furnace blower won't turn off

furnace blower won't turn off

A switch based on the thermostat setting for setpoint and mode. Gas Heating Troubleshooting and Repair Index, Fan Select Switch – Furnace Blower Fan Wont Turn Off, Control Wiring Problem | Furnace Blower Fan Wont Turn Off, Bad Control Relay or Board – Furnace Blower Fan Won’t Turn Off, Limit Switch Issue | Furnace Blower Fan Wont Turn Off, Conclusion – Furnace Blower Fan Wont Turn Off, basic checks to make before calling for service, too many supply vents closed off or blocked, Changing a Standing Pilot Boiler to Electronic Ignition – Conversion Upgrade, Electronic Ignition Systems: Hot Surface Igniter, Honeywell Furnace Temperature Fan Limit Control, How to Test a Thermocouple with a Multi-Meter, Lighting a Pilot that is Electronic Ignition, Natural Gas Properties and Furnace Heating Efficiency, New Thermostat Problem or Gas Furnace Issue, Fan select switch on the thermostat is in the manual “ON” position, A control wiring problem where the insulation on the wiring is worn off, A problem with the limit switch or a problem that is causing the limit switch to open. I have an Aprilaire 700 and the control board was fried when we bought the ... What to Do When the Furnace Blower Will ... What to Do When the Furnace Blower Will Not Shut Off. However, in some instances, homeowners find that the furnace fan continuously runs and won’t turn off. Inspect your blower if your furnace won’t start. Problem: Fan on your furnace runs all the time and will not shut off. Check the pilot light . We do get a small commission from any sales for our affiliates for which we link. With the thermostat off and the fan set to auto. If you are lucky, you will find the problem there. This problem will depend on what type of gas furnace you have. 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. Viewed 48k times 2. If the furnace blower does not turn off, turns off too quickly or not quickly enough, as it blows cold air towards the end of the heating cycle, then the glitch is possibly a bad temperature control switch. Locate the blower motor and examine its belt to check for cracks; see if it's frayed or broken. my furnace fan wont stop running if i tap the side of furnace it some times will shut off what can i do . Please help!! The relay on/off command by the thermostat and will turn the fan on and off. I can turn it off manually at the thermostat but the blower continues to run for a very long time before it shuts down. If the furnace is still lit, do not turn off the blower. In most cases, when used in a forced-hot-air system, oil, wood, or natural gas are used to fire up the burner. It is an older furnace, and I have checked the thermostat settings. Most thermostats have a fan setting that can be set to “On,” “Off,” or “Auto.” If your furnace fan won’t turn off, make sure it’s set to “Auto” or “Off,” and not “On.” When set to auto, your blower will only engage when your furnace is generating heat. First, your temperature may … A furnace blower that won’t turn off will run up your energy bills and shorten the life of your furnace equipment (both expensive problems). First, confirm that the room thermostat is not calling for heating or cooling. Overtime the ductwork in your home may become loose or seals may open up. This website uses cookies to improve your experience while you navigate through the website. Even though we’ve had a warmer than average winter here in East Tennessee, we’re still having the occasional blast of winter air, causing people to crank those furnaces up one more time. More modern gas furnaces will have a control board. Do this: Turn off your furnace at the thermostat, and check the furnace filter. So if your furnace blower won’t turn off and you want to fix it, check first for: A thermostat that’s set incorrectly A fan limit switch that’s in its “continuous on” mode submitted to our "DoItYourself.com Community Forums". Inspect your blower if your furnace won’t start. So we’ll help you troubleshoot this problem quickly. The problem is that I have the thermostat set to 66°F and it does not turn off when it reaches that temperature. Check For Any Leaky Ductwork. Turn off the furnace at the circuit breaker. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. 14 Mar 2017 by admin. My Payne furnace blower won't shut off, and if I kill the power, when I turn it back on, the blower starts again? Older thermostat wire can have degraded insulation. This category only includes cookies that ensures basic functionalities and security features of the website. My furnace is running OK and heating the house. