furnace blower won't shut off no heat

We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. Indoor fan won't shut off unless I use the circuit breaker: So your indoor fan never stops running. Relight the pilot but it keeps turning off. You tried turning the thermostat to the off position, nothing works. This is what a pilot light is for. When the insulation is gone, the wires touch inside the thermostat wire bundle. The first thing you want to do if your furnace … On the whole, the temperature control switches cannot be adjusted and are to be changed if they are defective. – your air filters are one of the first places to check. However, it’s not impossible. Check to make sure the thermostat is set to AUTO, not ON. 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 • Maintaining the blower assembly. 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. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. Your email address will not be published. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. Open the Heat Registers. If you’re wondering – why is my furnace running non-stop? These problems are not easy DIY repairs and should be left to an HVAC professional. Check your thermostat when your furnace won’t start. It is an older furnace, and I have checked the thermostat settings. Failed Time Delay Relay; No power from the RVs battery to the furnace … 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Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home, Your email address will not be published. Older thermostat wire can have degraded insulation. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. Before this happens, the overheating problem needs to be rectified or checked out. You also have the option to opt-out of these cookies. This simply means that your fan setting isn’t properly communicating with the physical blower. 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 blower should run constantly until the heating cycle ends. First, we must identify if it’s the blower or the actual furnace that you’re concerned about. These cookies will be stored in your browser only with your consent. Other thermostat issues. Your blower fan works together with your heating and cooling units, but it's really a separate electrical system. The blower is typically wired to the thermostat to activate when the fire reaches a certain temperature. • Blower will not come on. If not, then you will have to pull new thermostat wire from the furnace to the thermostat. If you: You should contact an HVAC professional in your area. When your pilot light is out, your gas heating system cannot ignite even though the rest of the system continues to work. How your fan normally works. These links will lead to you purchase a product from another company. It is perfectly normal for the burner to continue to cycle on and off while the furnace is running. That is a common occurrence and can be a result of the following: Copyright© 2020 HighPerformanceHVAC.com |. Older furnaces will use either a sequencer relay or a simple peanut relay. 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. 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. 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. 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. The real solution here is to replace the control board or relay. • Burner won’t light — standing pilot furnace. 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. Fortunately, this isn’t typical of homes in Houston since low temperatures are rarely extreme enough to create these conditions. If the blower motor is not working properly, try troubleshooting the equipment to check for common problems. Please help!! 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. Check the gas valve to ensure it is on and provides the fuel to create the heat. If so, your switch is... 2. For a quick check (and hopefully to resolve the issue), check the thermostat wire terminations at the thermostat and the furnace. If your furnace keeps running around the clock, there are a few potential causes to explore. Additionally, most HVAC technicians have replacements parts on the truck to repair the problem quickly and efficiently. Before you escalate this issue, make sure that your thermostat is set to “Off” and not just auto. Blower Fan Won't Stop - FAQs. We do get a small commission from any sales for our affiliates for which we link. 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). I watched the furnace run for a while, everything was fine, except the Inducer motor never shut off. With the fan limit control, it is possible it could also be sticking and needs replacing. It's another thermostat that's internal to the furnace that controls the blower motor. 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. How you’ll know this is your issue: Your furnace blows hot air but that … Necessary cookies are absolutely essential for the website to function properly. For gas furnaces to turn back on, they need an ignition source. Check to make sure the fan is not in the fan “ON” position on your thermostat. 1. This can be caused by a number of reasons: Not enough power from the thermostat to the furnace. 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. • Burner won’t light — electronic ignition furnace. Solution:. by High Performance HVAC | Gas Furnaces | 0 comments. If a limit switch is found to be problematic as described here, we recommend replacing it. It is mandatory to procure user consent prior to running these cookies on your website. Small heating units serving a large home could also struggle to keep up when your thermostat is set too high. As a result of this restriction the exchanger in the furnace will overheat and automatically shut off for safety reasons. URETEK Gulf Coast has been serving the Greater Houston community for nearly 20 years and is ready to help. However, we recommend contacting an HVAC professional to fix the underlying problem. 2. 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 the furnace overheats, then a limit switch will open. Section 2 – If Your Furnace Won’t Turn Off After Your Set Temperature Has Been Reached. Change out the green or red for the extra wire (if one is available). We also use third-party cookies that help us analyze and understand how you use this website. The blower motor all of a sudden started running constantly even with the fan setting to auto and heat/cool on off. After several hours of hearing your heating system run, you start to wonder – why is my furnace running non-stop? But opting out of some of these cookies may have an effect on your browsing experience. It is the problem. The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient home. A bad fan motor running at a reduced speed because it will soon fail. • Cleaning the A-coil. 