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My furnace is blowing cold air when the heat is on

my furnace is blowing cold air when the heat is on When a heating cycle begins and your air handler turns on, that cool air will blow out of your registers before warm air does. The compromised airflow causes the furnace to overheat, shutting down its burner. Your furnace blowing cold air could ultimately derive from a cracked heat exchanger. When you first turn on the furnace, it’s common for it to blow a blast of cool air. If the burner is not running, newer furnaces will attempt to light a few times before they ?lock out?. If you find that cold air is blowing out of your vents try turning the unit off and on. Common Causes for Cold Air Coming from Your Vents: Thermostat issues. You can try changing your air filters and restarting your furnace. If your furnace appears to be working, but the air is still coming out cold, it’s probably because the heat is escaping before the air can come out of your vents. A dirty flame sensor. If your furnace overheats, it could end up blowing cold air. If so, the limit switch, a featured safety device, probably turned the burners off. Q: Help! My furnace is running, but the heat is not turning on. In such cases, a safety control device known as the limit switch will shut off the burners. 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. . A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Infinity Texas Air prides itself on its customer service capabilities. Malfunctioning Flame Sensor in Furnace. 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. Your furnace could be blowing cold air when it first turns on because of a problem with the blower motor. This can be aggravating, but there are a few ways to pinpoint why your heater is functioning more like an air conditioner. A home . To . One of the most important differences between heat pumps and furnaces is that the latter blows hot air from burning fuel, therefore great heat is emanated at the furnace itself. It May Be Blowing Relatively Cooler Air. Do this: Regularly replace your air filter. This is not something to ignore as it can cause serious (read: expensive) malfunctions to other parts of the system such as the heat exchanger. 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. Changing set points on limit switch does not seem to change pattern. J. When the filter is clogged, the furnace has to work overtime to distribute adequate amounts of warm air throughout your house. Restricted airflow can cause your furnace to run longer to heat your home until it overheats. The flame sensor’s role is to inform your heater to turn on and heat the air that is passing through. If your furnace is blowing cold air or experiencing other issues, contact Forney Air for expert help. Your furnace may be blowing cold air because the filter is too dirty. Sometimes, the heat exchanger can get too hot and overheat. Furnace Repair in Chicago, IL. Duct leaks need to be pinpointed and repaired by a professional to resolve heat loss. Why Is My Furnace Blowing Cold Air? The reasons for cold air can vary, and you will need to observe the circumstances related to the issue. The reason cold air will continue to blow while the furnace is on and the thermostat is set correctly is because the fan assumes that heat is being generated by the furnace even?if the burner is not running. Empty fuel tank. This “hot then cold air” sequence happens over and over and your home isn’t warming up. A dirty air filter can cause cold air to come from your heater because it can make the furnace overheat. Whether the problem is easy to repair or not, we will work hard to get warm air circulating through your house as fast as possible. Your temperature settings could be another culprit if the temperature is set too high. If your furnace starts blowing warm air before turning cold, that could be a sign that your burner is shutting off because of the flame sensor. Check your thermostat’s fan setting, and if it is set to ON, switch it to AUTO. Your furnace may be blowing cold air because the pilot light has gone out. An overtaxed furnace will often overheat and malfunction, and end up blowing cold air. If it does overheat, the safety control will shut off the burners, causing the fan to blow cool air through the house versus heated air. If the air feels warm for a moment or two, then switches to cold, it may be that the flame sensor is dirty. To fix this, turn off the power to your furnace first. If your furnace or heating system all of the sudden starts blowing cold air through the vents, it’s a cause for concern and something you’ll want to address right away. Change the air filter. The list of potential problems only grows from there — a faulty burner, filthy air filter and more. If you’ve got cold air blowing out of your vents when the heat is on, check out this guide, and follow the steps to diagnose, and potentially fix the problem. If that doesn’t work, consider calling a professional to . The fan will still run in your furnace, kicking out cold air. It seems counter-intuitive but yes, your furnace can actually overheat. This sensor determines if the burner is producing heat and helps with heating the air as it moves through the HVAC system. This might mean that your flame sensor just needs to be cleaned before your furnace can function properly again, or the sensor might need to be replaced. Then, you can make the decision that’s best for you. The team at B&B Heat and Air Conditioning in Grove, OK, has a staff that is experienced in maintaining . It can also overheat your furnace and shut down the automatic heating cycle so you feel cold air blowing from your vents. Even if it does not look overly dirty, there may be a clog within the filtering material. 