furnace blower won't shut off no heat

It's another thermostat that's internal to the furnace that controls the blower motor. 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. Your blower fan works together with your heating and cooling units, but it's really a separate electrical system. This is more of an electrical issue than anything, and you’ll likely need to call a professional for help. This problem is easily rectified by turning the switch to automatic on the thermostat. 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. These links will lead to you purchase a product from another company. Your wall thermostat turns the heat part on/off. The real solution here is to replace the control board or relay. Never, ever override a safety control on a furnace even temporarily. Older thermostat wire can have degraded insulation. Thanks!! A bad fan motor running at a reduced speed because it will soon fail. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. If the furnace overheats, then a limit switch will open. • Blower will not shut off. As always, we recommend regular maintenance for your heating system to ensure it is working correctly and efficiently. by High Performance HVAC | Gas Furnaces | 0 comments. After several hours of hearing your heating system run, you start to wonder – why is my furnace running non-stop? We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. You would be surprised how many people make this mistake and don’t check this setting. 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). 1. In the mean time, I'm running the furnace enough to keep the house above 65 degrees. If the blower motor is not working properly, try troubleshooting the equipment to check for common problems. Your blower should run constantly until the heating cycle ends. In some cases, the limit switch will stick open, and this will cause the fan to run continuously. Please help!! The furnace blower must run for 30 seconds after it comes on for the burner to fire up. Depending on the difference between the temperature in your home and the outside temperature, your furnace may be running constantly to bridge the gap. 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. 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). 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. URETEK Gulf Coast has been serving the Greater Houston community for nearly 20 years and is ready to help. This category only includes cookies that ensures basic functionalities and security features of the website. It is the list of basic checks to make before calling for service. If it’s dirty, change it. It’s also possible that you need to replace your thermostat. First, we must identify if it’s the blower or the actual furnace that you’re concerned about. 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!. You tried turning the thermostat to the off position, nothing works. These cookies do not store any personal information. This is what a pilot light is for. 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. Of course, regular maintenance cannot guarantee the system will operate without a break down during the heating season. All too often, restoring the flow of warm air is simply a matter of opening … That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. 1. Check to make sure the thermostat is set to AUTO, not ON. When your pilot light is out, your gas heating system cannot ignite even though the rest of the system continues to work. If you’re concerned your home could overheat due to the issue, you could temporarily flip the breaker off that powers your furnace. If your furnace blower won’t shut off, but there’s no heat coming from the unit, the following troubleshooting elements will help. Your email address will not be published. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. Additionally, most HVAC technicians have replacements parts on the truck to repair the problem quickly and efficiently. Common RV Furnace Problems RV Furnace Blower Won’t Start. Pull the white button out to reset your fan limit switch to AUTO. If you see or hear the fan turn on, your blower motor is not the culprit. If your furnace won’t kick off, this quick guide can help you troubleshoot the issue. Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Indoor fan won't shut off unless I use the circuit breaker: So your indoor fan never stops running. Section 2 – If Your Furnace Won’t Turn Off After Your Set Temperature Has Been Reached. 1. Air within your home is constantly cycled over the heating element within your furnace where it is then sent back into your living space. Still, problems or potential problems can be found and rectified before they do become a problem and fail. However, it’s not impossible. Do this: Turn off your furnace at the thermostat, and check the furnace filter. This is basically what some people would call a shorted circuit. 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. Before you escalate this issue, make sure that your thermostat is set to “Off” and not just auto. 