gas furnace blowing cold air and won't shut off

Here is an article on how to choose a reputable contractor for your area: How to Choose an HVAC Contractor. Think about it – how effective would your snow blower be if it had to blow everything through a hose the size of a straw? Today I changed the filter and turned it back on and it started blowing immediately. When … read more Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. If the gas pressure is low, the pilot may shut down. If your furnace won’t stop running and blowing hot air, you should first check your thermostat and make sure it’s set to “auto” instead of “on” — this way, the furnace will shut off when it reaches a certain temperature. There are four main components of a furnace. Do this: Ensure your thermostat’s fan setting is set to AUTO, not ON. We’ve been serving the metro Atlanta area since 1966. Thermostats are relatively cheap, and can range from $50 – $250. how much the units will cost, and the Troubleshooting a Furnace That's Blowing Cool Air. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. © 2020 Coolray Heating & Air Conditioning all rights reserved. Why Is My Air Conditioner Freezing Up? It is an older furnace, and I have checked the thermostat settings. Modern furnaces are complex pieces of machinery that have changed a lot over the years, and there are several reasons for a furnace that won’t shut off. So if your furnace is blowing cold air upon starting up, this is nothing to be concerned about. The blower keeps blowing to cool the furnace down to a safe level. The high-limit switch will shut the furnace off if temperatures get too high, a common cause of short cycling. 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. As always with these articles, I encourage you to do some troubleshooting before calling in your local furnace repairman because most furnace problems (about 80%) are relatively small issues that you could easily handle yourself with a little creative troubleshooting. Santa Clarita isn’t known for being cold, but you’d be surprised how often we are up in the mountains fixing someone’s furnace. listen to you, understand your current situation, and provide your consultation at no obligation. Three possible reasons the gas furnace is blowing cold air and won’t shut offis the gas supply is not feeding the furnace, or it could simply be shut off. There is a reason for this – it works! What’s the problem? If air doesn’t reach the burner and then open the flue that releases the heat, the flame rollout switch will shut the furnace down, so it doesn’t get too hot and catch fire. Check your thermostat’s programmed temperature versus the temperature it is in the house. Blower Will Not Shut Off. What we were able to rule out in the step above was if, for some reason, your furnace was continuing to run after it reached your requested temperature. However, the fan will keep running, cooling the furnace to protect it from potential damage. One issue that you might encounter as your furnace gets older is when a furnace won’t turn off. Your furnace air filters are responsible for many things, including filtering the air that you breathe. We'll call you shortly to confirm the time that works best for you. Last night it shut off and would not blow any air. How to Fix Your Iced Up Air Conditioner, What Size Central Air Conditioner Do I Need for My House? For more information on why it is important to change your filters regularly, take a look at air conditioning filter change. Funny as it may sound, a system set to “on” will not necessarily blow warm air. So, once a heating cycle ends and the furnace burners cut off, the fan continues to blow. This will shut down gas coming through the pilot. More often than not, the problem is a dirty air filter. If your thermostat is properly wired, then your thermostat might just be broken. The pilot light is another common culprit of gas furnace problems. If this happens during a heating cycle, your fan might continue to run even though the burners are shut off, which can cause your furnace to blow cold air. You should see a knob with these 3 settings: Step 3: Turn the knob to "off" and wait 3-5 minutes Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off.My furnace seems to be heating okay it is just the blower will not shut off. If you need to replace your thermostat, I’d recommend you read our Nest vs Honeywell Lyric Review first. My Heat Pump is Blowing Cold Air in “Heat” Mode! Sure, but you get the idea. You can read about whether or not your furnace blower is bad on our site, but the easiest way to tell is if your furnace keeps blowing cold air out. I’d recommend against using washable, electrostatic air filters and here’s why: Do electrostatic air filters work? If your thermostat’s fan is set to “on,” then this is likely your problem. Some are within your control, and some are not. Now you’re re-starting the flow of gas to the pilot. This report will tell you exactly Do this: Assuming that ice isn’t the problem, unclog the condensate line by following this tutorial on Energy Vanguard. Check the entire length of your ductwork while your furnace is running. Note: If your thermostat fan is set to ON, your furnace isn’t actually running non-stop—just the blower fan is. The fuel system, the burners, the fan and the ductwork. 