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furnace blows cold air

Read on to learn the 13 most common reasons for your furnace blowing cold air and when to call for a furnace repair. Learn more from our free guide: HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. See our response to recent issues regarding COVID-19. Unfortunately, you’ll need a professional to fix this problem. However, the fan will keep running, cooling the furnace to protect it from potential damage. This “hot then cold air” sequence happens over and over and your home isn’t warming up. 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. All Rights Reserved. If your furnace is blowing cold air, check your thermostat, air filter and ductwork. One of the most common causes of a furnace blowing cold air is not actually a repair at all. If the pilot won’t light at all, you may have a faulty gas valve. If this is the case, you can simply switch the setting from "on" … If so, someone may have been too hot yesterday, and switched the thermostat fan setting from AUTO to ON. 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). Or the gas line isn’t supplying enough gas to your furnace. If you have a newer furnace with an electronic control panel, you may need to reset the system. Major duct problems. But, if the switch is bad, they’ll need to replace it. Check your air filter. If you did it yourself instead of calling a professional, you may have chosen a thermostat that’s not compatible with your heating system. If so, someone may have been too... 2. If the furnace is cold, it cannot heat the air being propelled outside. But that fan has two modes of operation: ON and AUTO. This is of course a very unsettling problem and not one that you want to face. Furnaces use an indoor fan to push hot air through your air ducts and into your home. Make sure your thermostat is set to HEAT and your fan is set to AUTO. 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. When a furnace blows cold air, there may be an issue with the unit’s electronic control panel. Source. 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. 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. Well, it could be multiple issues; some of them you can solve yourself. If your issue continues, call our team in Tacoma, WA. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. This means the fan will run continuously without providing heat. New furnaces are equipped with a spark ignitor or electronic ignition, which may require a technician to repair. But if you close too many, it increases pressure inside the duct system. This can cause your furnace to lock down for safety. HVAC Preventative Maintenance Contracts: How to Find the Right One for Your HVAC Infrastructure. When the filter is clogged, ignition can be affected and the result is your heating not blowing hot air. If you only feel your furnace blowing cold air briefly, and the air is quickly replaced by warm air, this is the most likely explanation. So you’ve turned on your furnace, but it’s giving you the cold shoulder by blowing cold air. 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? Your gas supply could be turned off. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. 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 continues to blow cold air then you should check if you have a two-stage furnace. So, how do you know which problem is causing your furnace to blow cool air? A flame sensor that’s covered with grime or worn out can cause the burner to keep shutting off. Ensure that your thermostat is set higher than the temperature in your home. The lukewarm air coming out of your furnace can also be the result of leaky air ducts. The stat is reading at 19 but I have it set - Answered by a verified HVAC Technician. This is usually a simple fix, but you’ll need to call a technician to adjust or replace it. A furnace that blows cold air could also indicate that it is overheating. Have an expert inspect your ducts along with the furnace. 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. Even if your furnace is fairly new, things can go wrong that cause this unpleasant surprise. We use cookies to give you the best possible experience on our website. 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. Or, if your system has not been cleaned in a while, a valve could be stuck due to dirt and debris. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. If your furnace is overheating, that means your heat exchanger is getting too hot. If your furnace overheats, it could end up blowing cold air. There are several possible causes for a furnace blowing cold air, so it’s hard to give you advice without more information. Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. Here’s another possible DIY fix for your heater blowing cold air. 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. When this happens, your … When your furnace isn’t running, the air in your ducts cools down. That may be a quick and easy fix. Have you changed your air filter lately? Wait a few minutes, then restart. Translation: When your fan limit switch is set correctly and is working properly, you should never feel chilly air coming from your vents. This extra pressure puts strain on the furnace blower, slowing it down. From dirty air filters to broken thermostats, these are the most common causes of problems. If so, your blower may keep circulating cold air even after the burners fail to light and produce heat. 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. If the filter looks like the filter to the right in the picture below, replace it. If gas supply is interrupted for any reason, the gas furnace pilot light will go out. 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. Luckily, it’s usually very easy to fix, and problems can also be prevented with … Meanwhile, you’ll get cold air because the fan continues to run as a safety measure, even after the furnace isn’t producing heat. First – make it worse. If your thermostat is set to "on" instead of "auto," it could be causing your furnace to blow cold air. Have your system cleaned and checked by an HVAC professional. Try changing the air filter and restarting the furnace. 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. If your furnace is blowing cold air, we’re sorry! 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. 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. Is the Pilot Light lit? Leaks in your ductwork means that cold, unconditioned air from inside your attic gets sucked into your ductwork. 6. So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. 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. If not, call a professional. The longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. © 2021 Patrick Riley, LLC. Instead, you’re blasted with cold air. 