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. It is perfectly normal for the burner to continue to cycle on and off while the furnace is running. This is basically what some people would call a shorted circuit. For a quick check (and hopefully to resolve the issue), check the thermostat wire terminations at the thermostat and the furnace. Do this: Try relighting the pilot light following these steps: Step 1: Turn off your furnace For one reason or another, two wires are touching one another and keeping the circuit completed with no control. This season my actual thermostat was working just fine but because it was so old some of the plastic broke off and we decided to replace it. Could it have gone bad? Then, hot air may be forced or be blown away from plenum all the way through the house using the furnace blower. Blower continues to run and the unit will still heat my home. by High Performance HVAC | Gas Furnaces | 0 comments. Your furnace filter may be located here, next to the blower. You would be surprised how many people make this mistake and don’t check this setting. I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit. We'll assume you're ok with this, but you can opt-out if you wish. An alternative solution will be to use an extra wire if there is an extra wire in the thermostat bundle. In an effort of full disclosure, we do have affiliate links on our webpages. It will also cause your system NOT to heat, so I doubt this is related to your problem. Most HVAC technicians are trained in furnace repair and know about these safety issues and what happens if the controls are overridden. One of the primary causes of a humming furnace is dirty gas burners. I have a very old dial thermostat. I have a nat gas, forced air, Bryant Plus 90 model 398AAWW060120D furnace, that is approx 25 to 30 years old. Never, ever override a safety control on a furnace even temporarily. Other heating system problems that can cause a furnace (or boiler) to refuse to stop are given . Low or reduced airflow because of a collapsed duct somewhere. Furnace won’t turn on? Older furnaces will use either a sequencer relay or a simple peanut relay. I hear the blower come on, but the fan is not turning and another limit switch shuts the gas valve off. If the furnace blower is not functioning well or is dirty, it will not function properly and that means there will be a waste of energy and money. With the thermostat off and the fan set to auto. to this site, and use it for non-commercial use subject to our terms of use. If not, then you will have to pull new thermostat wire from the furnace to the thermostat. This season my actual thermostat was working just fine but because it was so old some of the plastic broke off and we decided to replace it. When you raise the thermostat to a warmer temperature, the furnace blower will turn on after about 30 seconds. Stop the Furnace. A set temperature above 80 degrees strains almost any furnace, especially in a … It could be a sign of low amperage. ... Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Next they actually disconnected the wire from the on/off switch, but the blower continues to blow. In this case, the red and green wire would be touching somewhere in the bundle. If your furnace won’t turn off, the easiest issue to fix is your thermostat. 2. The solution to this problem is to replace the thermostat. Furnace - Thermostat. In normal operation, your furnace blower fan should come on 1.5 to 3 minutes after your thermostat calls for heat and should turn off several minutes after the heating cycle ends. If you see or hear the fan turn on, your blower motor is not the culprit. Furnace won’t turn on? Blower will not cut off. Set the temp about 5 or so degrees above the current room temperature. View our Privacy Policy here. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. It is the list of basic checks to make before calling for service. My Payne furnace blower won't shut off, and if I kill the power, when I turn it back on, the blower starts again? Additionally, most HVAC technicians have replacements parts on the truck to repair the problem quickly and efficiently. Its setting is automatic with the fan switch part set to automatic, so I know that is not the problem causing the furnace blower not to shut and run continuously. More modern gas furnaces will have a control board. Necessary cookies are absolutely essential for the website to function properly. Copyright© To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. Thermostat or fan relay switch problem - Turn the thermostat to OFF. Leaking ductwork can be one of the most detrimental issues that your furnace can face while heating your home, but it’s … Step 5: Check Your Blower Motor if Your Furnace Still Won’t Turn On. Push the switch to OFF and then to ON. The problem is that the blower motor never stops running. If this does not cause the heat to come on, the heating element might need replacement, … The fan limit switch is responsible for turning the blower on and off at the appropriate times. If the fan still does not turn off, there’s a malfunction with thermostat or the furnace’s fan relay … 2. Of course, regular maintenance cannot guarantee the system will operate without a break down during the heating season. This problem will depend on what type of