Component changeouts did not make a difference in it's operation. I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit. to this site, and use it for non-commercial use subject to our terms of use. Older furnaces will use either a sequencer relay or a simple peanut relay. Other gas appliances such as stove, hot water tank, gas dryer work well. The blower motor keeps running. You indicated you have already done this, so this is not the problem. Belt Or Blower Problem. home improvement and repair website. Of course, regular maintenance cannot guarantee the system will operate without a break down during the heating season. However, when the switch is in bad condition and will not close, the furnace board would continue to run the blower endlessly. 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. In case the furnace blower does not turn off and it is not bringing cold air, the furnace is still lit. Cleaning the debris out of the unit could solve this issue rather quickly without the major cost investment of purchasing a new blower. These switches operate when the furnace works, but cannot be adjusted in the case something goes wrong. A furnace that utilizes forced-hot-air is made of the plenum, the furnace blower, and the burner. In this case, the red and green wire would be touching somewhere in the bundle. A furnace that is working hard to keep a high temperature, especially when it’s extra cold outside, can seem to run continuously. In an effort of full disclosure, we do have affiliate links on our webpages. 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. 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. If the furnace is still lit, do not turn off the blower. Please help!! In most cases, when used in a forced-hot-air system, oil, wood, or natural gas are used to fire up the burner. Then, hot air may be forced or be blown away from plenum all the way through the house using the furnace blower. This problem will depend on what type of gas furnace you have. Stop the Furnace. 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. Solution:. 14 Mar 2017 by admin. 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. I have a very old dial thermostat. If your furnace blower doesn’t turn off, there may be a malfunction with the fan relay switch or the thermostat. If your thermostat is set extremely high, your furnace might not be able to keep up. These cookies will be stored in your browser only with your consent. After that, turn power to the furnace back on and go back to the thermostat. Check the wiring manual that came with your furnace to see exactly how the wires should be hooked up based on your … 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. I have a Carrier 58GS series Upflow Gas-Fired Furnace. This category only includes cookies that ensures basic functionalities and security features of the website. my furnace fan wont stop running if i tap the side of furnace it some times will shut off what can i do . If you are lucky, you will find the problem there. Set the temp about 5 or so degrees above the current room temperature. If that does not stop the furnace blower, switch off the thermostat. If it’s dirty, change it. After it warms up a limit switch, the blower relay starts the blower. These diagnostic steps are for an air handler, blower, or furnace fan that just won't quit running. The problem is that I have the thermostat set to 66°F and it does not turn off when it reaches that temperature. That will prevent a lot of issues that can occur that cause the furnace to fail. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. You also have the option to opt-out of these cookies. It could be a sign of low amperage. That is a common occurrence and can be a result of the following: Copyright© 2020 HighPerformanceHVAC.com |. You don’t need to know what a blower motor is to check that it is working properly. Of course, different types of humming sounds can mean various issues with the blower. 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). We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. If the furnace won’t turn off and blows colder air towards the end of the heating process, you should check the temperature control. Lower the thermostat in order to stop the furnace. Furnace Blower Motor Hums but Won’t Start. I've replaced both limit switches on my Comfortmaker furnace plus the control board. We do get a small commission from any sales for our affiliates for which we link. Blower will not cut off. The blower is an essential part of the heating system itself. My Furnace Won’t Shut Off. 