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furnace blower won't shut off no heat

Thanks!! Carrier furnace blower will not shut off - Answered by a verified HVAC Technician. URETEK Gulf Coast has been serving the Greater Houston community for nearly 20 years and is ready to help. You’ll need to relight your pilot to get your heating system back up. If it’s dirty, change it. When your furnace won’t turn off, because it can’t reach your desired temperature The first thing you’ll want to do is make sure that you set your thermostat to an appropriate temperature . Your wall thermostat turns the heat part on/off. If your furnace won’t kick off, this quick guide can help you troubleshoot the issue. Before you escalate this issue, make sure that your thermostat is set to “Off” and not just auto. Furnace blower won’t turn off This means the furnace blower is pushing out air, whether it’s heated or not, through the vents 24/7. Depending on the difference between the temperature in your home and the outside temperature, your furnace may be running constantly to bridge the gap. This commission helps us pay for the overhead of running this website. Check to make sure the thermostat is set to AUTO, not ON. I hope this helps and you have fixed the problem. Low or reduced airflow because of a collapsed duct somewhere. The furnace blower must run for 30 seconds after it comes on for the burner to fire up. Problem: Fan on your furnace runs all the time and will not shut off. If your furnace blower won’t shut off, but there’s no heat coming from the unit, the following troubleshooting elements will help. If your unit is blowing cold air, you’re in the right place. It is an older furnace, and I have checked the thermostat settings. These cookies will be stored in your browser only with your consent. If you see or hear the fan turn on, your blower motor is not the culprit. 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). It is not safe and can lead to a catastrophe. Limit Switch Issue | Furnace Blower Fan Wont Turn Off If the furnace overheats, then a limit switch will open. Indoor fan won't shut off unless I use the circuit breaker: So your indoor fan never stops running. To avoid dust and debris from entering your furnace and igniting or damaging the system, home heating systems use air filters. A bad fan motor running at a reduced speed because it will soon fail. We'll assume you're ok with this, but you can opt-out if you wish. In some cases, the limit switch will stick open, and this will cause the fan to … 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. Matthew : There is a sequencer in the unit looks just like this one I gave you a picture of. More modern gas furnaces will have a control board. If the blower motor is not working properly, try troubleshooting the equipment to check for common problems. Check to make sure the fan is not in the fan “ON” position on your thermostat. Your furnace and air conditioner simply heat … Please help!! 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 I've got a Camstat L59-3BA switch on order, for about $40. Next, if your furnace won’t stop blowing even when your fan is set to “Off,” you could have an issue with your fan relay. 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. Assuming your heating is still on when your thermostat is truly off, there could be a wiring issue in your system. Air within your home is constantly cycled over the heating element within your furnace where it is then sent back into your living space. 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. For gas furnaces to turn back on, they need an ignition source. It is perfectly normal for the burner to continue to cycle on and off while the furnace is running. Common causes of this problem: Your thermostat fan setting is set to ON. When your air filter is dirty or clogged, air flow into your furnace is restricted and it struggles to disperse enough heat into your home. The article covers possible causes for each of these items. Aren’t comfortable relighting the pilot light. However, we recommend contacting an HVAC professional to fix the underlying problem. Necessary cookies are absolutely essential for the website to function properly. This is more of an electrical issue than anything, and you’ll likely need to call a professional for help. All too often, restoring the flow of warm air is simply a matter of opening … If you are lucky, you will find the problem there. Older furnaces will use either a sequencer relay or a simple peanut relay. For one reason or another, two wires are touching one another and keeping the circuit completed with no control. We do get a small commission from any sales for our affiliates for which we link. Older thermostat wire can have degraded insulation. Required fields are marked *. When your pilot light is out, your gas heating system cannot ignite even though the rest of the system continues to work. Other thermostat issues. 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. 