So, I just got a Nest 2 for a forced air furnace system, and I installed it on the wall last night. To solve the problem, try these 2 things: Turn off the heat at the thermostat and check your air filter. This can cause the air to feel only lukewarm. Discussion on Google Nest products, including installation and configuration. Land your white wire on W2/Aux and put your orange wire on O/B. 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. Does your furnace blow hot air sometimes, but cold air other times? 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. I think I'm going to have to call an actual Nest Pro. No dice. I kept turning it on and off and realized that the hot surface ignitor was not glowing. My hvac unit blows cold air instead of hot. 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. Hot air blowing from your AC may not be as bad as it seems. I think my Nest thermostat is blowing cold air instead of hot. Is Your Heater Blowing Out Cold 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. So, I knew the furnace had power, and the Nest was talking to the furnace. (It worked perfectly in the winter with this setup) Looking at the furnace and NEST, the wiring is as follows: Incorrect Thermostat Settings. 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 … First I was told it was some sort of bracket, replaced that. 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. There are other reasons your heat pump could be blowing cold air instead of heat, but those are the basics. It blows cold air when the heat is on. 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. If this is the case, simply change out the filter. One of the leading causes of airflow being restricted is having a dirty filter. Discussion on Google Nest products, including installation and configuration. Press question mark to learn the rest of the keyboard shortcuts. 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. However, only the fan turns on and it doesn't actually cool no matter how long I run it. Ain't nobody got time for that. We have an upstairs and a downstairs furnace, so it was easier for me to compare the two and see how they worked. Gmc :: Yukon AC Blowing Hot Air Instead Of Cold Feb 17, 2014. The only time it does not blow hot air is when I turn the air off and only use the fan. 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. Nothing would happen after that other than the furnace turning on and blowing air from outside into the house. 7 Reasons Your Heater Blows Cold Air/AC Blows Hot Air. Update: While I see the unconnected blue wire behind my upstairs thermostat, it doesn't look like it's actually connected to the furnace. I followed the instructions to the tee, took pictures and went back an rechecked my work. 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." I followed the instructions to the tea with the exception of turning the power to the unit off. Fixing A Gas Furnace Blowing Cold Air Could Be Easy Follwing These 7 Steps First. Looking that up, I found that the HSI is basically a resistor, and when an HSI cracks, it won't glow. 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. I then checked the power to the HSI through the harness, which showed no power. Either way, the Nest seems to only blow hot air on both Cool and Heat modes. -I tried changing the intake direction of the pump. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! Why is the Heater Blowing Cold Air Instead of Hot? 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