Settings. A dirty sensor can be simply cleaned by your local Carrier dealer for an inexpensive repair. Because a pilot light is designed to burn continuously, it also uses more of your gas supply, which can be reflected in higher utility bills. The furnace blowing cold air, or there is no heat in the house. 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. 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. If cleaning or replacing the filter doesn’t solve the problem, it’s probably best to contact your local HVAC professional to diagnose the issue. As your heating system ages, grime and debris may build up—causing your furnace to blow cold air. A Guide to Why Your Furnace Is Blowing Cold Air. 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 » Furnaces can overheat for a variety of reasons, including: Before you hit the panic button thinking your trusty old gas furnace has picked a terrible time to go into hibernation, there are some legitimate reasons why normally functioning furnaces can give you the cold shoulder. Turning off the battery can be one way to solve the cold air problem, and it may be evident that the question arises if any new signs or signals appear on the thermostat and have never been seen before. 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. Later on, please make sure to check your channel and change it as regularly varying. If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. It is a tiny flame that is always running and is needed so that the furnace burner is lit. We can also help you with annual maintenance and installation. Here are some of the common and uncommon reasons we see furnaces blowing cold air. The excess dust will be removed after about a year. Close • Posted by 1 minute ago. Air filters or air handling units such as boilers, heat recovery ventilator, and ERV systems are intended to clean and, In Canada, winter lasts almost six months or more, and because the price of energy goes up every year, Canadians are now excessively insulating their. The air filtration system is designed not only to filter the air in the house but also to protect your system against dust build-up. It’s possible your furnace overheated. If you can see the burner in your furnace, you may be able to visually inspect the flame sensor for cracks in its porcelain base, or soot build up on its tip. 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. 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. It makes a flash, which ignites the burners, which spares the pilot light from being on consistently. Pilot lights used to be a standard component on any gas furnace before the 1990s. As soon as the furnace cycles back on the air will warm up again. If this channel becomes obstructed, your furnace may keep your burners from lighting. Have you ever turned on your heat after turning it off for months, only to find that cold air was blowing because you still have it on the cold air setting? You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. Try opening all of your heat vents and see if that solves the problem. If you have a gas furnace, a lack of fuel will cause the pilot light to go out. 0 comments . Check to ensure your gas flexibly is turned in the on position (equal/by the gas gracefully pipe. Furnaces use an indoor fan to push hot air through your air ducts and into your home. If your furnace blows hot air, then cold air, and then stops blowing any air, this could be a possible sign that your furnace has overheated. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. 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. Incorrect thermostat settings... a wave of cool air from your heat vent before the warm air arrives... and cool air circulating through the house because the constant fan setting is set to run when the furnace isn’t actively heating... these are all common reasons for a heating system blowing cold air. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. The blower keeps blowing to cool the furnace down to a safe level. The average homeowner can often make simple repairs by straightening sheet metal and securing sheet metal joints with screws, or by using an appropriately rated tape product or sealant. User account menu • Furnace Blowing Cold Air! 7 Possible Reasons Your Home Heater/Furnace Is Blowing Cold Air. 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. The most widely recognized reason for this issue is steady overheating, usually brought about by clogged channels. The fan limit switch measures the air temperature inside the furnace or hot air supply plenum and controls blower motor operation. To be noted, there is a conflicting, What is a Furnace Filter? Furnace still blowing cold air? A furnace that isn’t getting fuel will not ignite and will blow only cold air. The low battery can register incorrect temperature inputs on the thermostat, which may very well be the cause of the cold air problem. Note that the filter needs to be replaced more frequently in new construction due to interior finishing work while the system is in operation. If your furnace is still blowing cold air, it sounds like you’re going to need some professional help to get things working. 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. Depending upon the age, condition and quality of the construction, your home’s ductwork may have some significant leakage. We strive to provide the best service possible for our clients. There may be some problems with it, mostly if it has not been set correctly. Furnace blowing Cold Air: Your furnace may be blowing cold air because the filter is too dirty. 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. Our technicians will take care of your furnace. 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. Keep reading to learn more about why your heating system is blowing cold air and what to do next: Cold Air From Thermostat Issues . 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. Its responsibility is to eliminate water that is made during the warming cycle. If your heater starts by throwing warm air out of your registers, but you are soon left with a heater blowing cold air, then I would suspect that your flame sensor needs to be cleaned. 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. If you notice the air temperature in your home is cooler than normal... if the airflow from your heat vents seems to be weaker than usual... and/or if you hear the furnace running for short periods of time before shutting down (short cycling), you may have a dirty air filter to blame. 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. Your furnace might be running just fine, but the air blowing out of your vents feels cold. Start by checking that your thermostat is set properly. though several reasons can cause this problem, there are a few things you can do before you call a professional. When the furnace starts heating, the fan limit switch waits until the air reaches a predetermined temperature before turning on the fan to blow warm air into the home. If you still suspect the problem is a dirty air filter, consult your owner’s manual for instructions on removing and cleaning or replacing your air filter. New high proficiency furnaces have what is known as a condensate pump. 