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. If you need to replace your thermostat, I’d recommend you read our Nest vs Honeywell Lyric Review first. I finial decided to turn it off from the thermostat and still the furnace stayed on. Did your furnace fan stop blowing? A dirty air filter prevents air from passing through it and into your home. There has been a programmable thermostat on it for 5 or 6 years, and recently we had a problem where the furnace cut in and would not stop (it was set for 70 degrees and got up to 78 before I shut off the emergency switch). Copyright 2016 Content | Advanced Furnace & Air Duct Cleaning | All Rights Reserved. Or if your thermostat has a HEAT OFF COOL or FAN AUTO OFF control, set the control to OFF or COOL. If it shuts off, then your furnace was unable to meet the demands you have placed on it. To do this, just feel the air that is coming out of your registers (air vents). Be an Insider, and Get Your HVAC-Facts Report Before You Talk to a Contractor. This article is a little different and is less common than the other problems. First Step: Change the thermostat setting up or down If the heating system won't turn OFF, that is if heat keeps being delivered even when you don't want it, set the thermostat to its lowest temperature setting and wait three to five minutes. 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. I finally had to trip the breaker to turn it off. I removed the thermostat faceplate, removed the battery, let it sit for awhile, and reinstalled everything. thank you for that it, too. I went back to your response with the photo and you clearly said furnace, not thermostat. We value your privacy. I have a new digital thermostat on it, configured for electric heat (had the same problem with the original thermostat). I have a very old dial thermostat. Is This Legitimate? If your furnace won’t shut off, you likely have one of the following problems: Incorrect setting on thermostat. 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. 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. Is your furnace not responding to your thermostat? Replaced the control board today, no change. 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. When your furnace won’t turn off but it’s blowing cold air, it could simply be due to a setting on your thermostat. My furnace would not shut off. 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. I have disconnected the stat and had to flip braker to shut off. Check to see if it is your blower motor that is running continuously, or your whole furnace. Hello all, I have a problem with my gas furnace. Some are within your control, and some are not. If the inducer stops then the relay on the circuit board is sticking ON and you need a new board. I have a forced hot air oil furnace. I replaced the batteries - did not help - so I bought a new programmable thermostat - problem still occurs. Two very common causes are that the thermostat is set too high, or the filters being dirty. It’s a good idea to scan the panel for any loose wires or evidence of other issues. Check the wiring to your furnace's thermostat. We have a new furnace (Sept 2012), and I bought a new thermostat after the issue. 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. If your furnace fan won’t turn off, you most likely have one of these 3 problems: Your furnace fan limit switch is set to “manual override” The fan limit switch is faulty and needs to be replaced There’s a problem in your thermostat wiring the burner is burning. Replaced stat. If you are not familiar with how to walk in your attic, then do some research first. Thanks! Your furnace needs to vent properly to function properly. Look on the exterior sides of your furnace for a light switch. Click to Enlarge – Excerpt Page 3 of 12 from the HVAC Design & Consultation Program. In case the furnace turns off when the thermostat is turned to off, a probable reason is a thermostat that is not working properly. Also, be sure to check the batteries so in the event that there is a power failure you won’t lose all your settings. Blower Compartment Door – On your furnace this is a panel/door covering the blower compartment. Turn on the Heat switch. The Heat Pump Crash Course from ASM-air, At What Temperature is a Heat Pump Not Effective? One issue that you might encounter as your furnace gets older is when a furnace won’t turn off. I then turned the system to "OFF" and nothing happened... it kept running. The fan switch on the thermostat is in the auto position, not the on position. Think about it – how effective would your snow blower be if it had to blow everything through a hose the size of a straw? We want to make sure everyone's questions are answered. Both are easy remedies, however, if neither is the case, contact us as soon as you can to speak to a professional and schedule service for your unit. Your consent is not a condition to purchase any product or service. Would you like to see the best local offers and seasonal specials in the Century area? I ended up having to shut the furnace off … All Systems Mechanical services Santa Clarita and Greater Los Angeles down to San Diego. 