This too can cause your heater to blow cold air. When the chilly weather finally arrives, and you have to turn on your furnace for the first time after many months of non-use, the last thing you want to find is that it’s not working. Have you installed a new thermostat lately? Inadequate gas supply. Turn off power to the furnace at its ON/OFF switch. You also don’t want to risk frozen pipes. We use cookies to give you the best possible experience on our website. And because your furnace is no longer heating, the air being pushed into your home will be cold. Luckily, it’s usually very easy to fix, and problems can also be prevented with … If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. A furnace that blows cold air could also indicate that it is overheating. This is sometimes easily solved by resetting the system. New furnaces are equipped with a spark ignitor or electronic ignition, which may require a technician to repair. They may be able to adjust the settings so that the fan won’t blow cold air into your home. What Can I Do If My Heater Is Blowing Cold Air? If the filter looks like the filter to the right in the picture below, replace it. Check your air filter. If you have an oil-fired furnace, its filter can become clogged with dirt and debris, just like an air filter on a gas-fired system. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. If you’re still not getting warm air from your furnace, we can help. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. If the pilot won’t light at all, you may have a faulty gas valve. If not, call a professional. The furnace says it’s a thermostat issue. Your furnace is a controlled fire burning inside your home. Heat Pump Troubleshooting: 3 Common Problems and Solutions, The Rewards of Giving Back: Arista Team Rebuilds a Home in Puerto Rico, Commercial Refrigeration Service & Repair. Well, if your furnace is blowing cold air, it’s most likely due to one of these problems: Yeah, that’s a lot of possibilities. Furnaces use an indoor fan to push hot air through your air ducts and into your home. Is your furnace not blowing hot air? When you get to your destination, you expect to walk into a toasty warm space. Leaks in your ductwork means that cold, unconditioned air from inside your attic gets sucked into your ductwork. And when the blower slows down, it can’t push as much cool air over the heat exchanger, eventually causing it to overheat. This means the fan will run continuously without providing heat. Have your system professionally cleaned to take care of this problem. Large holes and leaks in air ducts can make it seem like your furnace … Well, it could be multiple issues; some of them you can solve yourself. This can cause the air to … Clogged air filters could be causing cold air to blow out of your vents. If your furnace continues to blow cold air then you should check if you have a two-stage furnace. Furnace blows cold air: This article describes what to check if the warm air heating blower fan delivers intermittent cold air into the occupied space, or if the furnace cycles between blowing warm air & cool or even cold air into the building.. Here’s another possible DIY fix for your heater blowing cold air. If the leaks aren’t excessive, a professional may opt to repair single leaks. Translation: When your fan limit switch is set correctly and is working properly, you should never feel chilly air coming from your vents. If you don’t know what a pilot light is, it’s a small flame that runs at all times in order to light the burners in your furnace. You Own a High-Energy, Two-Stage Furnace. 2. That’s why the furnace is not blowing hot air. Incorrect thermostat setting. 1. Make sure your thermostat is set to HEAT and your fan is set to AUTO. 13 Common Causes. However, the fan will keep running, cooling the furnace to protect it from potential damage. Your gas supply could be turned off. Ensure that your thermostat is set higher than the temperature in your home. Without the cooler air of your home flowing through it and keeping the temperature steady, it will continue to burn hotter and hotter, reaching a temperature of 180-200 degrees. In furnaces, most heat exchangers, depending on brand and size, get up to 140-170 degrees Fahrenheit. If you have a gas furnace, a lack of fuel will cause the pilot light to go out. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. In such cases, a safety control device known as the limit switch will shut off the burners. Furnace Blowing Cold Air? 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. Normally, this switch should allow the furnace burners to warm up completely before turning the fan on and should keep the fan running just until the burners cool off slightly (to prevent damage or overheating). Go to your thermostat. Ductwork with a loose connection. Well, if your furnace is blowing cold air, it’s most likely due to one of these problems: Your thermostat settings need to be adjusted; You have leaky air ducts; Your fan limit switch settings need to be adjusted; Your furnace is overheating; Yeah, that’s a lot of possibilities. 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Covid-19 & your HVAC Infrastructure your vents if you have an older furnace with electronic...

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