5 to 3 minutes after the furnace has ignited and started to heat your home’s air. Also, if your thermostat is battery powered, make sure the batteries . Make sure your furnace is set to “heat” and not just a fan setting. Overheating will almost always occur due to restricted airflow, and this is . However, the fan will keep running, cooling the furnace to protect it from potential damage. If your furnace still blows in cold air after trying out the above suggestions, seek professional help from C & C Heating & Air Conditioning. C. With a dirty flame sensor, your gas burner won’t stay lit, causing the air to go cold soon after the furnace turns on. If you feel your furnace is blowing hot air at times and cold air other times, check to see if your fan is set to ON – when it should be set to AUTO. In some cases, it may need professional service in order to function correctly. Then, switch it back to “PILOT,” light the pilot . Sometimes, a furnace blows cold air due to duct leaks. It can also stop the burners from igniting. Systems, Inc. You may be out of fuel if your furnace runs on heating oil or propane. We offer furnace repair and maintenance throughout the Chicago area, and our talented technicians can handle any furnace problem you may encounter. If your furnace is blowing cold air and the filter is dirty, the temperature rises inside the furnace causing the limit switch to shut the heating cycle down if the unit becomes too hot. 402. 3. When heat called for and fan comes on it blows cold air, then heat, then cold, then off. A Furnace Blowing Cold Air Needs Attention. Once you’ve restored it to the correct setting, your heat pump or furnace should blow warm air only. #1: The furnace isn’t fully warmed up. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. It has always done this. This will signal the furnace to shut off more quickly than it should. By the time the furnace air gets to your room, it won’t be as hot as it was when it was first exiting the furnace. Your furnace actually heats air via a part of the furnace called the heat exchanger. You can use the above information to determine the reason behind a furnace blowing cold air. If replacing the batteries doesn’t help, give J. Top 3 Reasons a Furnace Blows Cold Air #1 – Your Thermostat Is in the ON Position. A. When your furnace blows cold air, try turning the heating unit off and on. Then, turn the pilot light to “OFF” and wait for 10-20 minutes for any gas to clear the area. But if the blower is turning on prematurely, then it may be pushing cold air into your home before it’s had a chance to be . Wait a few minutes for the furnace to get going. Once airflow to the furnace is no longer blocked, your furnace will be less likely to overheat and should function normally. Limit switch is at off 100, on 125 off 150. 2) Your f ur nace has overheated If the furnace is blowing warm air but then starts to blow cold air and then it actually stops running altogether for a period of time: The reason cold air will continue to blow while the furnace is on and the thermostat is set correctly is because the fan assumes that heat is being generated by the furnace even?if the burner is not running. When a furnace blows in cold air, it could be because of one of the above issues. One of the main culprits for a poorly running heating system is a dirty air filter. If there are holes in the ducts in your house , heat energy will escape. 2. There are two key settings that can make your furnace blow cold air: The temperature setting; The fan setting; The temperature setting: During the winter, your furnace needs to be set to heat. Check your thermostat. In this case, you’ll need to get work done on your HVAC ducts. The fan will keep blowing for a period after the furnace shuts off to dissipate the heat. Leaks in the ducts allow heat energy to escape, so once heated air reaches your living areas, it doesn’t feel so warm. In other words, there are holes in your ducts that allow hot air to get out. It is very random, happening now 3 times in . If your furnace is blowing cold air, you’ll need a trustworthy and competent technician. A heat exchanger is a group of metal coils that are heated. If it’s blowing hot air, then cold air, and finally stops working altogether, the limit switch has probably turned the furnace off. The pilot light is out. Your furnace gets a long summer vacation from heating duties, but once winter is on its way, it better be blowing warm air! Have you turned on your furnace just to find cold air is blowing out of the vents when the heat is on? As frustrating as this may be, the answer may be a simple fix. But the fan continues to run, cooling the furnace to a safe level. Furnaces can overheat for a variety of reasons, including: The pilot light is out. 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. 4. If your furnace blowing cold air instead of heat, it could have overheated. If it continues to go out after you relight it a few times, then you should call us at 513-474-1600 or request service online . It restricts the airflow in and out of your furnace, which can cause this issue. 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. If your thermostat is not working properly or is on the wrong setting, it can fail to call for heat and simply blow cold air. That’s because the cooler air needs to come through the vents. If the furnace's heat exchanger is cracked, then your household is at immediate risk of Carbon Monoxide poisoning. A dirty air filter blocks airflow over the furnace's heat exchanger, causing it to overheat. When the cold wind starts to howl, you may hurry to your furnace … only to find that it’s blowing chilly air throughout your home. When your furnace overheats, you will only get cold air. You can prevent most furnace problems by scheduling regular maintenance. Furnace operating problem. But if the furnace never reached the proper temperature, it will just circulate cold air. Sometimes, the cause could be as simple as a faulty thermostat. As soon as the furnace cycles back on the air will warm up again. If your furnace is blowing cold air, don’t panic. Forney Air serves homeowners and businesses with top HVAC technicians. It is important to mention that one reason the main limit can overheat is due to a cracked heat exchanger. Once it is all booted up, then judge the temperature of the air. This is a common problem and one of the first things that you should check if your furnace is blowing cool air. When air blows over the coils, the air picks up that heat. A dirty furnace filter is the root cause of many problems. Hopefully, your furnace is blowing cold air for an easy-to-fix reason. If the system continues to blow cold air, there could be a deeper issue with the thermostat itself, or another component of the heating system. 