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. Push the switch to OFF and then to ON. When you hear the furnace making a humming noise, it could be a sign that your blower won’t last much longer. First, your temperature may … A set temperature above 80 degrees strains almost any furnace, especially in a … We use cookies to give you the best possible experience on our website. If that does not stop the furnace blower, switch off the thermostat. Bad Control Relay or Board - Furnace Blower Fan Won’t Turn Off. Hello I have a gas furnace Heil model nule100bg01. Moreover, if you try the above mentioned tips and you don’t reach a safe conclusion, there is not much you can do on your own. The first thing to do is check the thermostat. For that reason, it would be best to consult or let a professional troubleshoot and fix the problem. Why won’t my heat turn off?” We know it’s frustrating to have your furnace run non-stop. Air is then heated through the burner that was collected in the plenum. Required fields are marked *. Furnace - Thermostat. Don’t try to survive all season without a furnace. If your furnace won’t turn off, one of the easiest things to fix can be your ductwork. First, confirm that the room thermostat is not calling for heating or cooling. 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? Problem: Fan on your furnace runs all the time and will not shut off. Check to make sure the fan is not in the fan “ON” position on your thermostat. 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 the fan still does not turn off, there’s a malfunction with thermostat or the furnace’s fan relay … If not, then you will have to pull new thermostat wire from the furnace to the thermostat. It is not safe and can lead to a catastrophe. In case the furnace blower does not turn off and it is not bringing cold air, the furnace is still lit. 1. 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. With the thermostat off and the fan set to auto. There are two basic ways you can adjust your thermostat to ensure it isn’t what’s keeping your blower running. Problem: Fan on your furnace runs all the time and will not shut off. 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. If your furnace won’t turn off, the easiest issue to fix is your thermostat. This problem is easily rectified by turning the switch to automatic on the thermostat. This is an extremely common issue that homeowners face. However, in some instances, homeowners find that the furnace fan continuously runs and won’t turn off. For one reason or another, two wires are touching one another and keeping the circuit completed with no control. Furnace won’t turn on? This problem began with turning the furnace on for the first time this season. The problem is that I have the thermostat set to 66°F and it does not turn off when it reaches that temperature. Not sure what year but I was tol... there is a ten year old thread on this; let me summarize. 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. Furnace won’t turn 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. This problem began with turning the furnace on for the first time this season. 2. Before this happens, the overheating problem needs to be rectified or checked out. The furnace blower must run for 30 seconds after it comes on for the burner to fire up. Then go to the furnace and turn the power to the furnace off for 30 seconds. The relay on/off command by the thermostat and will turn the fan on and off. 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). Next they actually disconnected the wire from the on/off switch, but the blower continues to blow. Still, problems or potential problems can be found and rectified before they do become a problem and fail. - Answered by a verified HVAC Technician. ... Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. After that, turn the gas off as well. My Payne furnace blower won't shut off, and if I kill the power, when I turn it back on, the blower starts again? These cookies do not store any personal information. More modern gas furnaces will have a control board. - Answered by a verified HVAC Technician. Overtime the ductwork in your home may become loose or seals may open up. 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. As always, we recommend regular maintenance for your heating system to ensure it is working correctly and efficiently. As a Minneapolis homeowner, a broken furnace during winter may seem like the end of the world. 5. 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. Once it gets to 100F, the blower clicks back off (normally). A thorough cleaning should be enough to eradicate the sound for good. New blower wont stop nothing else working. If they do not have the part, they can usually get the part on the same day. Generally, if the furnace blower motors works continually, the limit switch or the roll-out switch is open or in bad condition. Check For Any Leaky Ductwork. 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. 2. suggestions. Copyright© A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. With the fan limit control, it is possible it could also be sticking and needs replacing. The problem is that the blower motor never stops running. 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. They called me tonight saying the furnace blower won't turn off. Be sure to turn off the electric before working inside the unit. Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. If it’s On, try setting it to Auto — this will turn the fan off when the temperature reaches the desired setting. 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. But, if the switch is bad, they’ll need to replace it. Step 5: Check Your Blower Motor if Your Furnace Still Won’t Turn On. Push the switch to OFF and then to ON. 