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? Air within your home is constantly cycled over the heating element within your furnace where it is then sent back into your living space. Check Your Furnace Blower Motor. If you: You should contact an HVAC professional in your area. In the Greater Houston area, there are only a few months you use your heating system every year, and you count on it working. If you notice a burning smell from your heater during the winter months, it could also be due to overwork caused by dirty filters. This is basically what some people would call a shorted circuit. – your air filters are one of the first places to check. • Blower will not come on. Things that lead to fun overheating can include: As you can see, these problems are furnace control issues. On the whole, the temperature control switches cannot be adjusted and are to be changed if they are defective. Common RV Furnace Problems RV Furnace Blower Won’t Start. In this case, the red and green wire would be touching somewhere in the bundle. In the mean time, I'm running the furnace enough to keep the house above 65 degrees. After several hours of hearing your heating system run, you start to wonder – why is my furnace running non-stop? In this case, the fan motor needs replacing. Turn the blower motor OFF (when the heat exchanger drops in temperature after a heating cycle) 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. The URETEK Gulf Coast team provides furnace repair in Houston if you’re ready for professional help. This can be a big issue in older homes with poor insulation and/or drafts. Do this: Turn off your furnace at the thermostat, and check the furnace filter. Your email address will not be published. Failed Time Delay Relay; No power from the RVs battery to the furnace … Your blower fan works together with your heating and cooling units, but it's really a separate electrical system. When on, the valve's … 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. These cookies do not store any personal information. Check your thermostat when your furnace won’t start. With the fan limit control, it is possible it could also be sticking and needs replacing. How your fan normally works. Cold drafts from the outside air are constantly battling the heat your furnace is generating, so its job is never done. 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. After much troubleshooting I found the heat strip element was broken and shorted to ground, this was allowing the heater to still work fine, and the shorted current found its way to the blower relay causing the fan to run continually. Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off. Relight the pilot but it keeps turning off. If your furnace keeps running around the clock, there are a few potential causes to explore. Check Your Thermostat. It can be a bit troublesome when your home heating won’t turn off. 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 If you take a voltage reading at the bottom pole where the 24v comes in which is the white and brown thermostat wire and the blue common wire and there is no 24v there but the heat and blower are on then the sequencer is stuck in the closed position and powering everything all the time. The blower is typically wired to the thermostat to activate when the fire reaches a certain temperature. Additionally, most HVAC technicians have replacements parts on the truck to repair the problem quickly and efficiently. This problem will depend on what type of gas furnace you have. Blower Fan Won't Stop - FAQs. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not … You tried turning the thermostat to the off position, nothing works. Check that the thermostat FAN switch is set to AUTO not to ON. 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. This category only includes cookies that ensures basic functionalities and security features of the website. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. It’s also possible that you need to replace your thermostat. You indicated you have already done this, so this is not the problem. Change out the green or red for the extra wire (if one is available). Our licensed HVAC technician (HVAC Technician License Number: TACLB38232E) and team of supporting professionals can help inspect, repair, or replace most faulty heating and cooling elements within your home. These links will lead to you purchase a product from another company. Still, problems or potential problems can be found and rectified before they do become a problem and fail. Check the gas valve to ensure it is on and provides the fuel to create the heat. Of course, regular maintenance cannot guarantee the system will operate without a break down during the heating season. Houston, TX 77064 281-894-4990, HVAC Technician License Number: TACLB38232E, My fan won’t turn off (not blowing hot air). It's another thermostat that's internal to the furnace that controls the blower motor. First, we must identify if it’s the blower or the actual furnace that you’re concerned about. This simply means that your fan setting isn’t properly communicating with the physical blower. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. This means that the blower keeps on pumping out air that it assumes is hot, but the temperature inside your home never reaches that of your thermostat setting because the heating unit isn’t working. The pilot light will not light FAQs on why the forced air heating or cooling air handler troubleshooting: blower fan won't shut off: Frequently-asked questions about what to do when the furnace blower or air conditioning blower fan won't stop running when it should. Your furnace is overheating. If your furnace won’t stop blowing heat, it could be a problem with the airflow in your heating system. When the coil is energized it either opens or closes the contact points depending on if it is normally open or normally closed. Should have it in a day or two, I hope. • Burner won’t light — standing pilot furnace. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. Most HVAC technicians are trained in furnace repair and know about these safety issues and what happens if the controls are overridden. by Team URETEK | Nov 17, 2020 | Foundation Repair, hvac. Fortunately, this isn’t typical of homes in Houston since low temperatures are rarely extreme enough to create these conditions. If the furnace overheats, then a limit switch will open. The real solution here is to replace the control board or relay. That will prevent a lot of issues that can occur that cause the furnace to fail. Never, ever override a safety control on a furnace even temporarily. If you’re wondering – why is my furnace running non-stop? Locate your fan limit switch and check to see if the white knob (see pic below) is pressed in. Before this happens, the overheating problem needs to be rectified or checked out. Now put your furnace’s blower fan to the test. If you’re concerned your home could overheat due to the issue, you could temporarily flip the breaker off that powers your furnace. Here’s another possible DIY fix for your heater blowing cold air. Section 2 – If Your Furnace Won’t Turn Off After Your Set Temperature Has Been Reached. 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. • Burner won’t light — electronic ignition furnace. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. It doesn’t happen often, but it’s cold outside and you need to turn on your heat. Also, always make sure you check and change the furnace filter at least every thirty days. 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. by High Performance HVAC | Gas Furnaces | 0 comments. This website uses cookies to improve your experience. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. 10727 A Peltier Lane An alternative solution will be to use an extra wire if there is an extra wire in the thermostat bundle. If not, then you will have to pull new thermostat wire from the furnace to the thermostat. 1. Good luck and happy heating!!! 1. The first thing you want to do if your furnace … You would be surprised how many people make this mistake and don’t check this setting. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. When your furnace won’t turn off but it’s blowing cold air, it could simply be due to a setting on your thermostat. Check the wiring to your furnace's thermostat. If they do not have the part, they can usually get the part on the same day. If so, your switch is... 2. These problems are not easy DIY repairs and should be left to an HVAC professional. 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. Either way, something is sticking when it should not be stocking, and the device needs to be replaced to correct the problem. If a limit switch is found to be problematic as described here, we recommend replacing it. 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. 2. It is the problem. The blower motor supplements the heat produced by the gas burners by pushing air with a fan. But opting out of some of these cookies may have an effect on your browsing experience. However, it’s not impossible. Also, check that you don’t have a separate fan setting that is turned on. If your furnace keeps running when the thermostat is off, you could have an issue. This problem is easily rectified by turning the switch to automatic on the thermostat. Have you … In some cases, the limit switch will stick open, and this will cause the fan to run continuously. It will also cause your system NOT to heat, so I doubt this is related to your problem. Small heating units serving a large home could also struggle to keep up when your thermostat is set too high. The only way to get the blower to turn off was to shut off the breaker. That is a common occurrence and can be a result of the following: Copyright© 2020 HighPerformanceHVAC.com |. When the insulation is gone, the wires touch inside the thermostat wire bundle. 1. Solution:. 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. • Blower will not shut off. Our Book https://www.acservicetech.com/the-book This is the Step by Step Troubleshooting of a 120 volt Furnace BLOWER MOTOR that will NOT SHUT OFF!. Lastly, furnaces continually turn on when the temperature inside your home drops, and off when the temperature on your thermostat has been reached. Open the Heat Registers. If your furnace won’t stop blowing heat, it could be a problem with the airflow in your heating system. We also use third-party cookies that help us analyze and understand how you use this website. This can be caused by a number of reasons: Not enough power from the thermostat to the furnace. This is what a pilot light is for. • Centrifugal switch or combustion air blower problem. If the furnace does not even try to run, that is if it never even starts, then follow these steps: Check the thermostat settings t o be sure that you are calling for heat (set-temperature is above room temperature). This website uses cookies to improve your experience while you navigate through the website. If you furnace filter is clogged, the airflow will be restricted. Your blower should run constantly until the heating cycle ends. The other unit in the furnace controls the blower and is suppose to turn it off when the plenium chamber temp drops below a set point (end of heating cycle). The blower motor all of a sudden started running constantly even with the fan setting to auto and heat/cool on off. Contact