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. If it’s dirty, it may not determine if your burners are on. It often takes a few minutes for the air to feel warm. Most furnaces have a built-in safety feature that turns the burners off when the furnace gets overheated, but the blower will stay on to cool the furnace to a safe level. If your furnace blows hot air, then cool air, but then stops blowing air all-together is a tell-tale sign of overheating. 4456 It restricts the airflow in and out of your furnace, which can cause this issue. 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. Call 888-868-6667 today or contact us online to schedule . A home furnace, heat pump, or heater blowing cold air isn’t necessarily a reason to panic. It is a simple fix, just relight the pilot. An overheated furnace usually happens when you don’t change the air filters, and it can result in cold air blowing from a furnace. When your thermostat is set to ON, it means the furnace blower (the fan that blows warm air into your home) is running continuously…even when the burners are not running. Check the Pilot Light. My furnace is blowing cold air when the heat is on, however this is random. A dirty air filter is the most common cause of overheating since it blocks airflow. Your thermostat has an ON and AUTO switch that runs your blower. For example, if the system is turning on for the first time on a cold day, you might feel a blast of cold air as the supply in the ducts moves through the house. My Furnace Is Blowing Cold Air” During a cold winter day, this is a very annoying problem to have. When your furnace isn’t running, the air in your ducts cools down. If changing the furnace filter is not a part of your regular maintenance . If the furnace in your home is blowing cold air, give us a call by phone at (703) 543-9649 or fill out our Service Request Form to receive assistance. Get to The Bottom Of Your Furnace Needs With Our Trusted HVAC Professionals. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. Here are 7 possible causes, and only some cost money to fix Ph: 425. I flip the power switch on the furnace, which seems to reset the issue. The Reason Your Heat Pump Is Blowing Cold Air If you’re reading this and you have a heat pump , there’s good news—contrary to what you might fear, this is likely normal heat pump operation! Heat pumps transfer heat from one location to another—they don’t create it like a furnace does. While it might seem alarming that your furnace is blowing cold air, there are a few common reasons why. If the switch is in the ON position, then the blower keeps running, even when the furnace is not heating. We offer furnace repair and installation services in areas of Virginia such as Arlington, Reston, Alexandria, and Centreville. Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. This will lead to heat blowing out cold air. Even if the screen on your thermostat is working, your thermostat may have low batteries or a bad connection to the furnace. It’s a simple fix; just . If when you turn it back on the air is warm for a minute and then changes to cold air you might have a dirty flame sensor. If it continues to go out after you relight it a few times, then you should call us at 704-545-2000 or request service online. If it's not, it will likely not turn on often, and when it does it . When a furnace overheats, safety sensors kick in and turn it off and then blow cold air to cool your furnace. A professional heating technician has the equipment to detect areas leaking heat. Reliable Furnace Repair & Installation Services. Your furnace may be blowing cold air because the thermostat is on the wrong settings. Having holes in your air ducts could be a more serious reason as to why your furnace is blowing cold air. If the furnace overheats, the limit switch will shut the furnace down. 4 – Leaking HVAC Ducts. The solution is to replace your dirty air filter with a clean one. You can then seal and insulate the ducts to reduce excessive heat transfer. Quality Furnace Care. Some things are an easy fix like changing the air filter, but others require a trained and qualified heat and air professional. Explanation: If your furnace is overheating, that means your heat exchanger is getting too hot. This happens because airflow is restricted, which forces the furnace to run for longer leading it to overheat and blow out cold air. If your furnace is blowing cold air, our team at ABC Plumbing, Sewer, Heating, Cooling and Electric can help. Clogged air filters could be causing cold air to blow out of your vents. Why is my furnace blowing cold air? A: If the home’s heater is not working, it’s crucial to address the issue quickly. The top three reasons why a furnace might be blowing cold air instead of warm are include: The Thermostat is set to ‘ON’: ask any professional heating repair man what the first item they check when they are on a heating repair call and most of them will reply ‘the thermostat’. The furnace needs to blow the cold air out of your vents before it can start circulating warm air into the home. It may seem obvious, but thermostat settings are often the culprit of heaters blowing cold air. This will cause the constant blowing of cold air to cease and your furnace will only blow warm air whenever it is prompted to run. Replace a dirty filter with a clean filter, give the furnace a chance to cool down and reset, then try again to increase the heat temperature on your thermostat, and feel your vents to see if warm air is blowing. If you’re looking for some winter furnace maintenance, check out our post on the subject. I go down to the furnace, and the pilot is lit, the thermostat is set to heat, but blows cold air. My pilot light is on throughout the blowing process. If you notice cool air blowing and/or your furnace frequently turning off, a simple air filter replacement may do the trick. If this is the cause of your furnace problem, your furnace will blow warm air, then cold air, and eventually stop blowing air all together. Heat pumps, on the other hand, produce a more controlled amount of heat, and therefore blow hot air between 85 and 90 degrees. Agnello Heating & Air Conditioning Inc a call so . The knowledgeable staff at Forney air is there for all of your HVAC maintenance needs as well as 24/7 emergency service for added peace of mind. You can always depend on one from B. Dirty Air Filter. Normally, the blower turns on 1. my furnace is blowing cold air when the heat is on