Your furnace’s fan will run persistently because as far as a possible switch is no longer working or is almost dead. If your furnace fan is set to ON, the fan runs continuously, whether or not your furnace is producing heat. As your heating system ages, grime and debris may build up—causing your furnace to blow cold air. Learn about our energy efficient innovations that can help you save on your heating & cooling energy expenses, while ensuring your home is comfortable. Our HVAC specialists will do a check-up of your equipment and repair it if needed. If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. A malfunctioning flame sensor shuts down the furnace when the burner is working correctly (flames are present) because it does not sense the heat. Before checking your furnace filter, be sure the thermostat is set for heating and that the temperature setting is correct. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. If you suspect your furnace is overheating, it will start blowing cool air to lower the temperature to a safe level. Major duct problems. We care for your comfort and so we care about your investment on your HVAC appliances.Reach us for a genuine quote and expert advice. Or, if you have a high efficiency, multi-stage furnace, it might be operating on low stage heating and you just aren’t getting that full-on blast of heat you normally expect. There may be some problems with it, mostly if it has not been set correctly. Check Your Air Filter. Press question mark to learn the rest of the keyboard shortcuts. The blower keeps blowing to cool the furnace down to a safe level. 6. If you only have a furnace and the ventilation works only in winter and don’t have pets, replace it once a year. Compromised flame sensor. On the off chance that the button comes up short, it will “bomb open.” It makes the furnace control board feel that the furnace has overheated. 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. There could be several reasons for this, so it’s always a good idea to troubleshoot your furnace, especially as it can help the heating engineer who eventually will be needed to repair your appliance. There are a lot of options when it comes to thermostats, but they all control both heating and cooling. Here are some of the common and uncommon reasons we see furnaces blowing cold air. But that fan has two modes of operation: ON and AUTO. Note that the filter needs to be replaced more frequently in new construction due to interior finishing work while the system is in operation. To be noted, there is a conflicting, What is a Furnace Filter? But if you have an older model furnace, your home is too cold and the furnace hasn’t turned on, your pilot light may be out. Note that cleaning of the ventilation ducts may be required. Always have a licensed professional examine or repair a furnace or HVAC system when necessary. 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. Contact the service department about our replacement filters. At the end of the heating process, it waits until the internal air temperature drops below its predetermined level, then shuts down the fan until the next heating cycle begins. Heating of water can be done through two specified methods: using a boiler and using a water heater. Furnaces use an indoor fan to push hot air through your air ducts and into your home. This can cause your furnace to lock down for safety. The low battery can register incorrect temperature inputs on the thermostat, which may very well be the cause of the cold air problem. If so, the limit switch, a furnace safety device, turned the furnace burners off. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. If the fan limit switch malfunctions, the blower might continue to operate even when the furnace is not heating the air resulting in your furnace blowing cold air from your registers. 11. Its responsibility is to eliminate water that is made during the warming cycle. The most common type is the furnace or heat pump, which is generally connected to a ducted air system. A furnace that isn’t getting fuel will not ignite and will blow only cold air. If it does, and you still want to close a few vents, try closing fewer vents this time. In the future, perform annual furnace maintenance to make sure it is ready for use in cold weather. If you have exposed ductwork, typically in a basement or crawlspace, checking for leaks can be relatively easy. Numerous new furnaces are considerably more effective and have various techniques for lighting your furnace. Dirty Gas or Oil Burner. This function allows the furnace to warm up the air before the blower pushes it out through the ductwork and into your living areas. Some reasons your furnace is blowing cold air: 1. 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. If cleaning or replacing the filter doesn’t solve the problem, contact your local Carrier dealer for assistance. However, furnaces are “sized” to efficiently deliver comfort to the entire home. It's also possible that the furnace's pilot light isn't well shielded. Basic filters are often inside the furnace cabinet, but larger, 4-inch media filters, electronic air cleaners, and whole-home air purifiers are likely mounted outside the furnace between the cabinet and the return air duct. This short delay is intended to keep you more comfortable by eliminating an initial blast of cold air from your heat vents. 0:00. The most widely recognized reason for this issue is steady overheating, usually brought about by clogged channels. A properly working flame sensor will shut down the furnace if it does not detect a flame while the gas valve is operating. Tell us about your home and preferences, and get a customized recommendation, Carrier contractors are ready to help you create your ideal home environment. