furnace blower won't shut off no heat

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

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