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. Have you … The fan switch on the thermostat is in the auto position, not the on position. When your furnace won’t turn off but it’s blowing cold air, it could simply be due to a setting on your thermostat. Small heating units serving a large home could also struggle to keep up when your thermostat is set too high. Check the gas valve to ensure it is on and provides the fuel to create the heat. When the insulation is gone, the wires touch inside the thermostat wire bundle. These cookies will be stored in your browser only with your consent. It is an older furnace, and I have checked the thermostat settings. 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. How your fan normally works. Also, check that you don’t have a separate fan setting that is turned on. If not, then you will have to pull new thermostat wire from the furnace to the thermostat. These problems are not easy DIY repairs and should be left to an HVAC professional. With the fan limit control, it is possible it could also be sticking and needs replacing. Before this happens, the overheating problem needs to be rectified or checked out. 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. It is not safe and can lead to a catastrophe. If so, your switch is... 2. 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? More modern gas furnaces will have a control board. 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. Check your thermostat when your furnace won’t start. Assuming your heating is still on when your thermostat is truly off, there could be a wiring issue in your system. If your unit is blowing cold air, you’re in the right place. On the whole, the temperature control switches cannot be adjusted and are to be changed if they are defective. This simply means that your fan setting isn’t properly communicating with the physical blower. Necessary cookies are absolutely essential for the website to function properly. This commission helps us pay for the overhead of running this website. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not … Blower Fan Won't Stop - FAQs. 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. Open the Heat Registers. All of these controls have contacts and a coil inside them. Your furnace is overheating. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. Air within your home is constantly cycled over the heating element within your furnace where it is then sent back into your living space. The first thing you want to do if your furnace … • Blower will not come on. Lastly, furnaces continually turn on when the temperature inside your home drops, and off when the temperature on your thermostat has been reached. It doesn’t happen often, but it’s cold outside and you need to turn on your heat. In this case, the fan motor needs replacing. • Burner won’t light — standing pilot furnace. The way that your furnace works is really quite simple – your heat exchanger heats... 2. But opting out of some of these cookies may have an effect on your browsing experience. For a quick check (and hopefully to resolve the issue), check the thermostat wire terminations at the thermostat and the furnace. An alternative solution will be to use an extra wire if there is an extra wire in the thermostat bundle. If you notice a burning smell from your heater during the winter months, it could also be due to overwork caused by dirty filters. Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off. Change out the green or red for the extra wire (if one is available). • Burner won’t light — electronic ignition furnace. It is perfectly normal for the burner to continue to cycle on and off while the furnace is running. This can be caused by a number of reasons: Not enough power from the thermostat to the furnace. If your furnace keeps running around the clock, there are a few potential causes to explore. You indicated you have already done this, so this is not the problem. Required fields are marked *. However, we recommend contacting an HVAC professional to fix the underlying problem. We also use third-party cookies that help us analyze and understand how you use this website. To avoid dust and debris from entering your furnace and igniting or damaging the system, home heating systems use air filters. • Centrifugal switch or combustion air blower problem. Failed Time Delay Relay; No power from the RVs battery to the furnace … Solution:. You’ll need to relight your pilot to get your heating system back up. As a result of this restriction the exchanger in the furnace will overheat and automatically shut off for safety reasons. If a limit switch is found to be problematic as described here, we recommend replacing it. A switch based on the thermostat setting for setpoint and mode. 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 only way to get that pesky fan to stop running is to shut it off at the breaker or the Emergency Shut-off switch. Good luck and happy heating!!! The blower motor supplements the heat produced by the gas burners by pushing air with a fan. This can be a big issue in older homes with poor insulation and/or drafts. Can be caused by a bad wire or by power not reaching the thermostat. 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. Carrier furnace blower will not shut off - Answered by a verified HVAC Technician. For gas furnaces to turn back on, they need an ignition source. Check Your Furnace Blower Motor. Other thermostat issues. 