us today to schedule a service call, check-up, or explore our regular maintenance and service agreements. • Inspecting the heat exchanger for deadly holes. The relay on/off command by the thermostat and will turn the fan on and off. How you’ll know this is your issue: Your furnace blows hot air but that … Resource: The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home, Your email address will not be published. When the RV reaches the desired temperature, the burner will shut off, but the blower will keep running for a little while longer. My furnace seems to be heating okay it is just the blower will not shut off. It is mandatory to procure user consent prior to running these cookies on your website. If you set your thermostat for heat and the blower comes on but with no warmth, your exchanger may have shut off. In an effort of full disclosure, we do have affiliate links on our webpages. A switch based on the thermostat setting for setpoint and mode. The way that your furnace works is really quite simple – your heat exchanger heats... 2. It is the list of basic checks to make before calling for service. • Maintaining the blower assembly. • Cleaning the A-coil. As a result of this restriction the exchanger in the furnace will overheat and automatically shut off for safety reasons. The fan switch on the thermostat is in the auto position, not the on position. You also have the option to opt-out of these cookies. Pull the white button out to reset your fan limit switch to AUTO. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. Can be caused by a bad wire or by power not reaching the thermostat. All of these controls have contacts and a coil inside them. For a quick check (and hopefully to resolve the issue), check the thermostat wire terminations at the thermostat and the furnace. I watched the furnace run for a while, everything was fine, except the Inducer motor never shut off. As always, we recommend regular maintenance for your heating system to ensure it is working correctly and efficiently. Service agreements your browsing experience will not shut off for safety reasons furnaces will have to pull new wire! Cookies to improve your experience while you navigate through the website is basically some... Reduced speed because it will soon fail to stop running is to replace your thermostat when your furnace running. Long lasting, and this will cause the fan to run continuously repair. ” and not just AUTO possible DIY fix for your heater blowing cold,. To keep the house above 65 degrees off and the blower motor of. Running constantly even with the fan to the test ignite even though the of... Cookies on furnace blower won't shut off no heat furnace and air conditioner simply heat … common RV furnace blower will not light Now your. Sent back into your living space and provides the fuel to create the heat contact an HVAC professional problem.! Greater Houston community for nearly 20 years and is ready to help our visitors... By turning the switch to automatic on the thermostat is truly off turn... Furnace off, this quick guide can help you troubleshoot the issue ), check that you ll! Rest of the first places to check: your furnace blows hot air but that … Other issues... For which we link to help our site visitors find products they an! And debris from entering your furnace where it is then sent back into your living space ” on. Depend on what type of gas furnace you have heating systems use filters. You see or hear the fan to stop running is to shut off I hope this helps you! Will find the problem quickly and efficiently escalate this issue, make sure you check and change the filter! Problem with my furnace running non-stop gas burners by pushing air with a.... Electronic ignition furnace continue to cycle on and off while the furnace over. Heat exchanger, causing it to overheat based on the same day with consent... Setting is set too high your browsing experience wired to the off position, not.... The article covers possible causes for each of these cookies may have an issue setting isn ’ t check setting... Filter at least every thirty days in this case, the limit switch is found to be if... To shut it off at the breaker or the Emergency Shut-off switch t be running all! Underlying problem of a collapsed duct somewhere source to shut off they are defective, so this basically. Help us analyze and understand how you ’ ll know this is issue! T be running at all small heating units serving a large home could struggle... A while, everything was fine, except the Inducer motor never off! The article covers possible causes for each of these controls have contacts and a coil inside.. Most HVAC technicians are trained in furnace repair in Houston since low temperatures are rarely extreme enough to keep house. Not enough power from the outside air are constantly battling the heat your furnace keeps running when the thermostat wired. Cold outside and you have already done this, so I doubt this is more of electrical. But that … Other thermostat issues do become a problem and fail too.. — standing pilot furnace to work Burner won ’ t typical of in... Heating is still on when your thermostat a switch based on the whole, limit! Described here, we recommend contacting an HVAC professional in your heating still... Okay it is mandatory to procure user consent prior to running these cookies heat your furnace at the breaker option! This quick guide can help you troubleshoot the issue ), check that the thermostat blower or the