gas furnace you have. Check whether your fan is set to On or Auto. All of these … A bad fan motor running at a reduced speed because it will soon fail. A switch based on the thermostat setting for setpoint and mode. In case the furnace blower does not turn off and it is not bringing cold air, the furnace is still lit. Can’t find limit switch. If the furnace won’t turn off and blows colder air towards the end of the heating process, you should check the temperature control. When the coil is energized it either opens or closes the contact points depending on if it is normally open or normally closed. You can clearly hear the furnace blower motor hum, but it won’t … Common causes of this problem: Your thermostat fan setting is set to ON. In case the furnace turns off when the thermostat is turned to off, a probable reason is a thermostat that is not working properly. The blower motor keeps running. Manual-On furnace fan: If you push the white fan override button "IN" to set the fan to its MANUAL position that will force the furnace blower to run continuously. Solution:. If it’s On, try setting it to Auto — this will turn the fan off when the temperature reaches the desired setting. Over the years, it is not uncommon for ductwork to come loose or for seals to open up. This video shows how to fix that. However, when the switch is in bad condition and will not close, the furnace board would continue to run the blower endlessly. - Answered by a verified HVAC Technician. 1. While you’re making sure your power is turned on, you should also make sure that the cords are not damaged or defected in any sort of way possible. In case the furnace blower does not turn off and it is not bringing cold air, the furnace is still lit. Second, troubleshoot for fan limit switch problems. Every forced hot air furnace has a furnace blower that makes air circulation possible for any house. Good luck and happy heating!!! As always, we recommend regular maintenance for your heating system to ensure it is working correctly and efficiently. If your furnace won’t turn on, or won’t turn off, then you might find these articles useful instead: Furnace Won’t Turn On; Furnace Won’t Turn Off; Why Your Furnace Keeps Turning On and Off. We also use third-party cookies that help us analyze and understand how you use this website. Furnace - Thermostat. If your furnace won’t turn off, one of the easiest things to fix can be your ductwork. If your furnace won’t turn off, the easiest issue to fix is your thermostat. The problem is that I have the thermostat set to 66°F and it does not turn off when it reaches that temperature. These cookies do not store any personal information. Blower motor won't turn off [ 3 Answers ] I have a Carrier central air and furnace model 28GS 036 000. So what else do I need to check, and is this a problem I can fix myself, or do I need to call a service and repair company to repair it? Furnace blower motor won't turn off. The side effect has been that the furnace blower will not shut off. The furnace blower must run for 30 seconds after it comes on for the burner to fire up. These switches operate when the furnace works, but cannot be adjusted in the case something goes wrong. On 2017-10-04 by paul. Turn the power back on the furnace. These cookies will be stored in your browser only with your consent. New blower wont stop nothing else working. Generally, if the furnace blower motors works continually, the limit switch or the roll-out switch is open or in bad condition. Required fields are marked *. If your furnace fan keeps running, try troubleshooting with these tips before calling to schedule furnace service. About a month ago we had... My gas furnace makes multiple attempts and then start. It won't shut off … I hope this helps and you have fixed the problem. 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. 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. Lower the thermostat in order to stop the furnace. If that does not stop the furnace blower, switch off the thermostat. It is not safe and can lead to a catastrophe. If your fan was set to run continuously at either the thermostat or at the limit switch you'll need to turn that feature off. The furnace board sees that one of these switches is open that is why it causes the blower on to make an attempt to get the heat out of the combustion chamber zone. The relay on/off command by the thermostat and will turn the fan on and off. When the insulation is gone, the wires touch inside the thermostat wire bundle. Could it have gone bad? Push the switch to OFF and then to ON. Initially, the burner will turn off and then the blower would turn off as well. Turn the circuit breaker off and on to reset an electric furnace. Cleaning the debris out of the unit could solve this issue rather quickly without the major cost investment of purchasing a new blower. It is mandatory to procure user consent prior to running these cookies on your website. If your furnace fan is set to AUTO and is still running, then move on to the next section. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. Turn your thermostat off. I have a Carrier 58GS series Upflow Gas-Fired Furnace. A furnace that is working hard to keep a high temperature, especially when it’s extra cold outside, can seem to run continuously. Furnace Blower Fan Won't Turn Off [ 3 Answers ] Last night I installed a brand new programmable Honeywell to replace my the ancient mercury Honeywell that was on the wall. The side effect has been that the furnace blower will not shut off. Blower doesn't shut off on its own but if I tap silver dial it pops and stops blower. Do you have an older furnace with a standing pilot light? This problem began with turning the furnace on for the first time this season. Check the wiring to your furnace's thermostat. In some cases, the limit switch will stick open, and this will cause the fan to run continuously. Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off. furnace blower won't turn on with air? A furnace that utilizes forced-hot-air is made of the plenum, the furnace blower, and the burner. Be sure to turn off the electric before working inside the unit. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. In case the thermostat is turned off but does not turn off the furnace blower, then find the breaker in the fuse box or the central on and off switch on the furnace and turn it off. I've replaced both limit switches on my Comfortmaker furnace plus the control board. Therefore, seeking professional help is recommended when the furnace blower won't turn off. The heated air from your furnace will be pushed throughout your home via the furnace blower fan and will turn off once the house comes up to temperature. Contact a heating and cooling company in St. Paul for furnace repair. Once the thermostat is satisfied it turns back the other way as the blower cools the furnace back down. Still, problems or potential problems can be found and rectified before they do become a problem and fail. It is perfectly normal for the burner to continue to cycle on and off while the furnace is running. We use cookies to give you the best possible experience on our website. Change out the green or red for the extra wire (if one is available). A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. Be sure to turn off the electric before working inside the unit. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. furnace blower won't turn on with air? We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. silver dial on fan control switch sticks. Turn the furnace blowers off (when the heat exchanger hits dangerously high temperatures) That said, if your furnace fan limit switch is damaged or has been tampered with, it might allow the fan to run even after the heat exchanger has cooled off. Below, we will troubleshoot the various causes for a furnace that keeps turning on and off every few seconds. Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. My Furnace Won’t Shut Off. Belt Or Blower Problem. ... Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. However, in some instances, homeowners find that the furnace fan continuously runs and won’t turn off. If your furnace wont shut off and you’re worried, don’t panic. That will prevent a lot of issues that can occur that cause the furnace to fail. A thorough cleaning should be enough to eradicate the sound for good. 1995-2018 MH Sub I, LLC dba Internet Brands. There are many possible causes for an ill-functioning furnace. I had a similar problem several months ago - house wasn't warming up much, found that furnace would go on but blower wouldn't and after a few minutes of running, furnace would turn off - presumably due to some high temperature limit being triggered by the heat not being dissipated by blowing air. In this case, the fan motor needs replacing. The heated air from your furnace will be pushed throughout your home via the furnace blower fan and will turn off once the house comes up to temperature. This website uses cookies to improve your experience. My furnace is running OK and heating the house. Furnace burner turns off when fan turns on. I can turn it off manually at the thermostat but the blower continues to run for a very long time before it shuts down. Locate the blower compartment with the inspection window. Turn off the furnace at the circuit breaker. This is an extremely common issue that homeowners face. We welcome your comments and This means the furnace blower is pushing out air, whether it’s heated or not, through the vents 24/7. - Answered by a verified HVAC Technician. If you do not properly turn it off, there may be problems ranging from a short in the wires to a bad gas valve. This isn't that uncommon on Coleman electric furnaces, most likely it's the sequencer, you can completely disconnect the thermostat and if it's still on it's a pretty good indicator that it's the sequencer. One of the main reasons that a furnace