If you are not sure how to change your filter, check this article out. Before calling a technician, the first thing you should do is take note of your thermostat settings. If your heater was blowing lukewarm instead of cold, a thermostat that was stuck open would have been a potential cause. 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. Either way, the Nest seems to only blow hot air on both Cool and Heat modes. Now you’re wondering what’s going on. 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. Got a Nest 3rd gen thermostat. I then checked the power to the HSI through the harness, which showed no power. It was not. This problem could be mainly because of the wrong wiring connection. Picture #1 is wired as if you have a heat pump. Is Your Heater Blowing Out Cold Air? So it’s midwinter and you notice that your heat pump is blowing cold air. When the A/C is blowing hot air, you can get frustrated, but there is no reason to lose your cool. 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. 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. Check if you see a flame. 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. 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." (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: We have an upstairs and a downstairs furnace, so it was easier for me to compare the two and see how they worked. I think my Nest thermostat is blowing cold air instead of hot. Initially it would fire on, then shut off, fire on, shut off, 5x. That outside air in the mix lowers the temperature of the air that’s just come from your furnace. -I tried changing the intake direction of the pump. When overheating, your furnace can trip a high limit switch , causing the furnace burners to … Looking that up, I found that the HSI is basically a resistor, and when an HSI cracks, it won't glow. Then blink 8 red blinks for an hour, while blowing cold air… Thanks for this as it did the trick for me as well! 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. Ain't nobody got time for that. That did the trick. I just installed a Honeywell rth2310b programmable thermostat and now it is blowing hot air instead of cold in the cool mode. The heat pump may be blowing warm air; it just does not “feel” warm. Reset thermostat to factory. Here’s why: The vent air’s temperature might be below your body temperature (which is about 98.6°F). Unreliable car heaters can make the cold winter months practically unbearable. If it's a forced air system, it'll have a flame in the furnace to heat the air. 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. Car issues can make people scratch their heads. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. If your furnace is blowing cold air, we’re sorry! But here are 3 common causes you can fix yourself. The only time it does not blow hot air is when I turn the air off and only use the fan. 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. 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. I had mis-placed the Y2 wire (white wire), so I corrected and placed it in w2 aux instead. The house is not cooling down. It seems cold air is now blowing out of the intake vent and hot air is blowing out of the vents. Does your furnace blow hot air sometimes, but cold air other times? Instead, there's a second set of two wires going from C and Y1 on the furnace to some unknown location. No dice. 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. Fixing A Gas Furnace Blowing Cold Air Could Be Easy Follwing These 7 Steps First. There are several possible causes for a furnace blowing cold air, so it’s hard to give you advice without more information. 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. Lo and behold, I plugged those bad boys in and the HSI fired right up. For these checks of power, I had to cycle the Nest to give power to the connections. Your thermostat’s fan setting may be set to ON. Land your white wire on W2/Aux and put your orange wire on O/B. A friend of ours bought a new house recently. 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. 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. So, I just got a Nest 2 for a forced air furnace system, and I installed it on the wall last night. Even if you are not a DIY home technician, there are generally only a few reasons why your heater might be blowing cold air. I think I'm going to have to call an actual Nest Pro. It took me a couple of hours to troubleshoot. No dice. 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’. 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. 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. Thermostat E not blowing Cold Air. First warm weather using my nest thermostat and now trying to use the central air. Press question mark to learn the rest of the keyboard shortcuts. New comments cannot be posted and votes cannot be cast. All these concurrences leading to the problem of car heater blowing cold air. do you not see the two + symbols to expand the photo? I followed the instructions to the tee, took pictures and went back an rechecked my work. You can do this by following the steps given below. Eventually it will … Before calling a technician, the first thing you should do is take note of your thermostat settings. I live with my roommate who has a Nest thermostat. (If it shows nothing or above 90, I think, it's toast. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! Our heater is running all the time. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. My hvac unit blows cold air instead of hot. I don't think the photos made it to the post. Nest thermostat turns ON AC instead of heat. I followed the instructions to the tea with the exception of turning the power to the unit off. Incorrect Thermostat Settings. 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. 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. No dice. There are a few different factors that could be causing the confusion with the airflow. 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. Nothing would happen after that other than the furnace turning on and blowing air from outside into the house. 7. Pilot Light Issues 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. Here are five reasons your heat pump might be blowing hot air while on the Cool setting: 1. Check The Thermostat. Then the guy told me it was the compressor, replaced that. When I turned on the cool mode (and after the warming up period) it starts to blow warm/hot air. 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. Got a Nest 3rd gen thermostat. 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. Be sure you’ve set your thermostat to Auto or On, as well as Cool. Simply flip the thermostat setting back to “cool” and see if the air conditioner begins to blow cool air again. There are many possible causes, so let’s explore some of the most common ones. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. The system worked fine prior to Nest install. And of course, it always happens on the hottest days of the summer. 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. 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