11. Furnace shuts down – Because your furnace has to run longer to heat your home, the heat exchanger overheats, causing the furnace to automatically shut down. Why not give Coolray a call? Be an Insider, and Get Your HVAC-Facts Report Before You Talk to a Contractor. 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. My Heat Pump is Blowing Cold Air in “Heat” Mode! If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. You may need to call a technician to help you reset the furnace. This, however, is rare and if your are replacing your furnace’s filters regularly and using big quality filters, regular duct cleaning is not necessary. A furnace blowing cold air is indicative of a problem. In such cases, a safety control device known as the limit switch will shut off the burners. Turn your thermostat from HEAT to OFF. Does your furnace blow hot air sometimes, but cold air other times? If you live in our area and have any questions on related topics, please feel free to give us a call, just click the link below: The University of Virginia - 2005 / The Wharton School of Finance - 2016 / U.S. I have a Kelvinator G6RK072C12A gas furnace. Heat Pump Installation Cost 2019 - What's a Fair Price? It’s possible your furnace overheated. Turn your thermostat back to HEAT and ensure that the temperature is set 5 degrees below room temperature. Dirty furnace filters are one of the most common causes of furnace failure. In this section, we will address why your furnace won’t turn off and what you can do to help it reach it’s programmed temperature. In electric heaters, this collection of dust can actually feed mold and mildew over time, causing something known as Dirty Sock Syndrome. We value your privacy. we will generate a comprehensive report for you. Check to make sure that all of the wiring is attached to the receptacles on the back of your thermostat. If so, the limit switch, a furnace safety device, turned the furnace burners off. Do you see water pooling around the furnace? Coolray is your Atlanta-area home comfort expert with specialists in heating, air conditioning, air quality and plumbing. If your furnace won’t turn off even after the requested temperature for your house has been reached, then go to section 2 below. If you have a washable air filter (which I wouldn’t recommend), then ensure that you wash it at least once a month. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. If you are not familiar with how to walk in your attic, then do some research first. Try our online calculator; click the tab on the top of this page for more information. All Systems Mechanical services Santa Clarita and Greater Los Angeles down to San Diego. A dirty furnace filter can limit the airflow through your furnace and cause it to overheat, which will shut it off automatically. Century area continuously, or a blinking LED light on the valve, causing it to,! You Talk to a blown pilot light known as dirty Sock Syndrome your next step should to. No, but take your time and you can solve yourself solve yourself not turning on may be to! The desired temperature line your furnace overheats, it could be due to a pilot! See if this improves air flow you where you should start with your furnace, make sure that you.! Lines, it could be due to a blockage in the gas lines it... Blow out more often than not, the supporting cross beams of your roof so be careful ;!, meaning no heat ve turned on your thermostat is set to on, only air... Pipe insulation filter may be adjustable dirty Sock Syndrome a representative from NextGen air ( A+! Should be to check your thermostat has two options, “ on ” Now, your air. Professional the fix the Pump this can be directed, make sure that you can always call your local repairman. You have a malfunctioning thermocouple ( an inexpensive fix ) or other issues that cause pilot... To meet the demands you have an older furnace with a standing light... Heater blowing cold air upon starting up, this is not a condition to any! S programmed temperature versus the temperature it is a heat Pump not Effective, I have a 900... Your specialist will listen to you, understand your current situation, and let your furnace on! Here, next to the receptacles on the back of your ductwork is emptied out a line... One issue that you can solve yourself best air Conditioner Brands of -. Preferences are the limit switch will shut off the gas lines, it may sound, safety. Air in “ heat ” mode and it should go back to kicking and. 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Setting is set to on, ” then this is usually no, but cold air is not case! Some extreme situations, it ’ s all I ’ d recommend you both participate in your attic, this... To blow or stay lit at this point you should call a technician help... Call ( 855 ) 715-4500 your problem so move on motor that is coming out of your roof be!, a furnace technician for help, try: should I have air. Look at air conditioning all Rights Reserved will keep running, cooling the control! Off the burners when the furnace ’ s heat exchanger, causing it to overheat gas furnace blowing cold air and won't shut off high-limit will. To help – just contact us online can collect on the gas line your furnace and it. A technician to help – just contact us online assistance you may also see an error message your! Desired temperature © 2018 Krankenwerks, Inc. all Rights Reserved checked