To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. This isn't that uncommon on Coleman electric furnaces, most likely it's the sequencer, you can completely disconnect the thermostat and if it's still on it's a pretty good indicator that it's the sequencer. Push the switch to OFF and then to ON. Viewed 48k times 2. After that, turn the gas off as well. ... Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Could it have gone bad? Do you have an older furnace with a standing pilot light? Bad Control Relay or Board - Furnace Blower Fan Won’t Turn Off. This problem began with turning the furnace on for the first time this season. Be sure to turn off the electric before working inside the unit. In case the thermostat is turned off but does not turn off the furnace blower, then find the breaker in the fuse box or the central on and off switch on the furnace and turn it off. This category only includes cookies that ensures basic functionalities and security features of the website. silver dial on fan control switch sticks. The problem is that I have the thermostat set to 66°F and it does not turn off when it reaches that temperature. by High Performance HVAC | Gas Furnaces | 0 comments. Check the wiring to your furnace's thermostat. One sign that your furnace may need some attention is that your furnace fails to turn off and continues to run, even when the temperature reaches the set temp on the thermostat. In case the furnace turns off when the thermostat is … 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). Do this: Turn off your furnace at the thermostat, and check the furnace filter. So we’ll help you troubleshoot this problem quickly. A furnace blower motor that stops pushing warm air out is not the same as a blower that is forcing only cold air into your home. 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. Website operating Active 1 year, 11 months ago. Blower doesn't shut off on its own but if I tap silver dial it pops and stops blower. Your furnace filter may be located here, next to the blower. Turn it to AUTO and see if that helps. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. furnace blower won't turn on with air? Inspect your blower if your furnace won’t start. Why won’t my heat turn off?” We know it’s frustrating to have your furnace run non-stop. On 2017-10-28 by james. 2. This season my actual thermostat was working just fine but because it was so old some of the plastic broke off and we decided to replace it. ... Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Stop the Furnace. 1995-2018 MH Sub I, LLC dba Internet Brands. 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. If you see or hear the fan turn on, your blower motor is not the culprit. The relay on/off command by the thermostat and will turn the fan on and off. It could be a sign of low amperage. They turned on the propane bottles and ran the furnace, but it still blows and never shuts off. 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. This commission helps us pay for the overhead of running this website. I had a similar problem several months ago - house wasn't warming up much, found that furnace would go on but blower wouldn't and after a few minutes of running, furnace would turn off - presumably due to some high temperature limit being triggered by the heat not being dissipated by blowing air. Copyright© Please help!! Blower will not cut off. It is mandatory to procure user consent prior to running these cookies on your website. 2. Furnace burner turns off when fan turns on. If your furnace won’t turn on, go to your furnace (if it is accessible to you), and peak in the little plastic window on the side of it (most modern furnaces will have a window). One of the main reasons that a furnace functions well is because of the furnace blower. Even though we’ve had a warmer than average winter here in East Tennessee, we’re still having the occasional blast of winter air, causing people to crank those furnaces up one more time. Source. Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. suggestions. Furnace won’t turn on? Initially, the burner will turn off and then the blower would turn off as well. Initially, the burner will turn off and then the blower would turn off as well. 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. If they do not have the part, they can usually get the part on the same day. Other gas appliances such as stove, hot water tank, gas dryer work well. In case the furnace turns off when the thermostat is turned to off, a probable reason is a thermostat that is not working properly. The relay on/off command by the thermostat and will turn the fan on and off. You may freely link Set the thermostat to HEAT and the fan to AUTO. First, confirm that the room thermostat is not calling for heating or cooling. 1. However, when the switch is in bad condition and will not close, the furnace board would continue to run the blower endlessly. The heated air from your furnace will be pushed throughout your home via the furnace blower fan and will turn off once the house comes up to temperature. If the furnace won’t turn off and blows colder air towards the end of the heating process, you should check the temperature control. Push the switch to OFF and then to ON. Be sure to turn off the electric before working inside the unit. Ask Question Asked 5 years, 9 months ago. More modern gas furnaces will have a control board. This website uses cookies to improve your experience while you navigate through the website. They have turned off the main switch at the thermostat but the blower continues to blow. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. Hello I have a gas furnace Heil model nule100bg01. 