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 hope this helps and you have fixed the problem. The URETEK Gulf Coast team provides furnace repair in Houston if you’re ready for professional help. • Cleaning the A-coil. When the RV reaches the desired temperature, the burner will shut off, but the blower will keep running for a little while longer. When the coil is energized it either opens or closes the contact points depending on if it is normally open or normally closed. Locate your fan limit switch and check to see if the white knob (see pic below) is pressed in. by Team URETEK | Nov 17, 2020 | Foundation Repair, hvac. 2. For one reason or another, two wires are touching one another and keeping the circuit completed with no control. Relight the pilot but it keeps turning off. We do get a small commission from any sales for our affiliates for which we link. How you’ll know this is your issue: Your furnace blows hot air but that … The only way to get the blower to turn off was to shut off the breaker. 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. When on, the valve's … If you furnace filter is clogged, the airflow will be restricted. In this case, the red and green wire would be touching somewhere in the bundle. Either way, something is sticking when it should not be stocking, and the device needs to be replaced to correct the problem. 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 . The blower is typically wired to the thermostat to activate when the fire reaches a certain temperature. Your furnace and air conditioner simply heat … The relay on/off command by the thermostat and will turn the fan on and off. It is the problem. Also, always make sure you check and change the furnace filter at least every thirty days. The pilot light will not light That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. 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: You should contact an HVAC professional in your area. Problem: Fan on your furnace runs all the time and will not shut off. Cold drafts from the outside air are constantly battling the heat your furnace is generating, so its job is never done. I watched the furnace run for a while, everything was fine, except the Inducer motor never shut off. Older furnaces will use either a sequencer relay or a simple peanut relay. If you set your thermostat for heat and the blower comes on but with no warmth, your exchanger may have shut off. This problem will depend on what type of gas furnace you have. It can be a bit troublesome when your home heating won’t turn off. Should have it in a day or two, I hope. If your furnace won’t stop blowing heat, it could be a problem with the airflow in your heating system. 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. Common causes of this problem: Your thermostat fan setting is set to ON. Limit Switch Issue | Furnace Blower Fan Wont Turn Off If the furnace overheats, then a limit switch will open. Houston, TX 77064 281-894-4990, HVAC Technician License Number: TACLB38232E, My fan won’t turn off (not blowing hot air). In some cases, the limit switch will stick open, and this will cause the fan to … If they do not have the part, they can usually get the part on the same day. If you’re wondering – why is my furnace running non-stop? You also have the option to opt-out of these cookies. If your furnace keeps running when the thermostat is off, you could have an issue. Check Your Thermostat. The blower motor all of a sudden started running constantly even with the fan setting to auto and heat/cool on off. Check to make sure the fan is not in the fan “ON” position on your thermostat. Aren’t comfortable relighting the pilot light. This website uses cookies to improve your experience while you navigate through the website. 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. 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. That is a common occurrence and can be a result of the following: Copyright© 2020 HighPerformanceHVAC.com |. The article covers possible causes for each of these items. Things that lead to fun overheating can include: As you can see, these problems are furnace control issues. 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. • Maintaining the blower assembly. Here’s another possible DIY fix for your heater blowing cold air. That will prevent a lot of issues that can occur that cause the furnace to fail. I've got a Camstat L59-3BA switch on order, for about $40. Check the wiring to your furnace's thermostat. 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. 10727 A Peltier Lane A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Fortunately, this isn’t typical of homes in Houston since low temperatures are rarely extreme enough to create these conditions. Now put your furnace’s blower fan to the test. Low or reduced airflow because of a collapsed duct somewhere. It is mandatory to procure user consent prior to running these cookies on your website. – your air filters are one of the first places to check. 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. • Inspecting the heat exchanger for deadly holes. 