furnace blowing cold air sometimes

The Flame Sensor is Dirty. So Why Is My Furnace Blowing Cold Air Instead Of Heat? Clogged air filters could be causing cold air to blow out of your vents. If you have any questions about why your furnace is blowing cold air, or if you’d like a heating system serviced or installed in your home, contact Cabrillo, your Bay Area plumbing, heating and air conditioning contractor. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. Maintenance issues again here: if you have a gas furnace that hasn’t been cleaned in a long time, a faulty valve could be the reason for the cold air blowing out of your furnace. If neither your thermostat or your air filter seems to be the issue, there may be a bigger problem at hand. This is another reason to have your system checked regularly. Privacy Policy. If you think this might be a mistake, feel free to contact us and we can confirm. Viewed 3k times 0. You might be able to tell if your ducts have a leak, but fixing them is another issue. Check The Thermostat. The hot and cold air pattern might happen for an extended period, and still, your house remains cold. That could explain why you feel cool air coming from your vents every once in a while. If they’re not, try changing the batteries. This field is for validation purposes and should be left unchanged. Ensure that your thermostat is set higher than the temperature in your home. Bay Area plumbing, heating and air conditioning contractor. Older furnaces have a pilot light, while most newer furnaces have an electronic ignition system. Does your furnace blow hot air sometimes and cold air other times? Sometimes, the heat exchanger can get too hot and overheat. Ring us at (732) 681-9090 or schedule an appointment online to have one of our techs come diagnose what’s wrong with your furnace. A dirty air filter can block airflow over your furnace’s heat exchanger, which can cause it to overheat. Leaks in the ducts allow heat energy to escape, so once heated air reaches your living areas, it doesn’t feel so warm. Gas furnace. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. If your heater is blowing cold air, and it’s not one of the first two possible explanations on this list, then you’ll need a specialist to at least come and take a look. Your gas supply could be turned off. Leaky air ducts can also make your furnace work harder as it strives to meet your desired temperature that’s set on your thermostat. A furnace that isn’t getting fuel will not ignite and will blow only cold air. Is the furnace’s blower constantly running? If you have a gas furnace, a lack of fuel will cause the pilot light to go out. People get confused, and sometimes even scared when this happens. 78 Dorman Ave San Francisco, CA 94124 United States This time of year, especially when it gets cold outside in the evenings, we get many calls from homeowners concerned that there is cold air blowing out of the duct registers in their home when their heat is running. Pilotless ignition furnaces use a flame sensor to keep the furnace burning once it starts. While it sounds counterintuitive, an overheating furnace can actually produce cool air rather than warm air. If... Condensate clog. Another noise is when you hear the furnace blower running excessively. A weak power source won’t trigger the sail switch, and it won’t regulate the air flow. You may also see an error message on your thermostat, or a blinking LED light on the furnace control board. For Furnace … Do this: Try relighting the pilot light following these steps: Step 1: Turn off your furnace Make sure the thermostat’s screen is on and the buttons are responsive. Click here for a guide on how to fix this problem. When it’s cold outside, the last thing you want to find is cold air coming out of your furnace when it’s supposed to be heating your home. Cold air problems that require professional repair Overheating furnace. When you turn on a faucet to receive hot water, you often have to wait a bit... 2. Does your blower turn on & off frequently or does it blow cold air sometimes? In most cases, it’s best to have a professional identify the problem and repair your furnace. Another reason your furnace might blow cold air is if the electronic control panel is broken. How have you & your family been feeling? When set to ON, your furnace will deliver air 24/7, even in between heating cycles. So 85-92°F feels cold to new heat pump owners. A dirty air filter is a common culprit of furnaces blowing cold air. Sometimes, a furnace blows cold air due to duct leaks. Furnaces can overheat for a variety of reasons, including: If you’ve already checked your air filter and you know it’s not the source of the problem, you’ll need to contact a professional for a furnace inspection.. Without combustion, you won’t have heat. If this is the case, we may have solved your problem. While it sounds counterintuitive, an overheating furnace can actually produce cool air rather than... A faulty ignition system. Alexandria, VA 22312 Map | (800) 948-6453, © Michael & Son Services Inc. 2003–2021. 5 reasons why your furnace might start bowing cold air 1. Two thermostat issues that could cause your furnace to blow cold air include: Your thermostat is still set to COOL not HEAT Your thermostat fan setting is set to ON not AUTO Once again, the low battery voltage can be the issue here, so the best thing to do is to replace the battery. If your furnace is blowing cold air, or is not operating at all, a component called the fan limit switch may have malfunctioned. Schedule service Troubleshooting tip #1: Check the thermostat If your furnace blows hot air sometimes and cool air at other times, … 5740 General Washington Dr If you have leaks or holes in your air ducts, warm air can easily escape which could explain why you’re feeling cool air coming from your furnace instead of heat. 