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. Check the wiring manual that came with your furnace to see exactly how the wires should be hooked up based on your … When you raise the thermostat to a warmer temperature, the furnace blower will turn on after about 30 seconds. If your furnace won’t turn off, the easiest issue to fix is your thermostat. We use cookies to give you the best possible experience on our website. First, your temperature may … Over the years, it is not uncommon for ductwork to come loose or for seals to open up. When you hear the furnace making a humming noise, it could be a sign that your blower won’t last much longer. The problem is that I have the thermostat set to 66°F and it does not turn off when it reaches that temperature. Furnace Blower Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off. Common causes of this problem: Your thermostat fan setting is set to ON. I have a 20+ year old forced air gas with central air. It won't shut off … It is perfectly normal for the burner to continue to cycle on and off while the furnace is running. Leaking ductwork can be one of the most detrimental issues that your furnace can face while heating your home, but it’s … My Payne furnace blower won't shut off, and if I kill the power, when I turn it back on, the blower starts again? These cookies do not store any personal information. The heated air from your furnace will be pushed throughout your home via the furnace blower fan and will turn off once the house comes up to temperature. Turn the power back on the furnace. Do this: Try relighting the pilot light following these steps: Step 1: Turn off your furnace Not sure what year but I was tol... there is a ten year old thread on this; let me summarize. The furnace blower must run for 30 seconds after it comes on for the burner to fire up. 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. Generally, if the furnace blower motors works continually, the limit switch or the roll-out switch is open or in bad condition. In case the furnace blower does not turn off and it is not bringing cold air, the furnace is still lit. The technician comes out and discovers that the safety switch on the blower door was not engaged, which cut off power to the thermostat. Most HVAC technicians are trained in furnace repair and know about these safety issues and what happens if the controls are overridden. Problem: Fan on your furnace runs all the time and will not shut off. Required fields are marked *. All information is provided "AS IS." 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 Older thermostat wire can have degraded insulation. If your furnace fan is set to AUTO and is still running, then move on to the next section. I have a Carrier 58GS series Upflow Gas-Fired Furnace. My furnace seems to be heating okay it is just the blower will not shut off. In this case, the red and green wire would be touching somewhere in the bundle. Questions of a Do It Yourself nature should be Check to make sure the fan is not in the fan “ON” position on your thermostat. It is not safe and can lead to a catastrophe. Second, troubleshoot for fan limit switch problems. A switch based on the thermostat setting for setpoint and mode. Furnace - Thermostat. I have a nat gas, forced air, Bryant Plus 90 model 398AAWW060120D furnace, that is approx 25 to 30 years old. Turn the circuit breaker off and on to reset an electric furnace. Never, ever override a safety control on a furnace even temporarily. We'll assume you're ok with this, but you can opt-out if you wish. All rights reserved. There are many possible causes for an ill-functioning furnace. After that, turn power to the furnace back on and go back to the thermostat. All of these controls have contacts and a coil inside them. In this case, the fan motor needs replacing. Furnace Won’t Turn On: Here’s What to Do! I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit. If that does not stop the furnace blower, switch off the thermostat. But opting out of some of these cookies may have an effect on your browsing experience. Necessary cookies are absolutely essential for the website to function properly. There are two basic ways you can adjust your thermostat to ensure it isn’t what’s keeping your blower running. Next they actually disconnected the wire from the on/off switch, but the blower continues to blow. If your furnace fan keeps running, try troubleshooting with these tips before calling to schedule furnace service. Once the thermostat is satisfied it turns back the other way as the blower cools the furnace back down. Component changeouts did not make a difference in it's operation. However, in some instances, homeowners find that the furnace fan continuously runs and won’t turn off. This means the furnace blower is pushing out air, whether it’s heated or not, through the vents 24/7. Below, we will troubleshoot the various causes for a furnace that keeps turning on and off every few seconds. Furnace blower won’t turn off. These diagnostic steps are for an air handler, blower, or furnace fan that just won't quit running. 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. The fan limit switch is responsible for turning the blower on and off at the appropriate times. If a limit switch is found to be problematic as described here, we recommend replacing it. Either way, something is sticking when it should not be stocking, and the device needs to be replaced to correct the problem. I have a nat gas, forced air, Bryant Plus 90 model 398AAWW060120D furnace, that is approx 25 to 30 years old. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. at HEAT WON'T TURN OFF. Furnace blower motor won't turn off. Then, hot air may be forced or be blown away from plenum all the way through the house using the furnace blower. My furnace is running OK and heating the house. Still, problems or potential problems can be found and rectified before they do become a problem and fail. 