If your furnace overheats, it could end up blowing cold air. Have an expert inspect your ducts along with the furnace. If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. There are seven types of problems that can cause your furnace to blow cold air. If the furnace burner itself is neglected, accumulated dust and grime can cause trouble igniting. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. Your furnace may be blowing cold air because the filter is too dirty. When a furnace blows cold air, there may be an issue with the unit’s electronic control panel. If the pilot won’t light at all, you may have a faulty gas valve. Is your furnace not blowing hot air? HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. Source. Try changing the batteries. 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. And when the blower slows down, it can’t push as much cool air over the heat exchanger, eventually causing it to overheat. December 16, 2020. If not, the compromised air flow can cause your furnace to overheat, shutting down the burner. This means the fan will run continuously without providing heat. Just contact us and we’ll send over an experienced Phoenix tech that can get your furnace working properly in no time. COVID-19 & Your HVAC System: Your Questions Answered. Consult an HVAC expert for advice. When the fan is on, the furnace will continue to blow, regardless of whether or not the air is being heated. If not, call a professional. If the furnace is cold, it cannot heat the air being propelled outside. You Own a High-Energy, Two-Stage Furnace. Do you have thermostat wars going on in your office? And because your furnace is no longer heating, the air being pushed into your home will be cold. Count your blessings that this time you avoided an expensive furnace repair. So you’ve turned on your furnace, but it’s giving you the cold shoulder by blowing cold air. When your furnace isn’t running, the air in your ducts cools down. Ensure that your thermostat is set higher than the temperature in your home. Even worse, the furnace is blowing cold air! Check the furnace’s air filter. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. Why Is My Furnace Blowing Cold Air? We use cookies to give you the best possible experience on our website. The last thing you want to find is that the furnace is not heating. Even if your furnace is fairly new, things can go wrong that cause this unpleasant surprise. If you haven’t done that yet this winter, call in an HVAC service expert to keep your system in top shape and prevent unexpected failures. Or, if your system has not been cleaned in a while, a valve could be stuck due to dirt and debris. So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. Turn off power to the furnace at its ON/OFF switch. Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. Well, it could be multiple issues; some of them you can solve yourself. So, how do you know which problem is causing your furnace to blow cool air? 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. All Rights Reserved. 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. The best service providers can customize a plan for your needs and your budget. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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. 2. 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. Or the gas line isn’t supplying enough gas to your furnace. That’s why the furnace is not blowing hot air. This problem requires a visit from your HVAC repair technician. If you have an older furnace with a continuous pilot light, the pilot may have gone out. In furnaces, most heat exchangers, depending on brand and size, get up to 140-170 degrees Fahrenheit. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. Check your air filter. However, the fan will keep running, cooling the furnace to protect it from potential damage. If yes, our team in Conway, SC, suggest checking a few things first and then call us for help. The stat is reading at 19 but I have it set - Answered by a verified HVAC Technician. 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. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. 2. Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. Have a professional inspect the fan limit switch. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. This usually arises if you haven’t changed your air filter routinely. See our response to recent issues regarding COVID-19. Common Ignition Problems. Wait a few minutes, then flip the switch to ON. If the filter becomes clogged, the unit can start to overheat and cause the burner to shut down. Other thermostat issues. If you’ve had the thermostat for a while, the battery might be low. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. 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. 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. 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. Check that all supply vents are open. This can be caused by something as simple as a strong draft. Try changing the air filter and restarting the furnace. First – make it worse. If the filter looks like the filter to the right in the picture below, replace it. This “hot then cold air” sequence happens over and over and your home isn’t warming up. 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. Have you installed a new thermostat lately? Pilot Light. This is usually a simple fix, but you’ll need to call a technician to adjust or replace it. 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. Your gas supply could be turned off. 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. 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. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. But, if the switch is bad, they’ll need to replace it. 1. The furnace is blowing cold air. © 2021 Patrick Riley, LLC. 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. Do this: Turn off your furnace at the thermostat, and check the furnace … But if you close too many, it increases pressure inside the duct system. It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! So, if you have a tripped breaker, the furnace may stay on however, the air can’t warm up because the gas burner can’t ignite. 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. 6. It’s common for a furnace to blow cold air when you turn it on for the first time each season, but it can also happen at any time if something goes wrong. We’ll send over a Phoenix professional to get your furnace back to normal operation. When the filter is clogged, ignition can be affected and the result is your heating not blowing hot air. If your furnace continues to blow cold air then you should check if you have a two-stage furnace. 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. If so, someone may have been too hot yesterday, and switched the thermostat fan setting from AUTO to ON. What’s wrong? 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" … This could happen from a gust of air caused by someone working near the furnace. One of the most common causes of a furnace blowing cold air is not actually a repair at all. 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.. If you have an oil-fired furnace, you may be out of fuel. This is of course a very unsettling problem and not one that you want to face. Make sure your thermostat is set to HEAT and your fan is set to AUTO. Inadequate gas supply. Two thermostat issues that could cause your furnace to blow cold air include: Yeah, we know the first one seems like a pretty silly problem but you’d be surprised by how many residents in Phoenix leave their thermostat set to COOL year round and just forget about their HEAT button altogether. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. If your furnace continues to overheat and blow cold air after you replace the filter and open all supply vents, have a professional inspect the system for other issues. 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. A furnace that blows cold air could also indicate that it is overheating. If your issue continues, call our team in Tacoma, WA. Major duct problems. But you need to know when to call in the furnace repair pros so you don’t have to spend unnecessary time in the cold and interrupt your business. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. 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. Is your furnace blowing cold air? Is the Pilot Light lit? Furnace Blowing Cold Air? Translation: When your fan limit switch is set correctly and is working properly, you should never feel chilly air coming from your vents. So, how do you know which problem is causing your furnace to blow cool air? If your ducts have cracks or worse, then the cold air blowing into your house might be coming straight from outside right into your ducts, mixed in with the warm air your perfectly functional furnace is producing. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. Two-stage furnaces are popular in colder areas like Montana because they have a different set of programming and valve positions that help keep your home warmer throughout the year. Incorrect thermostat setting. If you’re still not getting warm air from your furnace, we can help. 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. Well, lucky for you, that’s where we come in. Learn more from our free guide: HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. Read on to learn the 13 most common reasons for your furnace blowing cold air and when to call for a furnace repair. 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. This can cause the air to … Leaks in your ductwork means that cold, unconditioned air from inside your attic gets sucked into your ductwork. Excessive, a professional may opt to repair accumulated dust and grime can cause the pilot may have faulty! 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