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 your furnace seems to be blowing cold air, it could be a problem with the ignition system. When the weather turns especially cold—as has been the case this year in Sacramento and much of Northern California—we often get calls from customers reporting that their heat pump-powered heating systems are blowing cold air through the vents, no matter how high they turn the thermostat. When it’s set to AUTO, the fan will only run when the furnace is actually producing heat. In such cases, a safety control device known as the limit switch will shut off the burners. When the air filter is dirty, airflow through the system is restricted and the furnace may not be heating the air. It’s Just Been Switched On – Any furnace will blow cold air when it starts up, since it takes time for hot air to travel through the system and into your home. Again using Occam’s Razor, we can assume that the next likely culprit for your heater blowing cold air is your thermostat. A professional can check the limit switch to make sure it’s working correctly. When your thermostat is set to ON, the fan will run continuously even when your furnace isn’t producing heat. So when the furnace isn’t heating that air, it will come out the vents as lukewarm or cold. Incorrect thermostat setting. If you have an older furnace and your pilot light is unable to stay lit, the ignitor won’t light the burner and there will be no combustion. 1) Thermostat is set to ON Is your furnace blowing cold air only sometimes? But as it turns out, this is a furnace problem that comes up often in many Bay Area homes. Dirt and debris can collect on the valve, causing it to shut down. It’s the beginning of a heating cycle. After you check your thermostat, it’s time to check your air filter. Today we’re going to talk about five reasons why your furnace might start blowing cold air in your home so that you can properly take care of the issue if it happens to you! Have you cranked up your thermostat to knock the chill down only to discover that your heater is blowing out cold air. Cold air trapped inside will need to be expelled before the hot air can take its place! Ask Question Asked 6 years, 5 months ago. One of the most common causes of a furnace blowing cold air is not actually a repair at all. Maybe the sensor that turns the fan off is not working and allows the fan to continue blowing too long. When air blows over the coils, the air picks up that heat. All Rights Reserved. But first, we’ll share a couple of fixes you can try at home before you call a pro. Possible Conclusion 1: It’s … When the filter is clogged, the furnace has to work overtime to distribute adequate amounts of warm air throughout your house. If your furnace starts to run properly after the filter is changed, you’ve solved the problem. 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.. Or the gas line isn’t supplying enough gas to your furnace. Your Furnace Air Filter is Dirty After making sure your thermostat is set to HEAT, make sure the fan is set to AUTO and not ON. New furnaces are equipped with a spark ignitor or electronic ignition, which may require a technician to repair. Your furnace actually heats air via a part of the furnace called the heat exchanger. New high efficiency furnaces have what is known as a condensate … If your furnace overheats, it could end up blowing cold air. 415-821-0560 | Duct leaks need to be pinpointed and repaired by a professional to resolve heat loss. A dirty furnace filter is the root cause of many problems. Your furnace is overheating if it blows hot air, then cold air, and turns off. 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. Michael & Son Services (Corporate Headquarters) We're sorry, but it looks like we don't offer service to this zip code. Sometimes a thermostat can accidentally get switched to the incorrect setting without the homeowner realizing it. If the flame sensor is dirty, your furnace will turn on and begin heating but then turn cold … By switching the thermostat to “auto,” the fan will only blow when the furnace is heating the air. There are two possible routes here, one of which many homeowners who are new to heat pump systems encounter. Or, the valve could simply be worn out. Your furnace’s fan is controlled by a limit switch which tells it when to turn on and off. 2. Below are some reasons you may be getting a blast of chilly air and how you can warm up your house as soon 1as possible. Unfortunately, this is not a problem you can fix on your own. Most furnaces have safety features that will automatically shut off the burners when it senses the furnace is overheating. It’s important to have a professional do cleaning and maintenance on your furnace annually, to ensure that the problems you may come to face are minimal. Other thermostat issues. Reason #3: Overheated furnace. If so, this is a sign that your furnace may need to be replaced. Terms and Conditions | Privacy Policy | Sitemap Sometimes snow, ice or other debris can clog the system and either shut your system down or force it to blow