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. Replacing the sensor should be a fairly easy fix for your contractor as well. A full, clogged filter reduces airflow and minimizes system performance. Fullscreen. Since the 1990s, the industry has shifted to using pilotless ignition systems such as hot surface igniters, so pilot-related issues are becoming less common. If the pilot light is out, follow the manufacturer’s directions on how to relight the pilot. If you’ve checked all of the easy-to-remedy reasons that can result in your furnace blowing cold air and you still haven’t solved the problem, it may be time to contact your local Carrier® indoor comfort expert to see if your furnace needs to be serviced, adjusted or replaced. When the furnace is turned on after a certain period, whether it be days, weeks or months, turning on the system does not mean that warm air will automatically begin to pass through the vents. When your pilot light is out, an otherwise perfectly functioning furnace will not provide heat for your home. Your first instinct may be to look to your HVAC unit when you are having issues with your seating system blowing out cold air but another probable source is your thermostat. While your first instinct might be to call your HVAC contractor, your furnace might be operating normally. Leaky ductwork not only leads to reduced comfort, it can result in higher utility bills because of the amount of heat lost due to the leakage. A friend of ours bought a new house recently. Check the temperature setting to make sure somebody else didn’t change it to a lower setting. You want to curl up in a cozy house after you deal with harsh weather conditions, so it’s time to take a look at the reasons the furnace may be blowing cold. The fan setting on your thermostat has two options, “on” and “auto”. Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position. We strive to provide the best service possible for our clients. The furnace blowing cold air, or there is no heat in the house. What Is the Cost to Buy or Replace a Home Furnace? A dirty air filter can restrict airflow, causing the heat exchanger to get too hot, and in turn causing the fan limit switch to shut down the furnace. When the furnace is turned on after a certain period, whether it be days, weeks or months, turning on the system does not mean that warm air will automatically begin to pass through the vents. If it won’t stay lit, it’s time to call a professional. If you’re uncomfortable doing it yourself, call a friend or family member to assist you. When it is chilly, having a heater that is not working is a major cause of concern. As soon as the furnace cycles back on the air will warm up again. 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. A 4 to 5-inch thick disposable cartridge should generally be replaced every six (6) months if your system is equipped with an air conditioner or heat pump. Depending upon the age, condition and quality of the construction, your home’s ductwork may have some significant leakage. We can also help you with annual maintenance and installation. You hear your furnace kick on... but there is no airflow or you find the furnace blowing cold air. Support team members will give you an estimate on how much you will need to pay for the service – so you won’t have any surprises. Learn how to choose and maintain your HVAC system. Less commonly, if you have a duel-fuel system (heat pump/gas furnace combination) the heat pump will warm your home with a lower air temperature than provided by the gas furnace, which could make it seem like your system is blowing cold. This can be caused by something as simple as a strong draft. We also sell high-efficiency filters more efficiently than your usual filter and ultra-violet neon lights against germs and dust mites. If you notice a room is too cold or hot... inconsistent temperatures in different areas of your home... the temperature reading on your thermostat doesn’t match the temperature you set... or if your furnace is constantly turning on and then back off after a short time (short cycling), you may have too many closed vents. Inadequate gas supply. How Often You Need to Replace Your Furnace Filters. Like a gas water furnace, the pilot of a gas furnace can shut off for several reasons. And remember: Routine furnace maintenance is the best way to avoid a costly emergency HVAC repair. “Why Is My Heat Pump Blowing Out Cold Air in Heating Mode?” December 23, 2020 by SLMP Admin While heat pumps may still be a long way from fully replacing traditional heating and air conditioning units , a growing number of homeowners are choosing to install these systems in … If you continue to have problems associated with duct leakage or your furnace blowing cold air, an HVAC professional can provide a more sophisticated analysis and duct sealing options for ducts that are not easily accessible. It is a tiny flame that is always running and is needed so that the furnace burner is lit. 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. Older furnaces might blow cold air if the pilot light has gone out. Those who have any heating system in their home should know that their design needs to be serviced. Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. It’s possible your furnace overheated. Have an expert inspect your ducts along with the furnace. It makes a flash, which ignites the burners, which spares the pilot light from being on consistently. We deal in all kinds of HVAC repair and installation services. Many do not go to the attic if it is not necessary or doesn’t know how to cope in the attic, as it is possible to fall through the attic or make holes in the attic floor. Either of these would be a clue that a malfunctioning flame sensor could be causing your furnace to shut down. User account menu • Furnace Blowing Cold Air! The excess dust will be removed after about a year. Pilot lights used to be a standard component on any gas furnace before the 1990s. It is usual for cold air to enter the heating system until it is warm, and then for warm air … 10 Common Reasons Why Your Furnace is Blowing a Cold Air Read More » Is the fan set to run constantly, even when the system isn’t heating the air? The flame sensor’s job, as its name suggests, is to detect a flame from the burner. If the temperature in your home is cooler than the temperature you set on your thermostat, or if you hear your furnace start up and shut down quickly over and over, you might suspect a flame sensor has malfunctioned. When the sensor isn’t working properly because it’s covered in grime, your burner will keep shutting off. If a thermostat is set incorrectly, you might notice your furnace blowing cold air from the heat registers, a lower than expected temperature reading on the thermostat, or you may even hear your air conditioner running outside. The switch is in the house it to overheat a few vents, try closing fewer vents this time delay! 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