If your furnace seems to be blowing cold air, it could be a problem with the ignition system. Your thermostat’s fan setting may be set to ON. Just check with your significant other first – that’s all I’m saying. There is a reason for this – it works! If the pilot light isn’t lit, then the furnace’s burners won’t light, meaning no heat. This is not the case because your furnace is continuously running to reach your requested temperature, but it’s having some trouble. Then the furnace’s condensate line (usually a PVC pipe) may be blocked, which causes the furnace to shut down. Check the wiring to your furnace's thermostat. If your furnace keeps blowing hot air and won’t stop, the furnace burners aren’t turning off. In such cases, a safety control device known as the limit switch will shut off the burners. Furnace Won't Turn Off - Furnace Troubleshooting. If you suspect ice is the problem, then wrap the condensate line with heat tape and pipe insulation. If your furnace won’t turn off, one of the easiest things to fix can be your ductwork. If it is cool, however, then your next step should be to check your thermostat. For immediate assistance you may call (855) 715-4500. Inadequate gas supply. Step 4: Turn the knob to "pilot" and press down the knob 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. These 5 fixes can solve most furnace problems without you needing to pay for a repairman to come out. Your furnace filter may be located here, next to the blower. 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. Your gas supply could be turned off. 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. Sure, but you get the idea. 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. Those of you who read our articles regularly, know that we are a small, U.S. Veteran-Owned HVAC company in Southern California, and pride ourselves in giving people honest, straight answers to their questions. We want to make sure everyone's questions are answered. Your furnace air filters are responsible for many things, including filtering the air that you breathe. When the flame lights, it should be a steady blue cone that hits the middle of the thermocouple (a small copper bar). HVAC Installation Cost 2019 - What's a Fair Price for a New Heating and Air Conditioning Installation? If it is hot, then this is not your problem so move on. So before calling a professional for help, try these 4 furnace troubleshooting tactics. In most cases, when used in a forced-hot-air system, oil, wood, or natural gas are used to fire up the burner. not call registry. Heat Pump Installation Cost 2019 - What's a Fair Price? This “hot then cold air” sequence happens over and over and your home isn’t warming up. This will then heat your house more effectively, and let your furnace turn off after it reaches the desired temperature. 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. Get up-to-date current news, promotions and industry tips. You should check or change your air filter every three months at least. 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. You should be getting hot air now. ON makes your furnace’s blower run non-stop but AUTO will tell your furnace’s blower to run only when heat is being produced, so it should shut off once your home reaches the desired temperature. We'll call you shortly to confirm the time that works best for you. Look, if you’ve tried all of these steps, and you still can’t repair it, then it just might be time. furnace won't shut off (heater, gas, electric, repair) - House -remodeling, decorating, construction, energy use, kitchen, bathroom, bedroom, building, rooms - City-Data Forum This means that when the furnace is on, only cold air will come out through the vents. Here is an article on how to choose a reputable contractor for your area: How to Choose an HVAC Contractor. Does your furnace blow hot air sometimes, but cold air other times? You can think of your blower motor as kind of like a big fan (actually, that’s exactly what it is). 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. The pilot light is another common culprit of gas furnace problems. 1) Change the furnace’s air filter if it’s dirty Last night it shut off and would not blow any air. Your consent is not a condition to purchase any product or service. But if your furnace fan won’t stop running, two problems you might have with your furnace fan limit switch include: Bad analogy? Now you’re re-starting the flow of gas to the pilot. Seal any leaks with HVAC tape and reattach any detached segments. Air Conditioner Won't Turn On - 5 Troubleshooting Steps for a Broken AC, What is a Heat Pump? 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. Make sure you consult a specialist first, but before you do anything, you’ll want to know some important information that can keep you from being ripped-off. Basically, the furnace isn’t lighting the fuel, meaning it can’t heat your home, either. 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. © 2021 Coolray Heating & Air Conditioning all rights reserved. Your furnace may be blowing cold air because the filter is too dirty. Check to make sure that all of the wiring is attached to the receptacles on the back of your thermostat. Click to Enlarge – Excerpt Page 3 of 12 from the HVAC Design & Consultation Program. Do you have an older furnace with a standing pilot light? If your unit is blowing cold air, you’re in the right place. 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. If it shuts off, then your furnace was unable to meet the demands you have placed on it. Does your furnace blow hot air sometimes, but cold air other times? 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. One issue that you might encounter as your furnace gets older is when a furnace won’t turn off. If the problem persists, it’s time to make the call. Furnace burners won’t turn off. To troubleshoot a misbehaving gas furnace, start with the easiest explanations and solutions, then work your way to the most complicated. 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). Naval Aviator 2005-2015. If your gas company has recently done work on the gas lines, it's not uncommon for your pilot light to blow out. Check to see if it is your blower motor that is running continuously, or your whole furnace. If your furnace overheats, it could end up blowing cold air. Do you see water pooling around the furnace? If so, the limit switch, a furnace safety device, turned the furnace burners off. 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. I did the reset but turning the gas off for 5 minutes and turning the power off … We answer the most common issues causing your gas furnace to blow cold air instead of … So you’ve turned on your furnace, but it’s giving you the cold shoulder by blowing cold air. The blower keeps blowing to cool the furnace down to a safe level. Help! A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. If you have gotten this far, then the next step I’d take would be to open up your thermostat and detach it from your wall. Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. Can’t find them? 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. Check the entire length of your ductwork while your furnace is running. Now it won't turn b … read more 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. 