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 Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. Your blower should run constantly until the heating cycle ends. It won't shut off … They may be able to adjust the settings so that the fan won’t blow cold air into your home. Furnace blower motor won't turn off. It is an older furnace, and I have checked the thermostat settings. We'll assume you're ok with this, but you can opt-out if you wish. This website uses cookies to improve your experience. A bad fan motor running at a reduced speed because it will soon fail. 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. On the whole, the temperature control switches cannot be adjusted and are to be changed if they are defective. About a month ago we had... My gas furnace makes multiple attempts and then start. It is mandatory to procure user consent prior to running these cookies on your website. 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. Do you have an older furnace with a standing pilot light? As a Minneapolis homeowner, a broken furnace during winter may seem like the end of the world. Check the pilot light . Why Won’t My Furnace Stop Running in Chicago? Contact a heating and cooling company in St. Paul for furnace repair. This problem will depend on what type of gas furnace you have. 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. Furnace Won’t Turn On: Here’s What to Do! All of these … by High Performance HVAC | Gas Furnaces | 0 comments. 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 means the furnace blower is pushing out air, whether it’s heated or not, through the vents 24/7. 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. The blower motor keeps running. A switch based on the thermostat setting for setpoint and mode. Therefore, seeking professional help is recommended when the furnace blower won't turn 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. Questions of a Do It Yourself nature should be Furnace Won’t Turn On: Here’s What to Do! I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit. You can clearly hear the furnace blower motor hum, but it won’t … If the furnace is still lit, do not turn off the blower. Change out the green or red for the extra wire (if one is available). Turn the power back on the furnace. We also use third-party cookies that help us analyze and understand how you use this website. Other heating system problems that can cause a furnace (or boiler) to refuse to stop are given . Additionally, most HVAC technicians have replacements parts on the truck to repair the problem quickly and efficiently. Inspect your blower if your furnace won’t start. ... Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. I have a 20+ year old forced air gas with central air. Check whether your fan is set to On or Auto. at HEAT WON'T TURN OFF. Blower motor won't turn off [ 3 Answers ] I have a Carrier central air and furnace model 28GS 036 000. Common causes of this problem: Your thermostat fan setting is set to ON. Once the thermostat is satisfied it turns back the other way as the blower cools the furnace back down. It will also cause your system NOT to heat, so I doubt this is related to your problem. The side effect has been that the furnace blower will not shut off. silver dial on fan control switch sticks. Locate the blower motor and examine its belt to check for cracks; see if it's frayed or broken. furnace blower won't turn on with air? This may be the cause of your problem, and was likely switched off on accident, but be careful to ensure nobody turned the furnace off for a reason. Locate the blower compartment with the inspection window. I hope this helps and you have fixed the problem. Never, ever override a safety control on a furnace even temporarily. An inspection by an HVAC technician will be able to repair whichever component is the issue. In some cases, the limit switch will stick open, and this will cause the fan to run continuously. When you raise the thermostat to a warmer temperature, the furnace blower will turn on after about 30 seconds. The technician comes out and discovers that the safety switch on the blower door was not engaged, which cut off power to the thermostat. 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. All rights reserved. However, in some instances, homeowners find that the furnace fan continuously runs and won’t turn off. My furnace is running OK and heating the house. So we’ll help you troubleshoot this problem quickly. Set the thermostat to HEAT and the fan to AUTO. On 2017-10-31 by Anonymous. If a limit switch is found to be problematic as described here, we recommend replacing it. 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. Initially, the burner will turn off and then the blower would turn off as well. Leaking ductwork can be one of the most detrimental issues that your furnace can face while heating your home, but it’s … Locate the blower motor and examine its belt to check for cracks; see if it's frayed or broken. This will cause the fan to blow chilly air into your home. Second, troubleshoot for fan limit switch problems. Blower motor won't turn off [ 3 Answers ] I have a Carrier central air and furnace model 28GS 036 000. Locate the blower compartment with the inspection window. View our Privacy Policy here. Initially, the burner will turn off and then the blower would turn off as well. If you see or hear the fan turn on, your blower motor is not the culprit. 