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If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. And when the blower slows down, it can’t push as much cool air over the heat exchanger, eventually causing it to overheat. Incorrect thermostat setting. No matter how you travel to work, whether it’s by bus, car or train, your commute probably ends with a cold walk in the icy wind. 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. And when this happens, your fan limit switch (the switch we discussed above) will shut off the burners and keep the fan on until the heat exchanger cools down. If your furnace is blowing cold air, check your thermostat, air filter and ductwork. However, the fan will keep running, cooling the furnace to protect it from potential damage. Need a tech ASAP? This is of course a very unsettling problem and not one that you want to face. When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does. 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.. Furnace Blowing Cold Air? 3. That cold air mixes with the warm air from your furnace, causing the air coming from your vents to feel considerably cooler than it should. December 16, 2020. Many of the causes of furnace problems can be prevented with regularly-scheduled cleaning and maintenance. And because your furnace is no longer heating, the air being pushed into your home will be cold. If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. If so, someone may have been too... 2. We’ll explain each of the problems above, how you’ll know if that’s your particular issue and what you can do to fix it. This could happen from a gust of air caused by someone working near the furnace. Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. Ensure that your thermostat is set higher than the temperature in your home. Luckily, it’s usually very easy to fix, and problems can also be prevented with … Is your furnace blowing cold air? There are seven types of problems that can cause your furnace to blow cold air. Naturally, all heaters use a fan to blow air, but if your fan setting is set to ‘on’ throughout the day, it explains why the heater seems like it has malfunctioned. If you have a gas furnace, a lack of fuel will cause the pilot light to go out. We use cookies to give you the best possible experience on our website. If you know how and you’re comfortable doing it, you can try to relight the pilot yourself. 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. When this happens, your … What Can I Do If My Heater Is Blowing Cold Air? What Happens When You Don’t Change the AC Filter, HVAC System Maintenance: 6 Tips for Heating Season, Essential Equipment for Commercial Kitchens: HVAC Make Up Unit. When a furnace blows cold air, there may be an issue with the unit’s electronic control panel. This is similar to rebooting your computer to fix a software glitch. HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. This extra pressure puts strain on the furnace blower, slowing it down. Have you installed a new thermostat lately? Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. It is usual for cold air to enter the heating system until it is warm, and then for warm air to continue to blow after the air heats up. Here’s another possible DIY fix for your heater blowing cold air. You see, a clogged filter restricts the amount of cool air that runs through your furnace’s system and causes the unit to quickly overheat and shut off. Have your system professionally cleaned to take care of this problem. © 2021 Patrick Riley, LLC. 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. If your furnace overheats, it could end up blowing cold air. So you’ve turned on your furnace, but it’s giving you the cold shoulder by blowing cold air. Is your furnace not blowing hot air? But if you close too many, it increases pressure inside the duct system. If the furnace is on, but the system continues to blow cold air, this is not normal, and there is a problem with the system. When a Furnace Blows Cold Air: Troubleshooting Your Heater It’s time to re-explore an issue that we get called about a lot during this time of the year—a furnace that’s blowing cold air. Your furnace blowing cold air could be caused by hot air escaping through holes in the duct work that carries the heat throughout your building. Do you have thermostat wars going on in your office? You’ve got three basic options. Well, lucky for you, that’s where we come in. Translation: When your fan limit switch is set correctly and is working properly, you should never feel chilly air coming from your vents. In some cases, you may be able to fix the problem yourself. Your furnace can then trip a high limit switch which will, in turn, cause the furnace burners to shut off so that the heat exchangers don’t crack. Turn off power to the furnace at its ON/OFF switch. If this doesn’t fix your problem, and your furnace is still not blowing hot air, you can move on to some of the other potential culprits. That’s why the furnace is not blowing hot air. Clogged air filters could be causing cold air to blow out of your vents. Afraid it’s too expensive? This usually arises if you haven’t changed your air filter routinely. If the furnace still blows cold air, call in a professional. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. If your furnace is blowing cold air, we’re sorry! If you have a newer furnace with an electronic control panel, you may need to reset the system. Try turning the furnace off via the power switch. IAQ and Mold in NYC Buildings: Are Kids at Risk. To help cool the heat exchanger down, the blower motor will continue to run, which will eventually cause the furnace to blow cold air for a short amount of time. The thermocouple is a sensor that controls the gas valve and ignition. Why Is My Furnace Blowing Cold Air? If the filter looks like the filter to the right in the picture below, replace it. The furnace is blowing cold air. Now let’s talk about an even more common reason a furnace might blow cold air: you’re using the wrong fan settings. Simply put, the furnace inside the equipment needs to get heated up for the fan to emit warm air. If you have an older furnace with a continuous pilot light, the pilot may have gone out. If the pilot won’t light at all, you may have a faulty gas valve. Well, it could be multiple issues; some of them you can solve yourself. If gas supply is interrupted for any reason, the gas furnace pilot light will go out. Wait a few minutes, then restart. 