furnace blower won't shut off no heat

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 Your email address will not be published.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Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home, Your email address will not be published.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

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