple different reasons for this. Aux/E- Blue . This will help prevent damage to your system and help keep you safe. 1) Verify the wiring. ; If you don't have a heat pump but your home is cold, try our interactive troubleshooter to fix offline, power, and help messages on your Nest thermostat. From here, you have the option to set the fan to "Auto" or "On" in both heat and cool mode. If the breaker continues to trip itself off, there's a bigger issue at play.