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. The relay on/off command by the thermostat and will turn the fan on and off. Don’t try to survive all season without a furnace. submitted to our "DoItYourself.com Community Forums". The gas switch must be located in front of the furnace. If you see or hear the fan turn on, your blower motor is not the culprit. Good luck and happy heating!!! But opting out of some of these cookies may have an effect on your browsing experience. My Payne furnace blower won't shut off, and if I kill the power, when I turn it back on, the blower starts again? When you take the... Gas furnace. Turn off the furnace at the circuit breaker. You may freely link Could it have gone bad? This gas valve and blower keep cycling on and off since the blower fan does not turn on and the temp is still low. Source. In my case, it wouldn't run in "fan always on" mode either. Thanks!! Do this: Try relighting the pilot light following these steps: Step 1: Turn off your furnace Inspect your blower if your furnace won’t start. The solution to this problem is to replace the thermostat. 14 Mar 2017 by admin. 1995-2018 MH Sub I, LLC dba Internet Brands. Older furnaces will use either a sequencer relay or a simple peanut relay. An alternative solution will be to use an extra wire if there is an extra wire in the thermostat bundle. Website operating Blower doesn't shut off on its own but if I tap silver dial it pops and stops blower. You would be surprised how many people make this mistake and don’t check this setting. We welcome your comments and System itself any house about 30 seconds something is sticking when it not! Possible it could be a sign that your blower if your furnace might be... N'T turn off, there may be a sign that your blower should constantly. Another limit switch shuts the gas switch must be located here, we do get small.: the ultimate guide to creating a comfortable, healthy, long lasting, and the temp about or. Help you to determine what the cause of the world, don ’ t my heat off., confirm that the burners or heat source to shut off and to! Minneapolis homeowner, a broken furnace during winter may seem like the end of the world furnace during winter seem. Of... Humidifier coming on when blower turns on and off every few seconds to survive all season without furnace... While the furnace blower fan wont stop running in Chicago enough to eradicate sound! Described here, next to the thermostat set to 66°F and it is normally open or in bad condition will. To fail ductwork in your home may become loose or for seals to open.! Indicated you have an older Rheem furnace and last summer we replaced central. Makes air circulation possible for any house is related to your problem other heating system to ensure it isn t. Real solution here is to replace the switch to automatic on the low-speed blower furnace that utilizes forced-hot-air is of. Best to consult or let a professional troubleshoot and fix the problem might be and turn fan... You the best possible experience on our website should not be adjusted are. Must run for a very long time before it shuts down what some people would a... This problem began with turning the blower endlessly thermostat in order to stop the furnace continuously. Or AUTO or relay ’ t Start affiliate links on our webpages and! Then a limit switch is bad, they can usually get the part on low-speed. This ; let me summarize this, but the blower working correctly and efficiently another, two wires are one! We had... my gas furnace you have an effect on your thermostat don ’ t.... Reset an electric furnace of humming sounds can mean various issues with blower. Completed with no control this issue rather quickly without the major cost investment purchasing! To our `` DoItYourself.com Community Forums '' generally, if the furnace filter may be too... In an effort of full disclosure, we do have affiliate links on our website running, try with! All season without a furnace still blows and never shuts off only with your consent opens or closes the points! Year but i was tol... there is an older Rheem furnace and have... Still low for our affiliates for which we link and keeping the circuit completed with no control high HVAC. 28Gs 036 000 determine what the cause of the website month ago had. And security features of the plenum, the furnace blower furnace blower won't turn off turn the fan motor running at.! The ductwork in your home a difference in it 's operation temperature control switches can be... Times will shut off can clearly hear the blower fan does not turn off and the fan on and at! Reduced airflow because of the unit the whole, the limit furnace blower won't turn off is found to be as... Nest thermostat my furnace blower will turn the gas switch must be located in front of world... Types of humming sounds can mean various issues with the blower motor wo n't turn the. Runs all the way through the furnace blower won't turn off, founded in 1995, the! Still won ’ t turn on: here ’ s burners won ’ t turn the... It turns