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. From dirty air filters to broken thermostats, these are the most common causes of problems. The last thing you want to find is that the furnace is not heating. Check your air filter. So, how do you know which problem is causing your furnace to blow cool air? If so, someone may have been too hot yesterday, and switched the thermostat fan setting from AUTO to ON. Instead, you’re blasted with cold air. You’ll need a visit from an HVAC professional to make this furnace repair. Have a technician inspect your air ducts for leaks, Have a professional inspect the fan limit switch, Your thermostat settings need to be adjusted, Your fan limit switch settings need to be adjusted, Your thermostat fan button is positioned under ON or set to COOL, Your thermostat is still set to COOL not HEAT, Your thermostat fan setting is set to ON not AUTO, Your heating and cooling systems struggle to reach your desired temperature, You have higher-than-normal utility bills, Certain rooms or areas are stuffy or don’t cool/heat properly, You see ductwork with kinks, holes or loose connections, The air coming from your vents is first chilly, eventually turns warm but then gets chilly again before the fan cuts off completely between heating cycles. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! You Own a High-Energy, Two-Stage Furnace. Have an expert inspect your ducts along with the furnace. Check that all supply vents are open. Common reasons your furnace is blowing cold air (and what to do about it) The pilot light is out A pilot light is pretty common in older furnaces. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. There are several possible causes for a furnace blowing cold air, so it’s hard to give you advice without more information. 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. 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. Wait a few minutes, then flip the switch to ON. Make sure your thermostat is set to HEAT and your fan is set to AUTO. This usually results in a confused homeowner who thinks the cold air from their vents means there’s a problem with their furnace when really their HVAC systems are responding properly. Your gas supply could be turned off. That may be a quick and easy fix. If you do manage to relight the pilot but it keeps going out, a faulty thermocouple is likely causing your furnace to blow cold air. Once the heat exchanger cools down, your furnace will try again to warm your house (and will likely repeatedly turn on and off). 2. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. If the leaks aren’t excessive, a professional may opt to repair single leaks. ... Start by taking a look at the limit switch. Source. Even if your furnace is fairly new, things can go wrong that cause this unpleasant surprise. If this doesn’t stop the fan from running constantly or if you’re still getting cold air from your vents in heating mode, have a professional inspect the unit for more complex issues. Leaks in your ductwork means that cold, unconditioned air from inside your attic gets sucked into your ductwork. Why Is My Furnace Blowing Cold Air? COVID-19 & Your HVAC System: Your Questions Answered. How Does Workplace Ventilation Impact Employee Productivity? First – make it worse. If not, call a professional. Consult an HVAC expert for advice. Your supply vents (pictured below) push warm air into your home. But that fan has two modes of operation: ON and AUTO. We’ll send over a Phoenix professional to get your furnace back to normal operation. All Rights Reserved. If your issue continues, call our team in Tacoma, WA. But here are 3 common causes you can fix yourself. Otherwise your electric heater or gas furnace will not turn on. Just contact us. If leaks are excessive, you may want to consider sealing your ducts. If everything seems to work properly, and then your furnace blows cold air back and forth until it switches off, you may be faced with a furnace that has overheated. This can cause your furnace to lock down for safety. When you get to your destination, you expect to walk into a toasty warm space. But, if the switch is bad, they’ll need to replace it. 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. When overheating, your furnace can trip a high limit switch, causing the furnace burners to shut off so that the heat exchanger does not crack. Change the setting back to AUTO, and you’ll have heat again. If your furnace continues to blow cold air then you should check if you have a two-stage furnace. If the furnace burner itself is neglected, accumulated dust and grime can cause trouble igniting. This is sometimes easily solved by resetting the system. This too can cause your heater to blow cold air. This problem requires a visit from your HVAC repair technician. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. Or the gas line isn’t supplying enough gas to your furnace. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. So what’s the problem? Go to your thermostat. 13 reasons your furnace is blowing cold air 1. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. What’s wrong? Furnaces use an indoor fan to push hot air through your air ducts and into your home. Your fan limit switch is located just under your furnace hood and is in charge of telling your furnace blower when to come on. When the fan is on, the furnace will continue to blow, regardless of whether or not the air is being heated. A furnace limit switch uses sensors to read the air temperature inside the furnace and trigger the fan so that the fan only turns on when the air is hot enough and automatically turns off after the furnace quits. Read on to learn the 13 most common reasons for your furnace blowing cold air and when to call for a furnace repair. This is usually a simple fix, but you’ll need to call a technician to adjust or replace it. 6. A furnace that isn’t getting fuel will not ignite and will blow only cold air. If this is the case, you can simply switch the setting from "on" … Do you have thermostat wars going on in your office? If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. If your fan only runs when your furnace is heating the air, then you’re much less likely to experience your furnace blowing cold air. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. Learn more from our free guide: HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. This can be caused by something as simple as a strong draft. Your furnace’s limit switch, which specifically works as a safety measure, has turned your furnace burners off until the unit reaches a safe temperature. If your furnace is overheating, that means your heat exchanger is getting too hot. Even worse, the furnace is blowing cold air! This “hot then cold air” sequence happens over and over and your home isn’t warming up. If yes, our team in Conway, SC, suggest checking a few things first and then call us for help. 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