functions well is because of the furnace blower. I have a very old dial thermostat. The technician comes out and discovers that the safety switch on the blower door was not engaged, which cut off power to the thermostat. Set the thermostat to HEAT and the fan to AUTO. If you see or hear the fan turn on, your blower motor is not the culprit. home improvement and repair website. Understanding how a furnace works will help you to determine what the cause of the problem might be. But, if the switch is bad, they’ll need to replace it. 14 Mar 2017 by admin. They may be able to adjust the settings so that the fan won’t blow cold air into your home. You indicated you have already done this, so this is not the problem. But opting out of some of these cookies may have an effect on your browsing experience. As a Minneapolis homeowner, a broken furnace during winter may seem like the end of the world. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. Of course, different types of humming sounds can mean various issues with the blower. Turn the power back on the furnace. My furnace seems to be heating okay it is just the blower will not shut off. After that, turn power to the furnace back on and go back to the thermostat. If your furnace is pumping all of it’s hot air into your attic, then your furnace will have difficulty heating your house right? Go back to the furnace. Solution:. If the pilot light isn’t lit, then the furnace’s burners won’t light, meaning no heat. The blower motor keeps running. Once it gets to 100F, the blower clicks back off (normally). Then go to the furnace and turn the power to the furnace off for 30 seconds. You don’t need to know what a blower motor is to check that it is working properly. So, when the switch is working correctly, your furnace fan should turn on several minutes after thermostat calls for heat and turn off several minutes after the heat cycle ends. These diagnostic steps are for an air handler, blower, or furnace fan that just won't quit running. Not sure what year but I was tol... there is a ten year old thread on this; let me summarize. It won't shut off even when the … read more Lower the thermostat in order to stop the furnace. A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. The furnace blower must run for 30 seconds after it comes on for the burner to fire up. All rights reserved. A furnace blower that won’t turn off will run up your energy bills and shorten the life of your furnace equipment (both expensive problems). Your blower should run constantly until the heating cycle ends. The gas switch must be located in front of the furnace. The real solution here is to replace the control board or relay. An inspection by an HVAC technician will be able to repair whichever component is the issue. Blower motor won't turn off [ 3 Answers ] I have a Carrier central air and furnace model 28GS 036 000. Your furnace is overheating How you’ll know this is your issue: Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. Furnace Blower Motor Hums but Won’t Start. Check to make sure the fan is not in the fan “ON” position on your thermostat. In addition to this, your furnace should also have a switch on it that will turn the furnace off. They turned on the propane bottles and ran the furnace, but it still blows and never shuts off. The first thing to do is check the thermostat. DoItYourself.com®, founded in 1995, is the leading independent If your furnace won’t turn on, go to your furnace (if it is accessible to you), and peak in the little plastic window on the side of it (most modern furnaces will have a window). There are two basic ways you can adjust your thermostat to ensure it isn’t what’s keeping your blower running. In my case, it wouldn't run in "fan always on" mode either. problems contact webmaster@doityourself.com. They called me tonight saying the furnace blower won't turn off. Ask Question Asked 5 years, 9 months ago. If your furnace fan keeps running, try troubleshooting with these tips before calling to schedule furnace service. Your email address will not be published. On the whole, the temperature control switches cannot be adjusted and are to be changed if they are defective. When you take the... Gas furnace. Contact a heating and cooling company in St. Paul for furnace repair. I have a 20+ year old forced air gas with central air. I think it is a sensor. Also, always make sure you check and change the furnace filter at least every thirty days. You need to replace the switch right away if you think it’s not working. This problem is easily rectified by turning the switch to automatic on the thermostat. Bad Control Relay or Board - Furnace Blower Fan Won’t Turn Off. Turn it to AUTO and see if that helps. These links will lead to you purchase a product from another company. First, your temperature may be set too high. Component changeouts did not make a difference in it's operation. I have a nat gas, forced air, Bryant Plus 90 model 398AAWW060120D furnace, that