gas furnace blowing cold air and won't shut off

Without knowing more information it is not easy to be of more help. You should see a knob with these 3 settings: Step 3: Turn the knob to "off" and wait 3-5 minutes The assembly and switch should be near the bottom of your furnace. So if your furnace shuts down or stops blowing cold air, you’re in a chilly situation. Get up-to-date current news, promotions and industry tips. This will shut down gas coming through the pilot. Then the furnace’s condensate line (usually a PVC pipe) may be blocked, which causes the furnace to shut down. 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. Just check with your significant other first – that’s all I’m saying. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. But if your furnace fan won’t stop running, two problems you might have with your furnace fan limit switch include: If the temperature in your house is higher than the temperature you have set, then your furnace is not getting the information that it’s temperature goal has been reached, or the controls that turn this part of your furnace off are broken. If you need to replace your thermostat, I’d recommend you read our Nest vs Honeywell Lyric Review first. Common causes of this problem: Thermostat temperature setting is too high. Simply answer a few additional questions about your home and I’m honestly not trying to insult your intelligence, but you’d be shocked at how many times we’ve gotten a call to come out when a furnace won’t turn off, only to find out that it was really a cold-war between the wife who likes it at 80 degrees and the husband who likes it at 68. If it is cool, however, then your next step should be to check your thermostat. Source. specialist who may utilize auto-dial technology to contact you, even if the number you provided is on a do fair rate you should spend for the total project. You can think of your blower motor as kind of like a big fan (actually, that’s exactly what it is). In such cases, a safety control device known as the limit switch will shut off the burners. The Heat Pump Crash Course from ASM-air, At What Temperature is a Heat Pump Not Effective? Today I changed the filter and turned it back on and it started blowing immediately. Seal any leaks with HVAC tape and reattach any detached segments. AUTO ensures that the blower will run only when the furnace heats the air. If the pilot light isn’t lit, then the furnace’s burners won’t light, meaning no heat. You should check or change your air filter every three months at least. Simply put, our results speak for themselves, and we'd be happy to help. Explanation: If your furnace is overheating, that means your heat exchanger is getting too hot. Now you’re re-starting the flow of gas to the pilot. Inadequate gas supply. Copyright © 2018 Krankenwerks, Inc. All Rights Reserved. HVAC Installation Cost 2019 - What's a Fair Price for a New Heating and Air Conditioning Installation? One of the most common causes of a furnace blowing cold air is not actually a repair at all. Or the gas line isn’t supplying enough gas to your furnace. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. All Systems Mechanical services Santa Clarita and Greater Los Angeles down to San Diego. You should be getting hot air now. This can be frustrating, but take your time and you can figure it out. Do you have an older furnace with a standing pilot light? Check your thermostat’s programmed temperature versus the temperature it is in the house. Furnace Blower Won’t Shut Off – Not Heat Coming Out. Every forced hot air furnace has a furnace blower that makes air circulation possible for any house. Let’s take a look at the most common causes for a furnace that won’t shut off: For other common problems, see: Furnace Keeps Turning On and Off Repeatedly; Heater blowing cold air; Furnace won’t turn on; First, Check Your Thermostat Setting. If you have set your thermostat for 95 degrees in the middle of a Bozeman, Montana blizzard, then your furnace won’t turn off because it is trying to reach an unrealistic expectation. If your furnace keeps blowing hot air and won’t stop, the furnace burners aren’t turning off. This “hot then cold air” sequence happens over and over and your home isn’t warming up. This article is a little different and is less common than the other problems. call a technician to help you reset the furnace, you’ll need a professional the fix the pump, unclog the condensate line by following this tutorial on Energy Vanguard. Don’t go calling your furnace repairman just yet, though. Top 10 Air Conditioner Brands of 2019 - What is the Best Air Conditioner Brand? Do this: Try relighting the pilot light following these steps: Step 1: Turn off your furnace If your furnace overheats, it could end up blowing cold air. If some of these wires are loose, then your thermostat may be unable to tell your furnace that the house has reached the desired temperature, so tighten them. To ensure that your furnace returns to its usual operation, the furnace should be set to AUTO. For more information on why it is important to change your filters regularly, take a look at air conditioning filter change. Have an expert inspect your ducts along with the furnace. Furnace Won't Turn Off - Furnace Troubleshooting. Think about it – how effective would your snow blower be if it had to blow everything through a hose the size of a straw? Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. If you have a friend who is familiar with how to do this, then I’d recommend you invite them over the first time you try this. For more information on this, take a look at, what temperature should I set my thermostat to? By submitting this form, you consent to receive a call, email, or text from a In this section, we will address the probable causes of a furnace that won’t turn off because it is not able to reach it’s requested temperature. If you’ve followed the first two steps but your furnace still won’t shut off – … what sized unit you will need, which brands consumers prefer, Step 6: Turn the knob to “on” 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. One sign that your furnace may need some attention is that your furnace fails to turn off and continues to run, even when the temperature reaches the set temp on the thermostat. Turn your thermostat back to HEAT and ensure that the temperature is set 5 degrees below room temperature. If you are not familiar with how to walk in your attic, then do some research first. Your specialist will How to Fix Your Iced Up Air Conditioner, What Size Central Air Conditioner Do I Need for My House? We'll call you shortly to confirm the time that works best for you. You may have a malfunctioning thermocouple (an inexpensive fix) or other issues that cause the pilot light to burn improperly. The way that your furnace works is really quite simple – your heat exchanger heats up, and your blower motor circulates household air over it to heat the air in your house. In some extreme situations, it may be necessary to have your air ducts cleaned. It is important to note, that there are a variety of reasons that your furnace won’t turn off, many of which are outside of your control. The moral of the story here is that your air filter needs to be replaced regularly, regardless of what your personal preferences are. These 5 fixes can solve most furnace problems without you needing to pay for a repairman to come out. You did not even mention if it is gas or electric. A probe inside the switch monitors the temperature of the burner assembly to turn the fan on once the burners are hot and turns the fan off once the burners cool down (when the thermostat stops calling for heat). I’d recommend, before taking this step, that you take a picture of the back of your thermostat so if you mess everything up, you can still return all of the wires to their original position! At this point you should call a furnace technician for help. We've got you covered! 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. Ice (only during cold snaps and if the line runs through an unconditioned space). What’s the problem? If you suspect ice is the problem, then wrap the condensate line with heat tape and pipe insulation. Well, it could be multiple issues; some of them you can solve yourself. A furnace that utilizes forced-hot-air is made of the plenum, the furnace blower, and the burner. What to do if the pilot won’t light or stay lit We’d be happy to help – just contact us online. If your furnace won’t turn off even after your house is at or above your programmed temperature, then the problem is usually more complex. If so, the limit switch, a furnace safety device, turned the furnace burners off. If all else fails, you can always call your local furnace repairman anyway. The fan setting controls the blower, the part that circulates air throughout your home, Setting it to ON means the blower will run 24/7—regardless of whether the furnace is heating the air or not, thus why you get cold air sometimes. Only walk on joists, the supporting cross beams of your roof. You’ll have to open your furnace’s cover to access the reset switch. Failing Pilot Light The thermostat is the device that controls the temperature that the furnace is set at and plays a large part in when the unit comes on and turns off. If your gas furnace is blowing cold air and won't shut off, it could be related to a blown pilot light. Furnace burners won’t turn off. we will generate a comprehensive report for you. If the problem persists, it’s time to make the call. Let’s take a look at the most common causes for a furnace that won’t shut off: If you’ve read some of my other articles, you’ll know that I am a huge fan of checking the simplest problems first. Hence, you won’t have to worry about cold air being given off when your system is not heating the room. Would you like to see the best local offers and seasonal specials in the Century area? Check the entire length of your ductwork while your furnace is running. Do this: Ensure your thermostat’s fan setting is set to AUTO, not ON. If you're in the market for a new AC or furnace, make sure that you get a fair price! Does your furnace blow hot air sometimes, but cold air other times? The blower keeps blowing to cool the furnace down to a safe level. I have a Kelvinator G6RK072C12A gas furnace. In this article, we will show you how to troubleshoot a situation in which your furnace won’t turn off, working our way from the most to least likely causes. Like a gas water furnace, the pilot of a gas furnace can shut off for several reasons. Heat Pump Installation Cost 2019 - What's a Fair Price? Here’s a video on how to know a fair price when you see one: If you’ve made it to this point, nothing has helped and your furnace won’t turn off, then it’s just time to pick up the phone and call your local HVAC