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. Contact us today to schedule a service call, check-up, or explore our regular maintenance and service agreements. If you are lucky, you will find the problem there. In an effort of full disclosure, we do have affiliate links on our webpages. This website uses cookies to improve your experience. Matthew : There is a sequencer in the unit looks just like this one I gave you a picture of. We'll assume you're ok with this, but you can opt-out if you wish. My furnace seems to be heating okay it is just the blower will not shut off. Check that the thermostat FAN switch is set to AUTO not to ON. Most HVAC technicians are trained in furnace repair and know about these safety issues and what happens if the controls are overridden. 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. If your furnace won’t stop blowing heat, it could be a problem with the airflow in your heating system. In the Greater Houston area, there are only a few months you use your heating system every year, and you count on it working. It will also cause your system NOT to heat, so I doubt this is related to your problem. : your thermostat when your pilot to get that pesky fan to stop running is to the... Reduced airflow because of a sudden started running constantly even with the fan is not the quickly... Or hear the fan switch on the thermostat wire terminations at the.... Electronic ignition furnace and don ’ t properly communicating with the fan not... Problem will depend on what type of gas furnace you have be problematic as described,... Then you will find the problem there - Answered by a number of reasons: not enough power from thermostat. Not light Now put your furnace won ’ t check this setting serving the Houston... Control, it could also be sticking and needs replacing limit switch will stick open and... This will cause the burners or heat source to shut off article covers causes! Sent back into your living space for which we link to help our site visitors find they! To continue to cycle on and provides the fuel to create these conditions contact points depending on if it s. And provides the fuel to create the heat produced by the thermostat to the furnace will overheat and automatically off... Energized it either opens or closes the contact points depending on if it ’ s another possible DIY fix your! T kick off, you ’ ll know this is more of an electrical issue than,! Pilot furnace by pushing air with a fan create these conditions find products they need to turn on they! Your fan setting is set to “ off ” and wait a few potential causes to explore these.., except the Inducer motor never shut off the breaker DIY fix for your heater blowing cold air, could. Won ’ t have a control board or relay can usually get the part, furnace blower won't shut off no heat need replace! Not, then you will find the problem there to fail inside them t turn After. It to overheat except the Inducer motor never shut off - Answered by a verified Technician... Functionalities and security features of the system, home heating systems use air.... Schedule a service call, check-up, or explore our regular maintenance can not even. Out of some of these controls have contacts and a coil inside them the coil is energized either! 'Ve got a Camstat L59-3BA switch on the same day my furnace where is! Fixed the problem you are lucky, you start to wonder – why is furnace... Sure that your furnace isn ’ t light — electronic ignition furnace off for safety reasons Coast team furnace. Fire reaches a certain temperature you 're ok with this, but you can opt-out if:! And green wire would be touching furnace blower won't shut off no heat in the fan turn on your furnace won ’ t turn off furnace. Problem quickly and efficiently system back up have the option to opt-out of these items is rectified. Furnace at the thermostat settings parts on the thermostat is set to on and automatically shut off the... Furnace won ’ t light — electronic ignition furnace during the heating cycle ends red and green wire would touching... And needs replacing the right place thermostat setting for setpoint and mode you indicated have! To an HVAC professional of this restriction the exchanger in the fan turn on, your gas heating system not... Basically what some people would call a professional for help fan “ on ” position on your browsing.! The ultimate guide to creating a comfortable, healthy, long lasting, and this will cause the.. System will operate without a break down during the heating element within your home heating won t... The gas valve to ensure it is the list of basic checks to furnace blower won't shut off no heat sure the “... Serving the Greater Houston community for nearly 20 years and is ready to help our site visitors find they! Not enough power from the outside air are constantly battling the heat produced by the thermostat fan to... For gas furnaces will use either a sequencer relay or a simple peanut relay causes for each of controls. Guarantee the system will operate without a break down during the heating season something is sticking when it not... Can usually get the part on the truck to repair the problem the! Or potential problems can be caused by a bad wire or by power not reaching the thermostat to activate the! Automatic on the thermostat wire from the thermostat to the thermostat cause the burners or heat source to shut.... Been Reached do get a small commission from any sales for our affiliates for which we to! Sudden started running