cold air. Electric resistance heating, which use heat strips (standard with every heat pump) installed in your ductwork. But, the air coming out of the vents can feel cold for a couple reasons: Gas furnaces produce air that is 130-140°F range. This issue can be resolved sometimes simply by turning off your furnace and resetting the system. Why is my new high efficiency furnace blowing cold air sometimes? An overtaxed furnace will often overheat and malfunction, and end up blowing cold air. Active 2 years, 7 months ago. With electronic ignition systems, cold air could be caused by an electrical issue or if parts need to be 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. When it’s operating properly, the switch will turn on after the burners have completely warmed up the air and blown it across the heat exchanger, so only warm air is being blown into your home. VA Master Plumber/Gas Fitter #2710019013 • VA Class A Contractor #2701038423 • MD Master Plumber/Gas Fitter #82253 • MD Home Improvement #123872 • MD Master Electrical #3952 • MD Master HVAC #65489 • DC General Contractor #420211002808 • DC Master Electrical #EM900824 • DC Master HVAC #RC 901906 • DC Master Plumber/Gas Fitter #PGM10542 • WSSC Master Plumber/Gas Fitter #PFG 73421. The type of ignition system in your furnace will depend on the furnace’s age and manufacturer. 7. After all, a furnace shouldn’t be blowing cold air, right? Your thermostat’s fan setting. Called a “dual-fuel system”, the gas furnace kicks on when the heat pump can no longer efficiently pull heat from the cold air outside. Design and Marketing by LeadsNearby. Blowing Cold Air. When your heat pump sometimes blows cold air even when the setting for heat is on, it’s an alarming problem and depending on the cause, a common enough one. If a reset does not correct the issue, calling a qualified HVAC specialist to repair your panel is your next best option. Thermostat: A Furnace Blowing Cold Air Could be Due to Your Thermostat. If it’s not, they can replace it. Well this happens sometimes and a few things can be the cause. Here are some possible reasons your furnace is blowing cold air: We’ll explain what can cause these four issues in greater detail and why it’s best for a professional to handle the repair. Otherwise your electric heater or gas furnace will not turn on. The problem may be the thermostat fan setting. Your body temperature is around 98.6°F (everyone’s body temperature is slightly different, but that’s the average). Here are 6 common reasons for a furnace blowing cold air, and what you should do about it: 1. Page top photo: Watch out: a return air inlet close to a gas heating furnace may be unsafe - see UNSAFE DUCT OPENINGS for details. A dirty air filter will restrict airflow to your furnace and can cause it to overheat. However, the fan will keep running, cooling the furnace to protect it from potential damage. A furnace technician can inspect the ignition system to find and repair any issues. Our NATE-certified technicians are available for same-day emergency furnace repairs. If the thermostat isn’t responsive, call a professional. This type of heating is highly inefficient. Double-check that your thermostat is set to HEAT and not COOL. A heat exchanger is a group of metal coils that are heated. 1 When the thermostat stops calling for heat, the furnace will turn the electric heating coils off, but allow the fan to continue blowing air until the coils cool down. The type of ignition system in your furnace will depend on the furnace’s age and manufacturer. Turn your thermostat from HEAT to OFF. This can be caused by something as simple as a strong draft. 13 reasons your furnace is blowing cold air 1. When the furnace overheats, the heat exchanger becomes abnormally hot. If your furnace is blowing cold air, give us a call today! If your air filter is dirty, replace it ASAP. Inadequate gas supply. Call a professional so they can do an inspection and identify and repair any leaks. 1.Your Heater hasn’t had time to warm up. If so, someone may have been too... 2. Cabrillo Plumbing, Heating and Cooling ©document.write(new Date().getFullYear()) | All Rights Reserved | Do you have thermostat wars going on in your office? So if you’re experiencing furnace issues, give us a call. If the limit switch is broken or not operating properly, the fan can turn on too soon, which can cause cool air to blow out of your vents. This causes the system to overheat, and your furnace trips its limit switch because internal temperatures are too high. Your furnace is supposed to heat your home, so the last thing you’d expect is to feel cold air coming from your home’s air registers when your system is running. To the most common causes of a heating cycle panel is your next option! Vents every once in a while and will blow only cold air could be a mistake, feel to! Be adjusted or replaced, one of the furnace has to work overtime to distribute adequate amounts of warm.. Not working and allows the fan will keep running, cooling the furnace isn ’ t heat! You cranked up your thermostat is set higher than the temperature in your office can... 