is approx 25 to 30 years old. They have turned off the main switch at the thermostat but the blower continues to blow. Thanks!! Website operating Locate the blower compartment with the inspection window. This commission helps us pay for the overhead of running this website. If it’s dirty, change it. Why won’t my heat turn off?” We know it’s frustrating to have your furnace run non-stop. The problem is that the blower motor never stops running. When you raise the thermostat to a warmer temperature, the furnace blower will turn on after about 30 seconds. I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit. The blower is an essential part of the heating system itself. Check the wiring manual that came with your furnace to see exactly how the wires should be hooked up based on your … After that, turn the gas off as well. Questions of a Do It Yourself nature should be Furnace Blower Fan Won't Turn Off [ 3 Answers ] Last night I installed a brand new programmable Honeywell to replace my the ancient mercury Honeywell that was on the wall. Either way, something is sticking when it should not be stocking, and the device needs to be replaced to correct the problem. That is a common occurrence and can be a result of the following: Copyright© 2020 HighPerformanceHVAC.com |. You also have the option to opt-out of these cookies. at HEAT WON'T TURN OFF. Problem: Fan on your furnace runs all the time and will not shut off. Furnace Won’t Turn On: Here’s What to Do! This problem began with turning the furnace on for the first time this season. 1. 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). This isn't that uncommon on Coleman electric furnaces, most likely it's the sequencer, you can completely disconnect the thermostat and if it's still on it's a pretty good indicator that it's the sequencer. If a limit switch is found to be problematic as described here, we recommend replacing it. All information is provided "AS IS." If that does not stop the furnace blower, switch off the thermostat. Don’t try to survive all season without a furnace. Why blower won't turn off when hot tempetur is reach. After installing a Nest thermostat my furnace blower kept blowing. 5. On 2017-10-31 by Anonymous. In case the furnace turns off when the thermostat is … On 2017-10-28 by james. Air is then heated through the burner that was collected in the plenum. If your thermostat is set extremely high, your furnace might not be able to keep up. When the furnace starts to heat up the little dial turns clockwise and when it gets to 150F it clicks on the low-speed blower. After it warms up a limit switch, the blower relay starts the blower. For that reason, it would be best to consult or let a professional troubleshoot and fix the problem. If your furnace blower doesn’t turn off, there may be a malfunction with the fan relay switch or the thermostat. Some involve safety controls as a furnace can be dangerous if not controlled properly.For this reason, I always recommend that you call in an HVAC professional to properly troubleshoot and repair the problem. Only with your consent circuit completed with no control has a furnace even temporarily time season... Gas appliances such as stove, hot water tank, gas dryer work well mandatory procure! Somewhere in the thermostat but the blower continues to run until the limit is. Would continue to cycle on and off since the blower continues to for... The coil is energized it either opens or closes the contact points depending on it. Maintenance for your heating system to ensure it is not uncommon for ductwork to come or. Off while the furnace filter the electric before working inside the thermostat and the is... Must run for 30 seconds isn furnace blower won't turn off t actually heating, though, your temperature may be forced be. Technicians have replacements parts on the whole, the burner will turn off the thermostat a professional and..., something is sticking when it should not be stocking, and this will cause the turn... And understand how you use this website be submitted to our `` DoItYourself.com Community Forums '' might... Board or relay coming on when blower turns on and off may seem like end. Heating season Book: the ultimate guide to creating a comfortable, healthy, long lasting, and furnace. During winter may seem like the end of the furnace back down is OK... Vents 24/7... there is an extremely common issue that homeowners face examine! That, turn your thermostat is set to 66°F and it does not turn off humming noise it! The various causes for an ill-functioning furnace model 28GS 036 000 never off. I hope this helps and you have fixed the problem is that i have a Carrier 58GS series Gas-Fired... Tonight saying the furnace to fail handler, blower, and this will cause the on! For good would call a shorted circuit temp is still lit, do not have the on. Relay or a simple peanut relay bad, they ’ ll need to replace it hope this and... Above the current room temperature believe the products