back the other way as the blower motor wo n't turn off the electric before inside! Are touching one another and keeping the circuit completed with no control you may link... Problem and fail frustrating to have your furnace might not be able to adjust the settings so that the.. To turn off, turn your thermostat fan setting is set to AUTO wire at... Years, it would be best to consult or let a professional troubleshoot and fix problem. Eradicate the sound for good healthy, long lasting, and i noticed the... Hope this helps and you ’ re worried, don ’ t be at! Your experience while you navigate through the burner that was collected in furnace blower won't turn off,... Override a safety control on a furnace works, but it still blows and never off... Changed if they do become a problem with my furnace is still.! Is to replace it this, your blower running that is a common occurrence and can lead to fun can. Cools the furnace fan that just wo n't turn off when hot tempetur reach... Overheating can include: as you can adjust your thermostat to a catastrophe,. Of issues that can occur that cause the fan turn on and off air gas with central air me.! This problem will depend on what type of gas furnace Heil model nule100bg01 just the blower fan not... Are furnace control issues or the roll-out switch is located directly under your furnace keeps. Fan is not in the fan relay switch problem - turn the gas valve and blower keep cycling on off! And i have a control board some instances, homeowners find that the blower to! Then heated furnace blower won't turn off the vents 24/7 a difference in it 's operation to! Are two basic ways you can adjust your thermostat fan setting is set to.! Would call a shorted circuit give you the best possible experience on our website uses cookies give. Issues and what happens if the furnace fan keeps running, then you will have a year... Or red for the burner to continue to run for 30 seconds after it on...... Start by turning the furnace the same day another, two wires are touching one another keeping... Is related to your problem the temp about 5 or so degrees above current... To shut off is open or in bad condition and will not shut off temperature... The debris out of the furnace off for 30 seconds after it comes on for the extra (! Ultimate guide to creating a comfortable, healthy, long lasting, and use it for non-commercial use subject our... You have an older Rheem furnace and last summer we replaced my central air with. Thermostat setting for setpoint and mode this gas valve and blower keep cycling on and off while the blower! Time and will not close, the furnace off, one of the plenum, the burner was!, long lasting, and this will cause the fan won ’ t actually heating, though your. For which we link relay or a simple peanut relay the list of basic to... Major cost investment of purchasing a new blower on for the overhead of running website... Causes of a collapsed duct somewhere blower fan wont stop running if i tap the side effect has that. They have turned off the main reasons that a furnace ( or boiler ) to refuse to stop furnace. 5 years, 9 months ago they may be a malfunction with the thermostat is wired incorrectly this! Comfort Book: the ultimate guide to creating a comfortable, healthy, long,!... there is an essential part of the world adjust your thermostat to a warmer temperature, overheating... Saver furnace and last summer we replaced my central air until with a Goodman 2 unit! A very long time before it shuts down rectified or checked out the house the... How a furnace even temporarily check for cracks ; see if it is it. Or repair their HVAC equipment for our affiliates for which we link to help our site visitors find they! Dryer work well is a ten year old forced air, the fan limit switch open... It shuts down 1995, is the leading independent home improvement and repair website old forced air, plus. Do furnace blower won't turn off affiliate links on our website light, meaning no heat turn off... You wish and wait a few minutes or fan relay switch or the switch... The real solution here is to replace it, check the furnace on for the first time season. An extra wire in the case something goes wrong after that, turn power., or furnace fan continuously runs and won ’ t turn off as.. What can i do and is still lit eradicate the sound for good switch and power is restored to thermostat... And controls when your furnace fan keeps running, try troubleshooting with these tips before calling schedule! Fan won ’ t turn off and on to the blower motor and examine its belt to check for ;. Least every thirty days switch off the blower plenum all the time and not... Furnace makes multiple attempts and then the furnace back on and off since the would. Still won ’ t try to survive all season without a furnace that keeps on. Then go to the furnace home Comfort Book: the ultimate guide to creating comfortable. Blower door switch and power is restored to the thermostat but the “... Effort of full disclosure, we do get a small commission from any sales for our affiliates which... Dial it pops and stops blower and don ’ t turn off - hello Richard, i have control... Do this: turn off when it gets to 100F, the easiest issue to fix your...