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. Check your air filter, and clean or replace if needed. Some will continue to use their system year after year without worrying about maintenance, and when the system fails, that’s when they realize care is a problem. Regular maintenance… A Final Word on Your Heating System. This short delay is intended to keep you more comfortable by eliminating an initial blast of cold air from your heat vents. Boiler vs. Water Heater: What is the difference? When your pilot light is out, an otherwise perfectly functioning furnace will not provide heat for your home. This can be caused by something as simple as a strong draft. 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. 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. How to Maintain and Service Your Home Furnace, HVAC Education, Buying Tips, Furnaces, Heat Pumps, Technology, HVAC Education, Buying Tips, Furnaces, Technology. In extreme cases, an overheating furnace can cause damage to internal components such as a heat exchanger. On the first cold day of the year, you eagerly turn on the heat and find the furnace is blowing cold air. 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. There are a lot of options when it comes to thermostats, but they all control both heating and cooling. Details. So make sure that gas is supplying the furnace. Learn how to choose and maintain your HVAC system. Before checking your furnace filter, be sure the thermostat is set for heating and that the temperature setting is correct. Your furnace’s fan will run persistently because as far as a possible switch is no longer working or is almost dead. An electric ignitor doesn’t need a pilot light and would act fundamentally like a gas burner. Ensure the blower is set to “AUTO,” which will permit the kettle to control the blower. You hear your furnace kick on... but there is no airflow or you find the furnace blowing cold air. A dirty furnace air filter is often the culprit of an overheating furnace. If your furnace seems to be blowing cold air, it could be a problem with the ignition system. Check Your Air Filter. Those checking the ducts should look for a hole or a crack in the ducts, as this can be the cause of a leak causing cold air to flow through the radiator. Have an expert inspect your ducts along with the furnace. Pilot lights used to be a standard component on any gas furnace before the 1990s. If this is the case, you may also see an error message on your thermostat, or a flashing LED light on the furnace control board. 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. Is there a worse time for your furnace to start blowing cold air in your Georgetown home than on a cold winter night? If the fan is set to ON, it will blow air consistently. Note that cleaning of the ventilation ducts may be required. 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 longer you run a broken furnace, the greater your chances of inflicting permanent or serious damage. The first thing you have to do is check to see what type system you own. All you have to do is switch the thermostat to the AUTO position. The furnace blowing cold air, or there is no heat in the house. It's also possible that the furnace's pilot light isn't well shielded. This is a common problem with homes in the United States. The thermostat is the first place to check when the furnace is blowing only cold air. However, this occurs more often than people think and can result from a plethora of different issues. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. Lack of maintenance can lead to build-up of dirt, dust and other airborne pollutants that can clog your filter, restrict airflow and lead to both discomfort or in more extreme cases, system failure. Heating of water can be done through two specified methods: using a boiler and using a water heater. If it is, simply re-set the thermostat for heating, or change the setting to auto so it will automatically change between heating and cooling as temperatures change. If you suspect your furnace is overheating, it will start blowing cool air to lower the temperature to a safe level. A new furnace can offer higher energy efficiency, new product reliability and warranties, and no issues with pilot lights blowing out. There are two different system types: forced air duct systems that push warm air with the aid of a blower into the system and vents, and gravity furnace systems that use convection currents to circulate the warm air. The “on” option is exactly how it sounds. If your Oil Furnace is Still Blowing Cold Air, Check Your Flame Sensor. If cleaning or replacing the filter doesn’t solve the problem, contact your local Carrier dealer for assistance. Your thermostat has an ON and AUTO switch that runs your blower. One of the main culprits of cold airflow is an improperly set thermostat. 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. If your furnace starts blowing warm but then quickly turns cold, the flame sensor may need attention. 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. Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position. By : Capital; Furnace Repair; Comment: 0; As the winter season rolls around, homeowners kick their furnaces into full gear to keep low temperatures from penetrating interior spaces. Although not an issue for natural gas customers, if you use heating oil, it’s best to check the fuel level. And, if your furnace does have a pilot light ignition, it may be time to consider upgrading to a new, pilotless gas furnace. If so, your system may be circulating cooler air between heating cycles. The most common type is the furnace or heat pump, which is generally connected to a ducted air system. However, furnaces are “sized” to efficiently deliver comfort to the entire home. If this is happening to you, it’s helpful to know why this could be occurring and what you can do to troubleshoot the problem so you aren’t left freezing in your Texas home. If, after a few minutes you still experience the furnace blowing cold air, you may need to contact your HVAC contractor. Press question mark to learn the rest of the keyboard shortcuts. This operation must be carried out every year by a professional heating engineer. If you have a programmable thermostat, review your “comfort schedule” for any issues, and make sure your programmed settings haven’t shifted times due to daylight savings time. Your furnace may be blowing cold air because the filter is too dirty. 2) Furnace overheated Let’s say your furnace blows hot air, then cold air, but then stops blowing any air at all after a while. “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 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. Check Your Oil Filter. 2. One of the last places people think about is the ductwork, which is in the attic. Do this: Turn off your furnace at the thermostat, and check the furnace filter. Or, it may prevent the furnace from operating at all. 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