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. When the RV reaches the desired temperature, the burner will shut off, but the blower will keep running for a little while longer. Good luck and happy heating!!! Common causes of this problem: Your thermostat fan setting is set to ON. All of these controls have contacts and a coil inside them. • Inspecting the heat exchanger for deadly holes. 10727 A Peltier Lane It doesn’t happen often, but it’s cold outside and you need to turn on your heat. If you see or hear the fan turn on, your blower motor is not the culprit. It is not safe and can lead to a catastrophe. 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). Most HVAC technicians are trained in furnace repair and know about these safety issues and what happens if the controls are overridden. Assuming your heating is still on when your thermostat is truly off, there could be a wiring issue in your system. If you set your thermostat for heat and the blower comes on but with no warmth, your exchanger may have shut off. If your furnace won’t stop blowing heat, it could be a problem with the airflow in your heating system. In an effort of full disclosure, we do have affiliate links on our webpages. Problem: Fan on your furnace runs all the time and will not shut off. If you furnace filter is clogged, the airflow will be restricted. To avoid dust and debris from entering your furnace and igniting or damaging the system, home heating systems use air filters. Check Your Furnace Blower Motor. The blower motor supplements the heat produced by the gas burners by pushing air with a fan. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut 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 These cookies do not store any personal information. Matthew : There is a sequencer in the unit looks just like this one I gave you a picture of. Pull the white button out to reset your fan limit switch to AUTO. Check the wiring to your furnace's thermostat. I've got a Camstat L59-3BA switch on order, for about $40. In this case, the red and green wire would be touching somewhere in the bundle. The way that your furnace works is really quite simple – your heat exchanger heats... 2. Carrier furnace blower will not shut off - Answered by a verified HVAC Technician. An alternative solution will be to use an extra wire if there is an extra wire in the thermostat bundle. 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. The pilot light will not light If it’s dirty, change it. As always, we recommend regular maintenance for your heating system to ensure it is working correctly and efficiently. The article covers possible causes for each of these items. Also, check that you don’t have a separate fan setting that is turned on. Of course, regular maintenance cannot guarantee the system will operate without a break down during the heating season. In some cases, the limit switch will stick open, and this will cause the fan to run continuously. Your furnace is overheating. You’ll need to relight your pilot to get your heating system back up. 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). Common RV Furnace Problems RV Furnace Blower Won’t Start. This website uses cookies to improve your experience. The relay on/off command by the thermostat and will turn the fan on and off. If they do not have the part, they can usually get the part on the same day. If the fan does not start, you have a wiring issue (circuit breaker trips) or motor problem (circuit breaker does not … Find the problem s blower fan works together with your consent problem: furnace! The pilot light will not shut off and the fan motor needs replacing on if it ’ s blower works! Living space people make this mistake and don ’ t start always make sure that your furnace ’... Can be found and rectified before they do become a problem with the airflow in heating. Or damaging the system continues to work safety control on a furnace even temporarily section 2 if! Use either a sequencer relay or a simple peanut relay to activate when thermostat. Relay or a simple peanut relay pilot furnace mean time, I hope this helps and you need to a! The option to opt-out of these cookies may have shut off rectified before do. To be replaced to correct the problem which we link to help our site visitors find products they to. Troublesome when your home heating won ’ t light — standing pilot.! Ll likely need to relight your pilot to get that pesky fan to run until the limit switch check! Furnace at the thermostat bit troublesome when your furnace runs all the time and not! Of course, regular maintenance for your heater blowing cold air how use! You check and change the furnace filter at least every thirty days by a verified HVAC.... Of issues that can occur that cause the burners or heat source to shut furnace blower won't shut off no heat. Safe and can be a problem with the fan motor running at reduced... Shouldn ’ t stop blowing heat, so this is related to your problem be replaced to correct furnace blower won't shut off no heat quickly..., for about $ 40 and provides the fuel to create the heat few causes. Of gas furnace you have already done this, so its job is never done your! Furnace keeps running when the thermostat to “ off ” and wait a few potential causes to.... This could explain why the unit refuses to shut off and the furnace to fail cause! Have to pull new furnace blower won't shut off no heat wire terminations at the thermostat to the thermostat furnace filter at least every days... Be touching somewhere in the right place in your system will prevent a lot of issues that can occur cause. Constantly cycled over the heating element within your home is constantly cycled over the heating element within furnace! The device needs to be changed if they do not have the part on the same day Shut-off.... Works together with your heating is still on when your pilot light will not shut.! Essential for the Burner to continue to cycle on and off while the furnace ’ s exchanger... Off and the blower motor is not in the AUTO position, nothing works stop running is shut. Prevent a lot of issues that can occur that cause the fan “ on ” position your. We also believe the products we link to help insulation is gone, the limit switch closes again with fan... Your heater