The nest seems to blow warm air normally but once it switches to alternative heat source, then it starts blowing cold air. 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. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. You can do this by following the steps given below. I have switched the thermostat to heat now that winter is here, but only cold air will blow from the vents, even though it is set to heat to 72 degrees (Fahrenheit). No dice. level 2 When leaks occur, the cold air surrounding your ducts can get in (and hot air will get out). This time of year, especially when it gets cold outside in the evenings, we get many calls from homeowners concerned that there is cold air blowing out of the duct registers in their home when their heat is running. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! Your thermostat’s fan setting may be set to ON. The system worked fine prior to Nest install. This is one of the most common issues that people run into when their system is not blowing out cold air. Of course. When I turned on the cool mode (and after the warming up period) it starts to blow warm/hot air. Hey, y'all. First I was told it was some sort of bracket, replaced that. The house is not cooling down. I followed the instructions to the tee, took pictures and went back an rechecked my work. Here are just a few things that could mean: 1) Dead Batteries in Thermostat 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. -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. Check if you see a flame. Unfortunately I have to look into this myself as my roommate is never around or doesn t care to help. So even though the heat pump is creating warm air (usually 80-95°F), it may feel cool to you because it’s not as warm as your body temperature. Update amazon now offers a free smart home consultation After two not helpful calls with Honeywell, I have the unit set on Cooling and it is blowing hot air. I did some research before posting here, and have tried the following:-double checked my wiring. This is actually a common problem that doesn’t really have a simple answer. A friend of ours bought a new house recently. I followed the instructions to the tea with the exception of turning the power to the unit off. Discussion on Google Nest products, including installation and configuration. Then blink 8 red blinks for an hour, while blowing cold air… There are many possible causes, so let’s explore some of the most common ones. Thanks! 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. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! 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. Press question mark to learn the rest of the keyboard shortcuts. There are several possible causes for a furnace blowing cold air, so it’s hard to give you advice without more information. Incorrect Thermostat Settings. However, only the fan turns on and it doesn't actually cool no matter how long I run it. Here is a picture of stuff blowing out of intake vent. But when your furnace is blowing cold air instead of heat – this can cause multiple problems. Freon AC Refill: http://amzn.to/2HPlaLAHow to fix car blowing hot air when AC is on. Then the guy told me it was the compressor, replaced that. Thanks for this as it did the trick for me as well! 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 … Nothing would happen after that other than the furnace turning on and blowing air from outside into the house. Pilot Light Issues -I tried changing the intake direction of the pump. Blowing hot air means you probably wired it according to the conventional row on your old thermostat instead of the heat pump row. Green G, orange O, white W2, red r, yellow y1, blue c. Just wanted to weigh in -- I had the same problem with the nest only blowing hot air no matter what, had to turn off the breaker to stop it. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: This problem only started recently when it started going from fall to winter. 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. Incorrect Thermostat Settings. 1434I just installed a Honeywell RTH9580 wifi thermostat and cannot get it to blow cold. So it’s midwinter and you notice that your heat pump is blowing cold air. Nest thermostat turns ON AC instead of heat. Lo and behold, I plugged those bad boys in and the HSI fired right up. 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. Here’s why: The vent air’s temperature might be below your body temperature (which is about 98.6°F). Your System Was Just Turned On. It's a Nest 3 and we bought it in July this year. Is your furnace blowing cold air instead of warm air? I live with my roommate who has a Nest thermostat. About $1K later, he returned the vehicle to me, and the A/C worked about one hour, and even then wasn't super cold. So your car's AC was doing fine for the longest time. But here are 3 common causes you can fix yourself. Be sure you’ve set your thermostat to Auto or On, as well as Cool. Is your furnace not blowing hot air? Picture #1 is wired as if you have a heat pump. Nothing would happen after that other than the furnace turning on and blowing air from outside into the house. First I was told it was some sort of bracket, replaced that. 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 the A/C is blowing hot air, you can get frustrated, but there is no reason to lose your cool. New comments cannot be posted and votes cannot be cast. In your case: White - W2 Green - G Orange - I can't tell if it is W1 or W3 or just W in your picture. Got a Nest 3rd gen thermostat. After a bit of research, I learned that my unit works by sending power to a hot surface ignitor, sending gas in that direction to ignite it and boom ya got some heat. Causes and how to prevent it from happening again: Inside of the unit, condensation can occur on … There are a few different factors that could be causing the confusion with the airflow. The fan just blows regular temperature air that doesn't appear to be heated or cooled. One of the leading causes of airflow being restricted is having a dirty filter. 1434I just installed a Honeywell RTH9580 wifi thermostat and cannot get it to blow cold. Well, now he has another one. It took me a couple of hours to troubleshoot. Even if you are not a DIY home technician, there are generally only a few reasons why your heater might be blowing cold air. Hot air blowing from your AC may not be as bad as it seems. 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. Got a Nest 3rd gen thermostat. First warm weather using my nest thermostat and now trying to use the central air. Blue - C Yellow - Y Red - R, bumpered into RC. 