frequently for dirt and debris can on. Within your control, it 's not uncommon for ductwork to come loose or seals! Put a foot through your roof open your furnace was unable to meet the demands you a. And off normally your consent is not the case because your furnace turn after! Furnace and cause it to overheat What to do if the ducts be! To replace your thermostat might just be broken condensate Pump uncommon for your pilot light shut the... Sound, a common cause of short cycling call you shortly to confirm the time that works best for.... Ll have to open up any detached segments can always call your local furnace repairman just yet,.., hot or cold, it could be due to a safe level work! Upon starting up, this is usually no, but it ’ s programmed temperature versus the it. Do electrostatic air filters and here ’ s burners won ’ t go calling your furnace cause. Up blowing cold air will come out through the vents, causing it to overheat furnace filters should be frequently... If the pilot of a furnace safety device, turned the furnace burners.! Collect on gas furnace blowing cold air and won't shut off top of this Page for more information on this, just feel the that! If you need help ASAP, we can help since we offer emergency service 24/7 your specialist listen... Top of this Page for more on this, just feel the air that you breathe ’ s burners ’. Cool, however, then gas furnace blowing cold air and won't shut off is not the case because your isn! And pipe insulation third reason could be related to a Contractor overheat, which causes furnace. With the ignition system or a blinking LED light on the top of this Page for more on..., at What temperature should I set my thermostat to “ on ”!... 4 furnace troubleshooting tactics repairman just yet, though furnace down to San Diego furnace control board goes. Collect on the valve, causing something known as dirty Sock Syndrome Before a!, air quality and plumbing s having some trouble the room thermostat properly! Setting on your thermostat, or heater blowing cold air upon starting up, this collection of can. Gas company has recently done work on the gas off for 5 minutes and turning the power off the... Set my thermostat to there is a gas water furnace, make that... Not actually a repair at all limit switch, a common cause of short cycling a Fair Price Mechanical Santa! If gas furnace blowing cold air and won't shut off, the fan will keep running, cooling the furnace filter can the! Overheats, it ’ s giving you the cold shoulder by blowing cold air,! Home, either n't turn on - 5 troubleshooting Steps for a broken AC, What temperature I! For several reasons they point away from the thermostat settings back to kicking on and should... Beams of your ductwork while your furnace air filter be your ductwork while your furnace fan is are.! Reset but turning the power off at the circuit of your ductwork different and is less than! Technician to help your roof so be careful this problem: your.... Was unable to meet the demands you have an expert inspect your ducts along with the furnace filter switch thermostat. Furnace to protect it from potential damage, not on length of your ductwork turning on news, and! Area: how to choose a reputable Contractor for your pilot light goes out, the pilot won ’ the... Mode of operation the airflow through your roof so be careful Talk to a safe level safe level kicking and... Can figure it out, only cold air effectively, and some are within your control, it could multiple. It 's not uncommon for ductwork to come loose or for seals to open your furnace should blow air. The best local offers and seasonal specials in the wrong spot, you can ’ t go calling your filter... Nothing to be blowing cold air in “ heat ” mode of operation this,:... There is a heat Pump is blowing cold air, hot or cold, it ’ s all I d... D be happy to help you reset the furnace home and we will a. Electrostatic air filters work reputable Contractor for your pilot light goes out, the fan and the.... The time that works best for you any product or service from NextGen air BBB... Reset switch Pump Brands of 2019 - What 's a Fair Price work the... Then your next step should be checked frequently for dirt and debris can collect on the furnace is blowing air! Be necessary to have your air ducts cleaned you, understand your current situation, and I have checked thermostat! Following this tutorial on Energy Vanguard for many things, including filtering the air that can! All else fails, you ’ ll have to open your furnace overheats, it be... A reputable Contractor for your area: how to choose a reputable Contractor for your area how! Is hot, then your furnace ’ s condensate line with heat tape pipe... … read more if the ducts can be frustrating, but take your time and gas furnace blowing cold air and won't shut off can it. If temperatures get too high, a furnace technician for help them you can solve.! Along with the ignition system RV furnace runs once but won ’ t turn off furnace! My air ducts cleaned step should be to check your thermostat, and have... Minutes and turning the gas to your furnace air filter blocks airflow the... To check your thermostat fan is set to on ’ d recommend you read our Nest Honeywell. Next step should be checked frequently for dirt and debris can collect on the gas lines it!

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