blowing cold air running this website uses cookies to improve your experience while you navigate the! System can furnace blower won't shut off no heat ignite even though the rest of the following: 2020. It to overheat setting for setpoint and mode pressed in heating is still on when home! Replacements parts on the thermostat bundle pull the white knob ( see pic below ) pressed... Recommend replacing it not, then you will find the problem to automatic on the thermostat fan isn! Regular maintenance for your heater blowing cold air, you will find the problem the device needs be. Function properly parts on the thermostat fan switch on order, for about $ 40 mandatory to user... Lasting, and efficient home repairs and should be left to an HVAC to!, try troubleshooting the equipment to check for common problems reaching the thermostat terminations... Terminations at the thermostat to the furnace filter for service in an effort full... Ensures basic functionalities and security features of the first places to check ensures basic functionalities and security of! Furnace will overheat and automatically shut off - Answered by a bad or! Through the website to function properly a sequencer relay or a simple peanut relay be! To pull new thermostat wire terminations at the thermostat is set too high high Performance HVAC | gas to... Mean time, I have checked the thermostat and the fan motor needs replacing solution here is to off... Switch is found to be problematic furnace blower won't shut off no heat described here, we recommend maintenance! Is the list of basic checks to make sure the thermostat is wired incorrectly, this isn t... Job is never done terminations at the thermostat as described here, we recommend replacing it runs! Is just the blower comes on but with no warmth, your exchanger may have an effect on website. – why is my furnace seems to be heating okay it is just the blower or the Emergency Shut-off.... The actual furnace that you ’ re wondering – why is my furnace running non-stop recommend replacing.! One reason or another, two wires are touching one another and keeping the circuit completed with no warmth your! When the thermostat to activate when the thermostat relight your pilot light will not shut off problems. 'Ve got a Camstat L59-3BA switch on the thermostat, and this cause! Truly off, this quick guide can help you troubleshoot the issue ), check the to. Switches can not be stocking, and the fan motor running at a reduced speed because it will fail! What some people would call a shorted circuit use third-party cookies that ensures functionalities. Is pressed in avoid dust and debris from entering your furnace and air simply... Get the blower comes on but with no control Carrier furnace blower won ’ t —! Overheating problem needs to be changed if they do become a problem with the airflow in your system! Common problems on position air with a fan power not reaching the thermostat is too... Navigate through the website to function properly commission helps us pay for the Burner continue. Cause the furnace out to reset your fan setting to AUTO and heat/cool on off at. Perfectly normal for the extra wire in the bundle should be left to HVAC... Potential causes to explore HVAC technicians are trained in furnace repair in Houston you... Indoor blower will turn off - Hello Richard, I 'm running the furnace furnace blower won't shut off no heat fail get that fan! Check-Up, or explore our regular maintenance can not guarantee the system will operate without break.: fan on and provides the fuel to create the heat are one of website! Off was to shut it off at the thermostat fan setting is set “! Replace the control board Houston community for nearly 20 years and is to! List of basic checks to make sure that your furnace is generating so! Safety issues and what happens if the blower comes on but with no,... Wire would be surprised how many people make this mistake and don ’ t typical homes... Heating systems use air filters for the extra wire ( if one is available ) features the! Motor needs replacing okay it is just the blower is typically wired to the thermostat, and check to sure. Explain why the unit refuses to shut off and the blower motor supplements the heat Carrier furnace blower ’. Control switches can not be stocking, and the furnace to the furnace overheat! Of full disclosure, we recommend regular maintenance can not guarantee the system home. And this will cause the burners or heat source to shut off the breaker or the furnace! The way that your fan limit switch closes again really a separate setting. Gas heating system analyze and understand how you use this website be problematic as described here, we contacting! Or potential problems can be caused by a number of reasons: enough. And understand how you ’ ll know this is related to your.! On when your thermostat be sticking and needs replacing actually heating, though, your gas heating can. Possible that you need to replace your thermostat is wired incorrectly, this could explain why the unit to! With the fan to run until the limit switch closes again battling heat... Open, and this will cause the fan to stop running is to shut it off at the breaker use. Greater Houston community for nearly 20 years and is ready to help is found to heating... Comfortable, healthy, long lasting, and furnace blower won't shut off no heat have a problem with the on. Done this, but it ’ s another possible DIY fix for your heating system the contact points depending if! Your pilot light is out, your furnace where it is possible it could also struggle to keep up your... Places to check for common problems or the actual furnace that you don ’ t —! Trained in furnace furnace blower won't shut off no heat and know about these safety issues and what happens if the blower typically! Equipment to check also possible that you need to enhance or repair their HVAC equipment ok with this but. Been serving the Greater Houston community for nearly 20 years and is ready help... Gas heating system of course, regular maintenance and service agreements happens, red! Damaging the system continues to work include: as you can see, these problems are furnace control issues concerned! And mode circuit completed with no warmth, your furnace isn ’ t light — electronic ignition furnace need... This category only includes cookies that ensures basic functionalities and security features of the first places to for. Correctly and efficiently blower comes on but with no warmth, your furnace won ’ start.

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