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. When the heater blows slightly warm instead of cold air, a thermostat with stuck open valves is to be blamed for. Even if you are not a DIY home technician, there are generally only a few reasons why your heater might be blowing cold air. The Fan setting will not cool your house; it simply circulates warm air. I don't know how you ended up becoming you, but don't ever stop. 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. I did some research before posting here, and have tried the following: -double checked my wiring. Is Your Heater Blowing Out Cold Air? If it's a forced air system, it'll have a flame in the furnace to heat the air. Wait This is an important step, especially if you have a new furnace or a new home. 7. 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." Your heat pump might be in “defrost mode” When in defrost mode, a heat pump may blast cold air from its vents for 1 or 2 minutes (before the backup heat kicks in). If you are one of those unlucky people and dealing with a heater blowing out only cool air instead of hot, then there is a chance that it might be an easy problem to fix for the do it yourselfer. (If it shows nothing or above 90, I think, it's toast. Attempting to make this question the end all for "my furnace is blowing cold" In my case, I had a furnace that just "blew cold" forever. I knew it wasn't the Nest having an issue because it was running smoothly. My tents put one of those "Nest" thermostats (programmable via internet an phone app) on my air conditioning unit. But all you have to work with are the symptoms. It was not. I followed the wiring guide and during the winter the Heating Stage 1 and The only time it does not blow hot air is when I turn the air off and only use the fan. So Why Is My Furnace Blowing Cold Air Instead Of Heat? All these concurrences leading to the problem of car heater blowing cold air. That outside air in the mix lowers the temperature of the air that’s just come from your furnace. We tested it and it seemed to work, but I didn't test the AC part long enough apparently. We can schedule an estimate for your duct sealing in Cincinnati, Morrow, Lebanon, or the surrounding areas in Ohio. If you are not sure how to change your filter, check this article out. Check The Thermostat. There are directions in the book what to do here. Press J to jump to the feed. Press question mark to learn the rest of the keyboard shortcuts. Then, gradually, you began to notice that it wasn't really blowing cold air anymore, or that it would only blow cold when the car was moving but not at idle. I see that you fixed it but in case it breaks again -- call Nest. Turns out it didn't blow cold forever. It seems cold air is now blowing out of the intake vent and hot air is blowing out of the vents. Car owners rely on their air conditioners to cool the interior quickly when they sit behind the wheel. If you want to stop your vents from blowing out cold air while your furnace is running and save money on your monthly utility bills, contact Rick’s Heating & Cooling today. do you not see the two + symbols to expand the photo? So, I just got a Nest 2 for a forced air furnace system, and I installed it on the wall last night. New comments cannot be posted and votes cannot be cast. Thermostatic Controls - Hot air blowing in cooling mode on Nest - I recently went from an old AC unit, to a new Nest 3rd Gen. The heat pump may be blowing warm air; it just does not “feel” warm. My car ac is blowing hot air, supposed to be car air conditioning blows cold air instead of hot air. Heat Pump Blowing Cold Air | Refrigeration Heating Troubleshooting. If you just turned on the heat, hot air may not yet be flowing through your air ducts. My A/C wasn't working (blowing hot air instead of cold), so I had some repairs done. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. Instead, there's a second set of two wires going from C and Y1 on the furnace to some unknown location. Since the heater core is often the high point in a cooling system, air can move into it and become trapped. Nothing would happen after that other than the furnace turning on and blowing air from outside into the house. Discussion on Google Nest products, including installation and configuration. However, once I set up the Nest and started a heating cycle, I was only getting cool air from outside. Either way, the Nest seems to only blow hot air on both Cool and Heat modes. We have an upstairs and a downstairs furnace, so it was easier for me to compare the two and see how they worked. We have two separate furnaces, so I was able to visibly compare the two systems. I believe you then need to go into the settings of the nest and tell it to energize the reversing valve with O in cooling. If your forced-air gas furnace is blowing cold air, a number of factors could be to blame—many of which you can address on your own, without the immediate help of a service professional. Gas heater isn't coming on [ 1 Answers ]. This morning, I woke up and plugged it back in to see if it was simply a battery fix on the Nest unit itself. Last night, I was Youtubing some stuff on the Nest and common issues, and the only thing I found which was interesting related to a blue cable that was tucked in the harness going to my existing thermostat. We have an upstairs and a downstairs furnace, so it was easier for me to compare the two and see how they worked. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. Before calling a technician, the first thing you should do is take note of your thermostat settings. Additionally, you want to make sure that the batteries are working and that the temperature is not set too high. Got it hooked up, and discovered it was blowing hot air. I (with the help of my neighbor) installed my a Nest Thermostat E last week. 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. There are several possible causes for a furnace blowing cold air, so it’s hard to give you advice without more information. 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. So, I knew the furnace had power, and the Nest was talking to the furnace. 7 Possible Reasons Your Home Heater/Furnace Is Blowing Cold Air. Simple problems like dirty air filters could be the cause of your air conditioner blowing hot air. Gas heater isn't coming on [ 1 Answers ] Our heater is running all the time. If it’s dirty, change it! Eventually it will … If you are one of those unlucky people and dealing with a heater blowing out only cool air instead of hot, then there is a chance that it might be an easy problem to fix for the do it yourselfer. Got it hooked up, and discovered it was blowing hot air. So, I knew the furnace had power, and the Nest was talking to the furnace. I think I'm going to have to call an actual Nest Pro. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot 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). The cooler air is what ends up blowing into your living areas. My hvac unit blows cold air instead of hot. Heating system issues rank on a level playing field with visits to the IRS, or the dentist as items that cause Scottsdale residents tremendous stress. If this is the case, simply change out the filter. I did speak with one earlier today about connecting the wire, and he said that they just go ahead and connect the common every time they install a Nest thermostat because of the number of units that have issues. Here are five reasons your heat pump might be blowing hot air while on the Cool setting: 1. If your furnace is blowing cold air, we’re sorry! I just installed a Honeywell rth2310b programmable thermostat and now it is blowing hot air instead of cold in the cool mode. I kept turning it on and off and realized that the hot surface ignitor was not glowing. Before calling a technician, the first thing you should do is take note of your thermostat settings. 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. Do you have a forced air system? It is a story many people know all too well: the air conditioner is blowing hot air. There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. Initially it would fire on, then shut off, fire on, shut off, 5x. Nest thermostat turns ON AC instead of heat This problem could be mainly because of the wrong wiring connection. Why Is My Car Blowing Hot Air Instead of Cold? I followed the instructions to the tee, took pictures and went back an rechecked my work. But here are 3 common causes you can fix yourself. When I needed to turn it on the other day the air never got cool, in fact it seemed warm and warmed up the area some. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. Do you have the wires connected to the same terminals as they were in the old thermostat? 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. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. My A/C wasn't working (blowing hot air instead of cold), so I had some repairs done. You can also check that the HSI has a visible crack in it and a white spot.) I think my Nest thermostat is blowing cold air instead of hot. Press J to jump to the feed. From what I was reading, however, the blue wire, when connected to Common, would only help to charge the Nest unit. No dice. Why is the Heater Blowing Cold Air Instead of Hot? 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 heater’s blowing cold, or the AC is blowing hot. Then the guy told me it was the compressor, replaced that. That did the trick. 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 . My thermostat and furnace system has been working prior to this installation, so I thought it would be plug and play. Since - Answered by a verified HVAC Technician Before and after photos of the wiring are below. 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. I’m having this exact issue and noticed the same blue wire tucked behind the thermostat. 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. Now you’re wondering what’s going on. Check these basic issues before calling in a professional technician! Another common problem is when air gets into the cooling system. There are many reasons an HVAC (heating, ventilation, air conditioning) system might stop working. When a thermostat gets stuck to the ‘open’ position, the engine takes a much longer time to warm up. 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. Ain't nobody got time for that. I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. Here are five reasons your heat pump might be blowing hot air while on the Cool setting: 1. Car issues can make people scratch their heads. Air ducts are leaking. If so, your heat pump is blowing warm air that just feels cold to you. So, I knew the furnace had power, and the Nest was talking to the furnace. Your furnace may be blowing cold air because the filter is too dirty. This can cause the air to feel only lukewarm. Pulling the shell off of the furnace, there was the same blue wire, tucked behind the harness. 25-30°). Looking that up, I found that the HSI is basically a resistor, and when an HSI cracks, it won't glow. If you notice your furnace only blows cold air on occasion but your home is still maintaining its temperature than this may be simply a setting on your thermostat. 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." 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. No dice. Our heater is running all the time. Air trapped in the heater core. No dice. When an air conditioning unit is not blowing cold air, it could sometimes be due to certain settings. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. If your car heater is suddenly blowing out cold air instead of heat in the middle of a bitterly cold winter, you have a good reason to be frustrated. For these checks of power, I had to cycle the Nest to give power to the connections. 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. Does your furnace blow hot air sometimes, but cold air other times? Make sure the thermostat is set to “AUTO”, not “ON”. Update: While I see the unconnected blue wire behind my upstairs thermostat, it doesn't look like it's actually connected to the furnace. If your furnace is blowing cold air, we’re sorry! Be sure you’ve set your thermostat to … Update amazon now offers a free smart home consultation After two not helpful calls with Honeywell, I have the unit set on Cooling and it is blowing hot air. 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’. One of the most common causes of a furnace blowing cold air is not actually a repair at all. I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. Gmc :: Yukon AC Blowing Hot Air Instead Of Cold Feb 17, 2014. And of course, it always happens on the hottest days of the summer. There are a few reasons your heat pump could be blowing cold air. Land your white wire on W2/Aux and put your orange wire on O/B. When overheating, your furnace can trip a high limit switch , causing the furnace burners to … I then checked the power to the HSI through the harness, which showed no power. This problem could be mainly because of the wrong wiring connection. Because I had no power, I looked it up and basically found out I had to replace the whole board. I don't think the photos made it to the post. I went straight to the board and those connections had no power. Unreliable car heaters can make the cold winter months practically unbearable. We answer the most common issues causing your gas furnace to blow cold air instead … Gmc :: Yukon AC Blowing Hot Air Instead Of Cold Feb 17, 2014. 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. That may be a quick and easy fix. 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