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. What Can I Do If My Heater Is Blowing Cold Air? IAQ and Mold in NYC Buildings: Are Kids at Risk. 2. If you have a gas furnace, a lack of fuel will cause the pilot light to go out. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. Have a technician inspect your air ducts for leaks and provide the best solution. Turn off power to the furnace at its ON/OFF switch. Pilot Light. Is your furnace blowing cold air? Thermostat: A Furnace Blowing Cold Air Could be Due to Your Thermostat. 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. Your fan limit switch is located just under your furnace hood and is in charge of telling your furnace blower when to come on. You’ll need a visit from an HVAC professional to make this furnace repair. This could happen from a gust of air caused by someone working near the furnace. If the filter becomes clogged, the unit can start to overheat and cause the burner to shut down. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. 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. Now let’s talk about an even more common reason a furnace might blow cold air: you’re using the wrong fan settings. If your furnace is blowing cold air, not blowing any air at all, or making odd noises, it’s important to schedule a repair as soon as possible. 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. Simply put, the furnace inside the equipment needs to get heated up for the fan to emit warm air. 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 you do manage to relight the pilot but it keeps going out, a faulty thermocouple is likely causing your furnace to blow cold air. Need a tech ASAP? You Own a High-Energy, Two-Stage Furnace. 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. 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. This problem requires a visit from your HVAC repair technician. Common Ignition Problems. Have a professional inspect the fan limit switch. 1. 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. Check that all supply vents are open. So what’s the problem? The fan setting on your thermostat has two options, “on” and “auto”. 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. If the furnace burner itself is neglected, accumulated dust and grime can cause trouble igniting. 3. Ductwork with a loose connection. You also don’t want to risk frozen pipes. 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. Why Is My Furnace Blowing Cold Air? It’s a chilly problem that no one should have to deal with during winter in the Atlanta area! Other thermostat issues. 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. Try changing the batteries. 13 reasons your furnace is blowing cold air 1. If you’re still not getting warm air from your furnace, we can help. 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. There are seven types of problems that can cause your furnace to blow cold air. December 16, 2020. Is your furnace not blowing hot air? If you’ve had the thermostat for a while, the battery might be low. Do you have thermostat wars going on in your office? The furnace says it’s a thermostat issue. In furnaces, most heat exchangers, depending on brand and size, get up to 140-170 degrees Fahrenheit. Afraid it’s too expensive? Why Is My Furnace Blowing Cold Air? If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. If you know how and you’re comfortable doing it, you can try to relight the pilot yourself. Otherwise your electric heater or gas furnace will not turn on. Try turning the furnace off via the power switch. If you have an older furnace with a continuous pilot light, the pilot may have gone out. 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. COVID-19 & Your HVAC System: Your Questions Answered. This can cause the air to … They may be able to adjust the settings so that the fan won’t blow cold air into your home. If you know how, you can clean or replace the filter yourself, but it’s messy and not as easy as an air filter so you may want to leave this job to the pros. Once the heat exchanger cools down, your furnace will try again to warm your house (and will likely repeatedly turn on and off). 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. Check the furnace’s air filter. Wait a few minutes, then flip the switch to ON. If you have an oil-fired furnace, you may be out of fuel. If not, the compromised air flow can cause your furnace to overheat, shutting down the burner. How Does Workplace Ventilation Impact Employee Productivity? So, how do you know which problem is causing your furnace to blow cool air? If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. Do you have thermostat wars going on in your office? That’s why the furnace is not blowing hot air. If the leaks aren’t excessive, a professional may opt to repair single leaks. Your furnace may be blowing cold air because the filter is too dirty. 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. And because your furnace is no longer heating, the air being pushed into your home will be cold. 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. 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. Clogged air filters could be causing cold air to blow out of your vents. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. Go to your thermostat. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. If you have a newer furnace with an electronic ignition, such as an intermittent pilot or a hot surface ignition, your system may need adjustments or replacement of failed parts. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. Even worse, the furnace is blowing cold air! What’s wrong? When you get to your destination, you expect to walk into a toasty warm space. Count your blessings that this time you avoided an expensive furnace repair. If yes, our team in Conway, SC, suggest checking a few things first and then call us for help. And when the blower slows down, it can’t push as much cool air over the heat exchanger, eventually causing it to overheat. ... Start by taking a look at the limit switch. If the furnace still blows cold air, call in a professional. In some cases, you may be able to fix the problem yourself. This usually arises if you haven’t changed your air filter routinely. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. If leaks are excessive, you may want to consider sealing your ducts. Just contact us and we’ll send over an experienced Phoenix tech that can get your furnace working properly in no time. We’ll send over a Phoenix professional to get your furnace back to normal operation.

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