It took me a couple of hours to troubleshoot. Does your furnace blow hot air sometimes, but cold air other times? I don't think the photos made it to the post. However, the symptom of the Nest was that I would turn it on to heat, the dial would turn orange, and it would say 'Delay start in 2:30." For instance, if it’s manually set to the Heat instead of Cool, or when the cooling range is set too high while the mode is set to Auto (eg. It was not. The heat pump may be blowing warm air; it just does not “feel” warm. There are several possible causes for a furnace blowing cold air, so it’s hard to give you advice without more information. I thought maybe the Nest battery was dead (it did keep disconnecting from WiFi and Nest account), so I unplugged it from the wall and charged it from USB. When overheating, your furnace can trip a high limit switch , causing the furnace burners to … It blows cold air, and if I turn the switch off on the side of the unit, then turn it back on, it will fire up the gas and start blowing hot air again. What seems to be a problem, let's take a look first at some parts of the car air conditioning system to have a little background. We answer the most common issues causing your gas furnace to blow cold air instead … Instead, there's a second set of two wires going from C and Y1 on the furnace to some unknown location. If you just turned on the heat, hot air may not yet be flowing through your air ducts. So it’s midwinter and you notice that your heat pump is blowing cold air. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. Since the heater core is often the high point in a cooling system, air can move into it and become trapped. Thermostatic Controls - Hot air blowing in cooling mode on Nest - I recently went from an old AC unit, to a new Nest 3rd Gen. Unreliable car heaters can make the cold winter months practically unbearable. No dice. Then the guy told me it was the compressor, replaced that. I’m having this exact issue and noticed the same blue wire tucked behind the thermostat. No dice. First I was told it was some sort of bracket, replaced that. Check if you see a flame. If your furnace is blowing cold air, we’re sorry! When the heater blows slightly warm instead of cold air, a thermostat with stuck open valves is to be blamed for. The fan just blows regular temperature air that doesn't appear to be heated or cooled. Common causes for AC to blow hot air Thermostat is improperly set I kept turning it on and off and realized that the hot surface ignitor was not glowing. Why is the Heater Blowing Cold Air Instead of Hot? I followed the instructions to the tea with the exception of turning the power to the unit off. With a heater blowing cold air, the first question I’d ask someone is if cold air is blowing from their furnace right after they turn their heat on. Ain't nobody got time for that. I pulled it out and it had no cracks in it, and I used a multimeter to check the resistance, which showed 67.6, which is fine. 1434I just installed a Honeywell RTH9580 wifi thermostat and cannot get it to blow cold. Be sure you’ve set your thermostat to … Since - Answered by a verified HVAC Technician If your AC is blowing hot air, the thermostat may have been accidentally set to “heat.” If this is the case, it’s easy to fix on your own. Gmc :: Yukon AC Blowing Hot Air Instead Of Cold Feb 17, 2014. I went straight to the board and those connections had no power. I did some research before posting here, and have tried the following:-double checked my wiring. From what I was reading, however, the blue wire, when connected to Common, would only help to charge the Nest unit. So, I knew the furnace had power, and the Nest was talking to the furnace. Thanks! Is Your Heater Blowing Out Cold Air? AC blows hot air during the day, but cold air at night You hear a hissing or bubbling noise near AC (this means the leak is significant) Unfortunately, the only way you’ll have low refrigerant levels is if you have a leak (refrigerant isn’t used up like gas, it’s in a closed-loop system). This is actually a common problem that doesn’t really have a simple answer. Press question mark to learn the rest of the keyboard shortcuts. I knew it wasn't the Nest having an issue because it was running smoothly. Unfortunately I have to look into this myself as my roommate is never around or doesn t care to help. This morning, I woke up and plugged it back in to see if it was simply a battery fix on the Nest unit itself. But when your furnace is blowing cold air instead of heat – this can cause multiple problems. Simple problems like dirty air filters could be the cause of your air conditioner blowing hot air. I think my Nest thermostat is blowing cold air instead of hot. We have an upstairs and a downstairs furnace, so it was easier for me to compare the two and see how they worked. Discussion on Google Nest products, including installation and configuration. So, I knew the furnace had power, and the Nest was talking to the furnace. Nest thermostat turns ON AC instead of heat. New comments cannot be posted and votes cannot be cast. -I read in another forum that I may have a heat pump system, so I then tried moving the white wire from w2 aux to o/b. It is a story many people know all too well: the air conditioner is blowing hot air. Of course. Got it hooked up, and discovered it was blowing hot air. Well, there are 3 scenarios that might explain what’s happening with your heat pump: The heat pump isn’t actually blowing cold air, it just feels like it; Your heat pump is blowing cold air … I think I'm going to have to call an actual Nest Pro. Before and after photos of the wiring are below. I see that you fixed it but in case it breaks again -- call Nest. If your furnace is blowing cold air some of the time, but working otherwise, there are a few possible reasons for the problem. Fixing A Gas Furnace Blowing Cold Air Could Be Easy Follwing These 7 Steps First. When his inspector looked at his HVAC system (a heat pump, meaning it both heats and cools the house), a few big problems immediately made themselves known. I followed the wiring guide and during the winter the Heating Stage 1 and I don't know how you ended up becoming you, but don't ever stop. However, only the fan turns on and it doesn't actually cool no matter how long I run it. level 2 Here’s why: The vent air’s temperature might be below your body temperature (which is about 98.6°F). Eventually it will … This is one of the most common issues that people run into when their system is not blowing out cold air. My thermostat and furnace system has been working prior to this installation, so I thought it would be plug and play. When an air conditioning unit is not blowing cold air, it could sometimes be due to certain settings. New comments cannot be posted and votes cannot be cast. Do you have the wires connected to the same terminals as they were in the old thermostat? To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. Incorrect Thermostat Settings. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! The liquid then flows through the radiator and the air absorbs the heat and uses a fan to push it through your vents. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! No dice. Land your white wire on W2/Aux and put your orange wire on O/B. Instead, the motor’s heat gives you a nice (or not so nice in the summer) warm air flow instead, so long as the fan is not frozen as well. Turns out it didn't blow cold forever. Pilot Light Issues So your car's AC was doing fine for the longest time. I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. However, once I set up the Nest and started a heating cycle, I was only getting cool air from outside. Here are five reasons your heat pump might be blowing hot air while on the Cool setting: 1. I am curious why that made a difference, as I understand that the Common wire just gives power from the furnace to the Nest unit. We have two separate furnaces, so I was able to visibly compare the two systems. Then blink 8 red blinks for an hour, while blowing cold air… Hot air blowing from your AC may not be as bad as it seems. Make sure the thermostat is set to “AUTO”, not “ON”. And of course, it always happens on the hottest days of the summer. So Why Is My Furnace Blowing Cold Air Instead Of Heat? I followed the instructions to the tee, took pictures and went back an rechecked my work. Got it hooked up, and discovered it was blowing hot air. I feel like my downstairs blows not so warm air, I'm used to being able to touch the vent and it be warm, but in my new house the heat is def working according to the thermostat but the vent isn't warm. This problem only started recently when it started going from fall to winter. So, I just got a Nest 2 for a forced air furnace system, and I installed it on the wall last night. Gas heater isn't coming on [ 1 Answers ] Our heater is running all the time. 1434I just installed a Honeywell RTH9580 wifi thermostat and cannot get it to blow cold. One of the most common causes of a furnace blowing cold air is not actually a repair at all. Is your furnace not blowing hot air? They said they have a known power sharing defect in the "base" of the nest where the wires go -- They are sending me a replacement base because when I took the heat wire out, the furnace stopped running . This problem could be mainly because of the wrong wiring connection. I (with the help of my neighbor) installed my a Nest Thermostat E last week. The heater’s blowing cold, or the AC is blowing hot. The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. This is what we call a "No Cool", and it's a common air conditioning problem that may or may not be an easy fix. That did the trick. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. Either way, the Nest seems to only blow hot air on both Cool and Heat modes. If it's a forced air system, it'll have a flame in the furnace to heat the air. It blows cold air, and if I turn the switch off on the side of the unit, then turn it back on, it will fire up the gas and start blowing hot air again. The Fan setting will not cool your house; it simply circulates warm air. Check The Thermostat. I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. Picture #1 is wired as if you have a heat pump. This can cause the air to feel only lukewarm. Blue - C Yellow - Y Red - R, bumpered into RC. Press question mark to learn the rest of the keyboard shortcuts. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. If you have a Nest learning thermostat that blows cool air when it’s set in heating mode, you have to adjust the settings of the O/B wire orientation of the heat pump. Gmc :: Yukon AC Blowing Hot Air Instead Of Cold Feb 17, 2014. You can do this by following the steps given below. First I was told it was some sort of bracket, replaced that. Your furnace may be blowing cold air because the filter is too dirty. Check these basic issues before calling in a professional technician! For these checks of power, I had to cycle the Nest to give power to the connections. However, the symptom of the Nest was that I would turn it on to heat, the dial would turn orange, and it would say 'Delay start in 2:30." Even if you are not a DIY home technician, there are generally only a few reasons why your heater might be blowing cold air. My hvac unit blows cold air instead of hot. One of the leading causes of airflow being restricted is having a dirty filter. Now you’re wondering what’s going on. The house is not cooling down. But here are 3 common causes you can fix yourself. The fan setting controls the blower, the part that circulates air throughout your home, Setting it to ON means the blower will run 24/7—regardless of whether the furnace is heating the air or not, thus why you get cold air sometimes. The only time it does not blow hot air is when I turn the air off and only use the fan. We have an upstairs and a downstairs furnace, so it was easier for me to compare the two and see how they worked. Your System Was Just Turned On. Hey, y'all. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: You can also check that the HSI has a visible crack in it and a white spot.) It seems cold air is now blowing out of the intake vent and hot air is blowing out of the vents. If you are not sure how to change your filter, check this article out. My car ac is blowing hot air, supposed to be car air conditioning blows cold air instead of hot air. Rebecca, if I were close to where you live, I would come out and take a look at your system and tell you what was wrong and repair it for you. Lo and behold, I plugged those bad boys in and the HSI fired right up. Air ducts are leaking. TL;DR: If you aren't getting power to your HSI, plug that blue cable into the 'Com' or common port on your furnace board and 'C' behind the Nest. When leaks occur, the cold air surrounding your ducts can get in (and hot air will get out). The top three reasons why a furnace might be blowing cold air instead of warm are include: The Thermostat is set to ‘ON’: ask any professional heating repair man what the first item they check when they are on a heating repair call and most of them will reply ‘the thermostat’. Discussion on Google Nest products, including installation and configuration. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. Car issues can make people scratch their heads. If so, your heat pump is blowing warm air that just feels cold to you. My hvac unit blows cold air instead of hot. A friend of ours bought a new house recently. Initially it would fire on, then shut off, fire on, shut off, 5x. I followed the instructions to the tee, took pictures and went back an rechecked my work. I honestly don’t mean this to be insulting, but you’d be surprised at how many times people are shocked to learn that neither your air conditioning nor your heater will be cold or hot right after you turn them on. If your ducts are leaking (and ENERGY STAR says that almost all homes leak about 30% of the air in their ducts), cold outside air is making its way into your ductwork. A cooling system, air conditioning ) system might stop working it hooked,... 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