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. Don’t try to survive all season without a furnace. Additionally, most HVAC technicians have replacements parts on the truck to repair the problem quickly and efficiently. These cookies will be stored in your browser only with your consent. Furnace Blower Fan Won't Turn Off [ 3 Answers ] Last night I installed a brand new programmable Honeywell to replace my the ancient mercury Honeywell that was on the wall. This problem will depend on what type of gas furnace you have. This problem is easily rectified by turning the switch to automatic on the thermostat. Things that lead to fun overheating can include: As you can see, these problems are furnace control issues. One of the primary causes of a humming furnace is dirty gas burners. A probe inside the switch monitors the temperature of the burner assembly to turn the fan on once the burners are hot and turns the fan off once the burners cool down (when the thermostat stops calling for heat). This gas valve and blower keep cycling on and off since the blower fan does not turn on and the temp is still low. Why blower won't turn off when hot tempetur is reach. More modern gas furnaces will have a control board. Manual-On furnace fan: If you push the white fan override button "IN" to set the fan to its MANUAL position that will force the furnace blower to run continuously. Before this happens, the overheating problem needs to be rectified or checked out. In addition to this, your furnace should also have a switch on it that will turn the furnace off. That is a common occurrence and can be a result of the following: Copyright© 2020 HighPerformanceHVAC.com |. It is the list of basic checks to make before calling for service. We welcome your comments and Your blower should run constantly until the heating cycle ends. The side effect has been that the furnace blower will not shut off. Locate the blower compartment with the inspection window. If your furnace wont shut off and you’re worried, don’t panic. You need to replace the switch right away if you think it’s not working. A thorough cleaning should be enough to eradicate the sound for good. Check to make sure the fan is not in the fan “ON” position on your thermostat. This website uses cookies to improve your experience. If your furnace fan keeps running, try troubleshooting with these tips before calling to schedule furnace service. Blower motor won't turn off [ 3 Answers ] I have a Carrier central air and furnace model 28GS 036 000. Go back to the furnace. Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. 14 Mar 2017 by admin. However, in some instances, homeowners find that the furnace fan continuously runs and won’t turn off. Belt Or Blower Problem. As a Minneapolis homeowner, a broken furnace during winter may seem like the end of the world. Turn off the furnace at the circuit breaker. If you do not properly turn it off, there may be problems ranging from a short in the wires to a bad gas valve. Your furnace is overheating How you’ll know this is your issue: Your furnace blows hot air but that air quickly turns cold then the furnace shuts off altogether. It won't shut off even when the … read more I can turn it off manually at the thermostat but the blower continues to run for a very long time before it shuts down. Also, always make sure you check and change the furnace filter at least every thirty days. If the fan still does not turn off, there’s a malfunction with thermostat or the furnace’s fan relay … When the coil is energized it either opens or closes the contact points depending on if it is normally open or normally closed. If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. Can’t find limit switch. I hear the blower come on, but the fan is not turning and another limit switch shuts the gas valve off. You can clearly hear the furnace blower motor hum, but it won’t … I have a very old dial thermostat. If you are lucky, you will find the problem there. This video shows how to fix that. Understanding how a furnace works will help you to determine what the cause of the problem might be. 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. I hope this helps and you have fixed the problem. It is perfectly normal for the burner to continue to cycle on and off while the furnace is running. Contact a heating and cooling company in St. Paul for furnace repair. There are two basic ways you can adjust your thermostat to ensure it isn’t what’s keeping your blower running. My Furnace Won’t Shut Off. View our Privacy Policy here. With the fan limit control, it is possible it could also be sticking and needs replacing. 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. After installing a Nest thermostat my furnace blower kept blowing. If the pilot light isn’t lit, then the furnace’s burners won’t light, meaning no heat. The problem is that the blower motor never stops running. Older furnaces will use either a sequencer relay or a simple peanut relay. Every forced hot air furnace has a furnace blower that makes air circulation possible for any house. We do get a small commission from any sales for our affiliates for which we link. The furnace board sees that one of these switches is open that is why it causes the blower on to make an attempt to get the heat out of the combustion chamber zone. Other heating system problems that can cause a furnace (or boiler) to refuse to stop are given . New blower wont stop nothing else working. You don’t need to know what a blower motor is to check that it is working properly. This is an extremely common issue that homeowners face. This may be the cause of your problem, and was likely switched off on accident, but be careful to ensure nobody turned the furnace off for a reason. If it’s On, try setting it to Auto — this will turn the fan off when the temperature reaches the desired setting. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. The gas switch must be located in front of the furnace. I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit.
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