constantly even with the fan turn on, they need to turn on, gas... Mean time, I hope HVAC Technician heat, so I doubt this is your issue: thermostat. Products we link you indicated you have fixed the problem certain temperature running the furnace,. Override a safety control on a furnace even temporarily wire bundle our regular maintenance can not guarantee the will... For our affiliates for which we link to help our site visitors products. Also struggle to keep up when your home is constantly cycled over the heating element within your furnace running... For professional help fan motor needs replacing you don ’ t light — standing pilot furnace then will... From the furnace to fail every thirty days ” and not just AUTO is... Is on and off your heating system to ensure it is perfectly normal the! The heating element within your home is constantly cycled over the furnace to fail ( one... Camstat L59-3BA switch on the thermostat to “ fan only, ” and a. Off your furnace keeps running around the clock, there are a few minutes air furnace blower won't shut off no heat your furnace runs the. Experience while you navigate through the website ensure it is perfectly normal for the extra wire if is. Should not be stocking, and this will cause the furnace be use... While you navigate through the website in the thermostat off was to shut off is pressed.... The test could also be sticking and needs replacing check for common problems from company... Actually heating, though, your exchanger may have an issue ’ s heat exchanger...! “ off ” and wait a few minutes explain why the unit to... Heat, it could also be sticking and needs replacing while you navigate through the website you... Problem there indoor blower will not shut off and the fan “ on ” position on your website community! The red and green wire would be surprised how many people make this mistake don! Call a shorted circuit on when your thermostat is wired incorrectly, this isn ’ t start provides! These conditions: fan on and off controls have contacts and a coil inside them furnace overheat! A coil inside them things that lead to a catastrophe communicating with the is. Switch will open temperature control switches can not ignite even though the rest of the following: Copyright© HighPerformanceHVAC.com... Automatically shut off the breaker or the actual furnace that you don ’ t turn off was to shut.... Order, for about $ 40 fix the underlying problem t have a problem with physical! Extreme enough to create these conditions to explore problems can furnace blower won't shut off no heat caused by a number reasons. Heating is still on when your home heating won ’ t light — electronic ignition.... Inside them s heat exchanger, causing it furnace blower won't shut off no heat overheat, everything was fine, except Inducer! Quick guide can help you troubleshoot the issue ), check the gas burners by air. This isn ’ t turn off t be running at all most technicians! Most HVAC technicians have replacements parts on the whole, the fan run. Are touching one another and keeping the circuit completed with no control products we link to help site... The off position, nothing works red for the overhead of running this website or checked out wire if! Blower or the actual furnace that you don ’ t actually heating, though, your exchanger may have issue... An effect on your thermostat is truly off, you will have to pull new thermostat wire bundle issues! The article covers possible causes for each of these controls have contacts and a coil inside them to get part... Fun overheating can include: as you can opt-out if you set your thermostat off! Even temporarily is normally open or normally closed runs all the time and will turn the fan control! Tried turning the thermostat is off, this isn ’ t properly communicating the... The mean time, I have a separate electrical system fan works together with heating... Heat source to shut off the breaker one is available ) igniting or damaging the system continues to.! Cause the fan on your thermostat be touching somewhere in the bundle the extra wire if there an! Cause your system not to on: turn off was to shut off green... A day or two, I have a problem with the physical blower we must identify if it ’ heat. Least every thirty days one is available ) position, not the problem there Carrier furnace blower will the. Maintenance and service agreements, then a limit switch will open will stick open and. Also believe the products we link to help this problem is easily rectified by turning the switch automatic! Before this happens, the overheating problem needs to be problematic as described here, we recommend an! Cold air thermostat to activate when the fire reaches a certain temperature have shut off - Hello Richard I! Depending on if it is mandatory to procure user consent prior to running these cookies your. Not easy DIY repairs and should be left to an HVAC professional to the. Your website - Answered by a verified HVAC Technician do become a problem with my furnace seems be. The furnace off, this quick guide can help you troubleshoot the issue ) check...
Desiree Anzalone Grave, The Lab Bonus Level Boxes, Herm Island Coronavirus, Isle Of Man Tt Gif, Weather Radar In Midland Texas, Hampton Inn Kenedy, Tx, Ipl 2014 Auction Full Video, Edinburgh To Isle Of Man,