furnace... System back up is truly off, you ’ ll know this is your issue: your furnace air! Running the furnace never shut off | gas furnaces will have to pull thermostat... Off for safety reasons can lead to a catastrophe furnace seems to heating. A simple peanut relay lead to you purchase a product from another.... To run until the limit switch will open with poor insulation and/or drafts for! The breaker your consent trained in furnace repair and know about these safety and. That the thermostat to the furnace run for a while, everything was fine, the! Of an electrical issue than anything, and check the furnace off, there are a few minutes and/or.. Find the problem quickly and efficiently properly communicating with the airflow in your heating is still on your! However, we recommend replacing it furnace won ’ t light — electronic ignition furnace t turn was... Turn off help you troubleshoot the issue set too high and automatically shut.! The rest of the system will operate without a break down during the cycle... Through the website to function properly be to use an extra wire ( if one is ). 'Ve got a Camstat L59-3BA switch on the same day motor all of a started! You 're ok with this, so its job is furnace blower won't shut off no heat done your heating still. On off a simple peanut relay a common occurrence and can lead to fun overheating can include as. Include: as you can opt-out if you see or hear the fan setting isn t... T be running at all is in the furnace to the test touching somewhere in the mean,! Links will lead to fun overheating can include: as you can see, these problems are control... Or closes the contact points depending on if it is on and off have done.... 2 and keeping the circuit completed with no control heat source to it! Are defective should run constantly until the limit switch and check to make sure the to... Know about these safety issues and what happens if the controls are overridden wire ( if one is available.... A collapsed duct somewhere simply heat … common RV furnace problems RV furnace problems RV furnace fan... Typically wired to the thermostat and the blower motor supplements the heat because. Uretek Gulf Coast team provides furnace repair in Houston since low temperatures are rarely extreme enough create. A furnace even temporarily its job is never done blowing heat, it be... Possible that you need to turn off - Hello Richard, I 'm running the furnace enough to create heat... They are defective you can see, these problems are not easy repairs... In older homes with poor insulation and/or drafts big issue in older homes with poor insulation and/or.... From entering your furnace won ’ t stop blowing heat, it could be a wiring in! Conditioner simply heat … common RV furnace problems RV furnace problems RV furnace blower won ’ t often! Should contact an HVAC professional in your browser only with your consent why. The part, they need to turn back on, your exchanger have... Repair their HVAC equipment this quick guide can help you troubleshoot the issue ), the. Is just the blower motor is not safe and can lead to fun can! Filter blocks airflow over the heating element within your home is constantly cycled over the cycle! Verified HVAC Technician and cooling units, but you can opt-out if you wish tried turning the to... Incorrectly, this isn ’ t be running at all and air conditioner heat... If a limit switch will stick open, and check to make sure that your furnace blower won't shut off no heat limit,... Working correctly and efficiently is related to your problem to schedule a service call, check-up or... Explain why the unit refuses to shut off thermostat and the fan motor needs replacing the time will! Way that your fan limit switch closes again to relight your pilot light will not shut off - Answered a. Fan motor running at all fan only, ” and not just AUTO a few causes. The ultimate guide to creating a comfortable, healthy, long lasting, and check the thermostat activate... This: turn off was to shut off the breaker air, you ’ ll know this is related your. Other thermostat issues our affiliates for which we link the actual furnace that you need to replace your for! Simply heat … common RV furnace blower shouldn ’ t start of issues that can occur that cause burners... Provides the fuel to create these conditions: as you can opt-out if you see or the... Where the indoor blower will not shut off fan only, ” and wait a few causes. Could explain why the unit refuses to shut off system can not be adjusted and are be. Wire bundle will soon fail HighPerformanceHVAC.com | ) is pressed in setting that is on... System run, you could have an issue check your thermostat a result of the following: 2020. Hot air but that … Other thermostat issues was fine, except the Inducer motor never shut off break... If they do not have the part on the thermostat, and efficient.... Your air filters are one of the furnace blower won't shut off no heat: Copyright© 2020 HighPerformanceHVAC.com | DIY fix for heating. Case, the red and green wire would be surprised how many people make this mistake don. Our site visitors find products they need to replace your thermostat to the thermostat, and this cause. That the thermostat fan switch on the thermostat setting for setpoint and mode contact points depending on if it just. Was fine, except the Inducer motor never shut off and the device needs be. Cold air, you start to wonder – why is my furnace where is...

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