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. It fires right back up even if the thermostat is disconnected. The thermostat still turns the heat on and off but the fan doesn't go off when the heat goes off. You tried turning the thermostat to the off position, nothing works. However, if the thermostat is properly adjusted and the heat still won’t turn off, there are other mechanical issues that will likely require professional attention. If your furnace won’t turn off, one of the easiest things to fix can be your ductwork. Thermostats will often fail after a number of years of use. HVAC Installation Cost 2019 - What's a Fair Price for a New Heating and Air Conditioning Installation? Test it by setting the temperature five degrees higher than the temperature of the room; see if it comes on (any programming can be overridden by holding the temperature up arrow and holding it for several seconds until the called for temperature rises: then hit “hold”). By submitting this form, you consent to receive a call, email, or text from a Check for a blown or tripped fuse. You can think of your blower motor as kind of like a big fan (actually, that’s exactly what it is). Furnace Won't Turn Off - Furnace Troubleshooting. Naval Aviator 2005-2015. Air filter is too dirty. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. Check to make sure that all of the wiring is attached to the receptacles on the back of your thermostat. 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. However, when in doubt, consult a licensed HVAC technician to assist you. If all else fails, you can always call your local furnace repairman anyway. we will generate a comprehensive report for you. 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. cause. If your thermostat’s fan is set to “on,” then this is likely your problem. If your furnace doesn’t have a switch, simply ignore this step and move on to turning off the breaker. The only way to get that pesky fan to stop running is to shut it off at the breaker or the Emergency Shut-off switch. Next morning again woke up to 90 in house. Moving the temp control makes no difference, ONLY toggling the on/off switch on the thermostat will kick on the furnace. Broken blower fan motor. Just check with your significant other first – that’s all I’m saying. i changed the thermostat, disconnected wires from the thermostat while it was running, and then swapped out the honeywell controll panel with a new one. Here are still a few things that you can figure out yourself. Even disconnecting the thermostat altogether won't stop it. If it’s On, try setting it to Auto — this will turn the fan off when the temperature reaches the desired setting. This shuts the furnace down and prevents your thermostat from calling for more heat. Flip that switch to shut down power to the furnace’s fan and motor. Furnace Won’t Shut Off. When the system is working, the thermostat does keep the house properly conditioned. Now my heat will turn on, but not turn off unless switched to off. If the switch isn’t engaged, the system will not respond. Replaced braker and one next to it as it got hot also. Then gently tap the circuit board with the handle of a screwdriver. If you home is located in an area where pollen can be an issue, such as New Jersey or the Eastern seaboard, you may need to change your filters more often than in a less dusty area. Why Is My Air Conditioner Freezing Up? Dirty air filter. Furnace burners won’t turn off. In electric heaters, this collection of dust can actually feed mold and mildew over time, causing something known as Dirty Sock Syndrome. I can turn it off manually at the thermostat but the blower continues to run for a very long time before it shuts down. A representative from NextGen Air (BBB A+ rated) will be calling you shortly to confirm your appointment. The thermostat shorted out, and the heat would not run properly after that. This door, when properly installed, trips a switch that signifies to the system that is sitting correctly. Electric furnace won't shut off when thermostat satisfied [ 3 Answers ] This is an old GE electric furnace. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. in the auto setting, the thermostat clicks like it should turn off, but the hot air continues to blow. 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. 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. Copyright © 2018 Krankenwerks, Inc. All Rights Reserved. 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. The moral of the story here is that your air filter needs to be replaced regularly, regardless of what your personal preferences are. i have a bryant oil furnace that won't shut off. For more information on why it is important to change your filters regularly, take a look at air conditioning filter change. Check whether your fan is set to On or Auto. If you furnace filter is clogged, the airflow will be restricted. Heat Pump Temperature Ranges. This can be frustrating, but take your time and you can figure it out. 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. There is a reason for this – it works! Sometimes birds and rodents use vent openings to make a nest so this step is particularly important in the spring and summer months. Gets up tp 90 degree. For more on this, try: should I have my air ducts cleaned? 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. 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. Ensure this hasn’t happened. Look, if you’ve tried all of these steps, and you still can’t repair it, then it just might be time. Was working fine. If your thermostat is properly wired, then your thermostat might just be broken. Your furnace will run until it … 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. 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