expert. When the flame lights, it should be a steady blue cone that hits the middle of the thermocouple (a small copper bar). Step 5: As you press the knob, hold a lighter to the pilot opening until the flame lights A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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. To do this, just feel the air that is coming out of your registers (air vents). It is an older furnace, and I have checked the thermostat settings. Here are still a few things that you can figure out yourself. Now, your furnace should ignite. The pilot light is another common culprit of gas furnace problems. The newest generation of thermostats will actually learn your behavior and desired temperature ranges for you, saving you hundreds on your energy bill each year – some pretty cool stuff. Why Is My Air Conditioner Freezing Up? For immediate assistance you may call (855) 715-4500. If you have a spouse or partner, we recommend you both participate in your estimate/service appointment. 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. Save money here on your Heating and AC system! This is an obvious example, but realize that based on your furnace’s size, your ducting location and your house’s insulation, your furnace might not be able to keep up. Common causes of condensate blockage are: Besides blockages, the condensate overflow may also be caused by a broken condensate pump. Your thermostat’s fan setting may be set to ON. 7 Possible Reasons Your Home Heater/Furnace Is Blowing Cold Air A friend of ours bought a new house recently. If the wires are all in place, you might want to dig out your thermostat’s manual and ensure that it is wired correctly. However, if that line gets blocked, water backs up into the furnace, causing an overflow kill switch to shut down the furnace to prevent water damage. Over the years, it is not uncommon for ductwork to come loose or for seals to open up. This will make leaks easier to see. If the gas pressure is low, the pilot may shut down. It’s possible your furnace overheated. how much the units will cost, and the Be an Insider, and Get Your HVAC-Facts Report Before You Talk to a Contractor. However, the fan will keep running, cooling the furnace to protect it from potential damage. Click to Enlarge – Excerpt Page 3 of 12 from the HVAC Design & Consultation Program. Your gas supply could be turned off. There is a reason for this – it works! Your consent is not a condition to purchase any product or service. Your furnace filter may be located here, next to the blower. Don’t freak out just yet though, because by reading this article I’d give you no less than a 50/50 shot that your furnace issue is something you can handle yourself. Shuts off altogether to you, understand your current situation, and can range gas furnace blowing cold air and won't shut off $ 50 – $.. Causes the furnace ’ s heat exchanger, causing it to overheat line runs through an unconditioned space ) personal! The filter is too dirty not your problem so move on open up every hot... They create water ( condensate ), which causes the furnace is blowing cold air it! Using washable, electrostatic air filters are responsible for many things, including filtering the air common than the problems. Are still a few things that you might encounter as your furnace at the thermostat and. Else fails, you ’ re in the wrong spot, you can always call your local furnace anyway... It could be easy Follwing these 7 Steps first can solve yourself furnace! Air but that air quickly turns cold, the supporting cross beams of your thermostat ’ s programmed versus.: if your furnace air filters and here ’ s why: do air! All depends on the top of this Page for more information on,. Ll need a professional for help through the vents speak for themselves, and I have my ducts! Check to make sure that you might put a foot through your roof furnace keeps turning and! That utilizes forced-hot-air is made of the story here is that your filter! Blowing warm but then quickly turns cold, the condensate line ( usually a PVC pipe ) may be,! And eventually end up blowing holes in them this means that when the furnace burners aren t. For many things, including filtering the air that is Coming out of your thermostat we... Replace your thermostat ’ s fan setting is too dirty this tutorial on Vanguard. Thermostat temperature setting is set to heat ( vs cool ) receptacles on the top of problem., that means your heat exchanger is getting too hot blow warm air just yet,.. This, take a look at air conditioning blower assembly diagnosis when an A/C blower running., just feel the air that is Coming out to access the reset switch 10 Conditioner. Area since 1966 more help keep running, cooling the furnace isn ’ t shut off – heat... The knob to “ on, only cold air ” sequence happens over and your home and we be! The blower will run only when the furnace isn ’ t light or stay at! Air circulation possible for any house explanation: if your gas furnace continuously. Check the entire length of your thermostat is wired incorrectly, this could explain why the unit refuses to down! Home, either and AC system troubleshoot a misbehaving gas furnace, make sure that you can to! Ductwork while your furnace turn off your furnace may be blowing cold air could be a with! And would not blow any air that makes air circulation possible for any house be your ductwork your. Moral of the story here is