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. You may have a malfunctioning thermocouple (an inexpensive fix) or other issues that cause the pilot light to burn improperly. You may need to call a technician to help you reset the furnace. So if your furnace shuts down or stops blowing cold air, you’re in a chilly situation. When you have a hole in your air duct, all the hot air that you wanted to have blown through your vents will escape through the holes. Air filter is too dirty. If you own a gas furnace, keeping the unit in top running condition is important for the safety of the home’s occupants. Step 7: Turn the furnace on at the thermostat The Heat Pump Crash Course from ASM-air, At What Temperature is a Heat Pump Not Effective? Only walk on joists, the supporting cross beams of your roof. what sized unit you will need, which brands consumers prefer, For more information on why it is important to change your filters regularly, take a look at air conditioning filter change. Simply answer a few additional questions about your home and Fixing A Gas Furnace Blowing Cold Air Could Be Easy Follwing These 7 Steps First. how much the units will cost, and the Furnace Blower Won’t Shut Off – Not Heat Coming Out. This setting will ascertain that your unit only runs when it is heating the air. However, fixing the problem can be easier than you think. At All Systems Mechanical air conditioning and heating, we believe that the experience our clients have is every bit as important as the products they receive. The furnace will run constantly to keep up on a cold night. Over time, air ducts degrade and eventually end up blowing holes in them. In electric heaters, this collection of dust can actually feed mold and mildew over time, causing something known as Dirty Sock Syndrome. fair rate you should spend for the total project. 11. It is an older furnace, and I have checked the thermostat settings. Problem: Heater won’t shut off. Save money here on your Heating and AC system! Well, it could be multiple issues; some of them you can solve yourself. We’ve been serving the metro Atlanta area since 1966. Check your furnace’s manual. Now, your furnace should ignite. Thermostats are relatively cheap, and can range from $50 – $250. 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. However, the fan will keep running, cooling the furnace to protect it from potential damage. Ice (only during cold snaps and if the line runs through an unconditioned space). 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. the air keeps blowing 24/7. 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. Or the gas line isn’t supplying enough gas to your furnace. If you step in the wrong spot, you might put a foot through your roof so be careful! Be an Insider, and Get Your HVAC-Facts Report Before You Talk to a Contractor. We’d be happy to help – just contact us online. 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. Leaking ductwork can be one of the most detrimental issues that your furnace can face while heating your home, but it’s also one of the easiest to fix. Here are still a few things that you can figure out yourself. This all depends on the reason why your furnace won’t shut off. Common causes of condensate blockage are: Besides blockages, the condensate overflow may also be caused by a broken condensate pump. It’s possible your furnace overheated. 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. If your thermostat is properly wired, then your thermostat might just be broken. If you have a spouse or partner, we recommend you both participate in your estimate/service appointment. Do you have a high-efficiency furnace? Check that it is in the “auto” or “on” mode of operation. If your furnace is pumping all of it’s hot air into your attic, then your furnace will have difficulty heating your house right? In some extreme situations, it may be necessary to have your air ducts cleaned. Try our online calculator; click the tab on the top of this page for more information. 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. What to do if the pilot won’t light or stay lit Explanation: If your furnace is overheating, that means your heat exchanger is getting too hot. Step 5: As you press the knob, hold a lighter to the pilot opening until the flame lights Without knowing more information it is not easy to be of more help. Turn your thermostat from HEAT to OFF. Over the years, it is not uncommon for ductwork to come loose or for seals to open up. Note: If your thermostat fan is set to ON, your furnace isn’t actually running non-stop—just the blower fan is. Source. Today I changed the filter and turned it back on and it started blowing immediately. we will generate a comprehensive report for you. A Short Consumer's Guide From ASM, Furnace Keeps Turning On and Off Repeatedly. what temperature should I set my thermostat to? Change the air filter. If your furnace blower won’t shut off, but there’s no heat coming from the unit, the following troubleshooting elements will help. But you might be surprised to know that your furnace’s air filter isn’t really for you (you are a side benefit), it is actually to ensure that there is no dirt and debris collecting inside of your furnace heat exchanger, or other vital components. AUTO ensures that the blower will run only when the furnace heats the air. And if you need help ASAP, we can help since we offer emergency service 24/7. Blowr fan won't stop: Forced air heating or cooling air handler troubleshooting: blower fan won't shut off: This article describes what to check if the furnace or forced air blower fan does not stop when you expect it to do so. Call the Professionals. when the house needs to heat up, it blows hot air like it should, but instead of shutting down at the end of the heat help! If the wires are all in place, you might want to dig out your thermostat’s manual and ensure that it is wired correctly. Switch your thermostat to “auto” mode and it should go back to kicking on and off normally. Check your thermostat’s programmed temperature versus the temperature it is in the house. Top 10 Heat Pump Brands of 2020 - Which is the Best Heat Pump Brand? You’ll have to open your furnace’s cover to access the reset switch. 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. You should be replacing your air filter every three months, and more often during times of high usage or if you live in a dusty area. The answer to this is usually no, but it’s still worth a quick read. A furnace that utilizes forced-hot-air is made of the plenum, the furnace blower, and the burner. listen to you, understand your current situation, and provide your consultation at no obligation. If your thermostat’s fan is set to “on,” then this is likely your problem. For more information on this, take a look at, what temperature should I set my thermostat to? This can be frustrating, but take your time and you can figure it out. If you are not familiar with how to walk in your attic, then do some research first. Then check the following: If your thermostat’s programmed temperature is lower than the temperature you have set, then this tells you that your furnace is continuously running to try and keep up with this demand. Step 2: Find the furnace’s pilot light assembly and reset switch We value your privacy. Try replacing your furnace air filter and see if this improves air flow. We've got you covered! Some are within your control, and some are not. 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