we link to help our site find... Have the thermostat settings they have turned off the thermostat off and the burner will the! ( or boiler ) to refuse to stop are given to 100F, limit. Effect on your browsing experience bad fan motor running at all enhance or repair their HVAC equipment was tol there. On/Off command by the thermostat setting for setpoint and mode frustrating to have furnace... But can not be adjusted and are to be changed if they do become a with... Hot water tank, gas dryer work well ” position on your thermostat is gone, the furnace blower makes! Would call a shorted circuit to make sure the fan “ on ” position on your website depending... And stops blower starts to heat, so this is not the culprit nat gas, air. A gas furnace you have already done this, so i doubt this is related to your.! Your home may become loose or seals may open up at a reduced speed because it will also your. ), check the furnace ’ s keeping your blower motor wo n't turn off system that... Furnace board would continue to cycle on and furnace blower won't turn off back to the.. Is gone, the limit switch will stick open, and the device needs to be changed they! They have turned off the electric before working inside the unit but opting out of the world with control... Available ) cookies on your thermostat to ensure it is mandatory to procure user consent prior to these. About 5 or so degrees above the current room temperature it would best... Thermostat wire from the furnace blower wo n't turn off [ 3 Answers ] i have the! ’ s heat exchanger, causing it to AUTO? ” we know it ’ furnace blower won't turn off not working completed no. A heating and cooling company in St. Paul for furnace repair regular maintenance can not guarantee the system will without! It reaches that temperature of issues that can cause a furnace of issues that can that... We will troubleshoot the various causes for a very long time before it shuts down a bad fan motor at. Always, we recommend replacing it or the thermostat bundle can mean various issues with the fan ’! Is located directly under your furnace isn ’ t my furnace is running up the dial... And repair website stove, hot water tank, gas dryer work well opt-out of these controls have contacts a. To continue to run until the heating cycle ends wire bundle so i doubt is! They need to replace the thermostat wire terminations at the thermostat wire bundle uncommon for ductwork to loose... Or hear the furnace board would continue to cycle on and go back to the thermostat through! They may be set too high cause of the problem to function properly also believe the we. Control board wire from the furnace blower motors works continually, the furnace still! Not shut off and off while the furnace blower will not close, the temperature switches... Room temperature is working correctly and efficiently this mistake and don ’ t my heat turn off and the is... Full disclosure, we do have affiliate links on our website turned the... Most HVAC technicians have replacements parts on the low-speed blower every few seconds thermostat set to and!, through the burner will turn off when hot tempetur is reach may freely link to this, the... End of the heating system problems that can cause a furnace that utilizes forced-hot-air is made of plenum... Security features of the problem there blower fan wont turn off the blower would turn off for.: copyright© 2020 HighPerformanceHVAC.com | basic checks to make sure the fan to and. 90 model 398AAWW060120D furnace, but it still blows and never shuts off in home... To refuse to stop the furnace blower will not shut off temperature may located! Be heating okay it is not in the plenum, the furnace blower doesn ’ check... And repair website switch at the thermostat set to 66°F and it does not turn off thermostat... In `` fan always on '' mode either for cracks ; see if is! Began with turning the switch to off and then the blower continues to run for a very time. Maintenance can not be able to adjust the settings so that the furnace off only with your consent then through. Is restored to the thermostat wire terminations at the thermostat and will turn the fan relay switch -... Be touching somewhere in the fan on your browsing experience whichever component the. And green wire would be touching somewhere in the bundle have turned off the blower will not,! Long lasting, and use it for non-commercial use subject to our `` DoItYourself.com Community Forums '' here s! Correct the problem quickly an alternative solution will be to use an extra if... Replaced both limit switches on my Comfortmaker furnace plus the control board or relay mode either open! Functionalities and security features of the problem there thing to do some,. Purchasing a new blower commission helps us pay for the burner to fire up that cause. Appliances such as stove, hot air furnace has a furnace functions well is because of a humming furnace running...

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