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Inspect the ignition system in your ductwork called the heat exchanger is a group of metal coils that are.! Fixes you can try at home before you call a professional to resolve loss. A furnace problem that furnace blowing cold air sometimes up often in many Bay Area homes have a gas furnace deliver! Cranked up your thermostat is set to AUTO and not cool it will come out the as. Furnace … if your furnace will often overheat and malfunction, and still, your is. Amounts of warm air throughout your house remains cold have heat problem you can try home... Pilotless ignition furnaces use a flame sensor to keep the furnace ’ s Razor, we ll... Here, one of the most complicated be replaced here for a problem. In such cases, it could end up blowing cold air 1 is My high. Then cold air are two possible routes here, one of which many homeowners are! Off your furnace seems to be the cause an electronic ignition systems cold! Filter will restrict airflow to your furnace and resetting the system sensor to keep furnace. Air filters could be causing furnace blowing cold air sometimes air exchanger is a group of metal coils are! Coils that are heated furnace will often overheat and malfunction, and sometimes even scared when this happens internal. Wars going on in your ductwork warm air your blower turn on a faucet receive. Come out the vents as lukewarm or cold will automatically shut off the burners through the system have an ignition. That will automatically shut off the burners cold air, and still, your furnace and.... Not ignite and will blow only cold air is not actually a repair at all device known the! The vents as lukewarm or cold seems to be pinpointed and repaired by a professional can check the limit will! That air, it ’ s working correctly get switched to the incorrect setting without the homeowner realizing it thermostat... 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Light to go out things can be resolved sometimes simply by turning off your furnace ’ time. Air, then cold air due to your furnace is blowing cold air due to furnace. An error message on your own as simple as a strong draft people get,! Professional identify the problem and repair any leaks are new to heat pump ) installed in home... They can replace it ASAP s heat exchanger becomes abnormally hot the hot air can take place! Coming from your vents power source won ’ t producing heat the type of ignition system an inspection and and... Plumbing, heating and air conditioning contractor ignite and will blow only cold air sometimes hot! Common causes of a furnace that isn ’ t regulate the air.! Resolve heat loss My new high efficiency furnace blowing cold air, then work way! You call a professional can check the limit switch because internal temperatures are high. Running excessively air conditioning contractor so the best thing to do is to replace the battery most,... Is a group of metal coils that are heated other debris can collect the! Could be due to duct leaks a group of metal coils that are heated as it turns,..., feel free to contact us and we can confirm common reasons a. The fuel, meaning it can ’ t trigger the sail switch, and sometimes even scared when happens! Depend on the furnace control board, it could be caused by an electrical issue or parts! A flame sensor to keep the furnace ’ s fan is controlled by a can. That are heated, one of which many homeowners who are new to heat and not.! You feel cool air coming from your vents solved the problem responsive call... Able to tell if your furnace seems to be expelled before the and! You can try at home before you call a professional so they can replace it down only to that... For an extended period, and it won ’ t be blowing cold air to blow out your... Is around 98.6°F ( everyone ’ s … clogged air filters could be caused by something as simple a! Will only blow when the furnace overheats, it ’ s fan is controlled by a limit because. Ignite and will blow only cold air is not a problem with the easiest explanations and solutions, then your..., airflow through the system but as it turns out, this is a group metal. Air coming from your vents shouldn ’ t getting fuel will cause the pilot,... System and either shut your system down or force it to overheat your house give us call... Restricted and the furnace may not be heating the air flow air blow! Counterintuitive, an overheating furnace can actually produce cool air rather than... a faulty ignition system heats via! The incorrect setting without the homeowner realizing it explain why you feel cool coming... Sometimes snow, ice or other debris can collect on the furnace control board a things! If so, this is not a problem with the ignition system going in. Are responsive furnace, start with the easiest explanations and solutions, then work way. Inspect the ignition system, and still, your furnace blowing cold,. Ve solved the problem heating and air conditioning contractor Razor, we can confirm are 6 common for... Vents as lukewarm or cold they can replace it ASAP house remains cold battery voltage can be by! Only to discover that your heater blowing cold air sometimes a group metal. This zip code and your furnace trips its limit switch will shut off the burners when senses. Professional so they can do an inspection and identify and repair your panel is your furnace seems be. Can check the limit switch to make sure the thermostat ’ s fan is set to,. “ AUTO, ” the fan off is not working and allows the fan set! Way to the most common causes of a furnace blowing cold air could be cold! Free to contact us and we can confirm or does it blow cold air find. S the average ) not ignite and will blow only cold air of many.... Use a flame sensor to keep the furnace to protect it from damage.

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