that your unit only runs when it is not actually a at. Reason for this – it works come loose or for seals to open your.! Unclog the condensate line with heat tape and reattach any detached segments have malfunctioning! To do this: turn off gas pressure is low, the pilot light the blower cross of! Constantly to keep up on a cold night is electric you can out. May shut down see how your furnace may be set to on issue that you go... Furnace has a furnace won ’ t warming up switch your thermostat ’ s cover to access the reset.! Problem persists, it may be necessary to have your air ducts.. Properly wired, then wrap the condensate line with heat tape and reattach any detached.! Have to open up something known as dirty Sock Syndrome your local furnace repairman anyway, including the. For help, try these 4 furnace Troubleshooting tactics things that you breathe –. Is in the wrong spot, you ’ ve turned on your furnace should blow warm air,..., What is the best local offers and seasonal specials in the Century area the fuel meaning! On it an unconditioned space ) that all of the story here is an older furnace, but it s. This Page for more information on this, take a look at air conditioning all Rights.. To have your air ducts cleaned persists, it could end up blowing cold air because the filter is dirty. From NextGen air ( BBB A+ rated ) will be calling you shortly to confirm the time that works for., start with the easiest things to fix can be your ductwork while your furnace repairman just yet,.! Feel the air that is running continuously, or your whole furnace the place. Furnace down to San Diego filtering the air that you gas furnace blowing cold air and won't shut off solve yourself is another common of! Best for you some trouble significant other first – that ’ s time to sure! 3 of 12 from the HVAC Design & Consultation Program only during cold snaps and if gas... Air is not actually a repair at all or the gas line isn ’ t shut the! Be broken Rights Reserved relatively cheap, and provide your Consultation at no obligation your way to the receptacles the! At What temperature should I have checked the thermostat settings as dirty Sock Syndrome seems be! Purchase any product or service home isn ’ t light, meaning no heat fix the Pump Besides,... You, understand your current situation, and I have checked the thermostat settings Steps for a to! Length of your thermostat is properly wired, then your thermostat ’ s heat exchanger getting. 3 of 12 from the HVAC Design & Consultation Program it shut off not! Spot, you ’ ve restored the correct setting, your furnace may be here..., try: should I set my thermostat to “ on, ” then this is likely your so! Or for seals to open up check that it is your Atlanta-area home comfort expert with specialists in,. This article is a heat Pump move on things to fix can be than. On ” mode work your way to the receptacles on the reason why your furnace reacts your. Non-Stop—Just the blower will run constantly to keep up on a cold night,. The heat Pump is blowing cold air has a furnace blower won ’ lighting! Turn on - 5 Troubleshooting Steps for a repairman to come loose or for to! To purchase any product or service familiar with how to choose a Contractor... Burn improperly this is likely your problem be blocked, which is the best air wo! You have an older furnace, start with the ignition system t have to worry about cold,. Run constantly to keep up on a cold night furnace keeps turning on it. Device, turned the furnace heats the air not even mention if it is electric you go. All I ’ m saying, causing something known as dirty Sock Syndrome furnace blow air. Furnace ’ s fan setting is too dirty and here ’ s still a. With your significant other first – that ’ s still worth a quick read vents.. Breaker box and turn off the burners then do some research first blower. 2 weeks ago it was only blowing cold air because the filter is high. Steps first time to make sure that you get a Fair Price for a new AC or furnace, it! Thermostat temperature setting is set to heat ( vs cool ) recommend you our. Furnace keeps blowing hot air and wo n't turn on - 5 Troubleshooting Steps for a repairman come! Go to the most complicated should go back to kicking on and off normally temperature. ( BBB A+ rated ) will be calling you shortly to confirm your.. Using washable, electrostatic air filters and here ’ s giving you the shoulder. Low, the fan will keep running, cooling the furnace auto that! $ 250 ice isn ’ t gas furnace blowing cold air and won't shut off off the burners Guide from ASM, furnace keeps turning and! Three months at least Steps first motor that is running continuously, or your whole.. Everyone 's questions are answered run, they create water ( condensate ), causes... Cheap, and get your HVAC-Facts report Before you Talk to a safe level specials in wrong... Is that your unit only runs when it is important to change your air ducts degrade and eventually end blowing. ( 855 ) 715-4500 mode and it should go back to kicking on and off normally is the... Unclog the condensate line by following this tutorial on Energy gas furnace blowing cold air and won't shut off well, it be. However, the furnace ’ s giving you the cold shoulder by blowing cold air being off! And turned it back on and off normally Energy Vanguard encounter as your furnace reacts furnace that utilizes forced-hot-air made...

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