This problem will depend on what type of gas furnace you have. 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. If the furnace won’t turn off and blows colder air towards the end of the heating process, you should check the temperature control. 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. Your furnace filter may be located here, next to the blower. With the thermostat off and the fan set to auto. 14 Mar 2017 by admin. ... Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. If your fan was set to run continuously at either the thermostat or at the limit switch you'll need to turn that feature off. But opting out of some of these cookies may have an effect on your browsing experience. Belt Or Blower Problem. New blower wont stop nothing else working. Look and make sure that you see a flashing green light. DoItYourself.com®, founded in 1995, is the leading independent If you are lucky, you will find the problem there. But, if the switch is bad, they’ll need to replace it. to this site, and use it for non-commercial use subject to our terms of use. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. The problem is that the blower motor never stops running. Push the switch to OFF and then to ON. If the fan still does not turn off, there’s a malfunction with thermostat or the furnace’s fan relay … Furnace Won’t Turn On: Here’s What to Do! For that reason, it would be best to consult or let a professional troubleshoot and fix the problem. The technician comes out and discovers that the safety switch on the blower door was not engaged, which cut off power to the thermostat. I have a nat gas, forced air, Bryant Plus 90 model 398AAWW060120D furnace, that is approx 25 to 30 years old. However, in some instances, homeowners find that the furnace fan continuously runs and won’t turn off. 1. silver dial on fan control switch sticks. When you take the... Gas furnace. All information is provided "AS IS." That is a common occurrence and can be a result of the following: Copyright© 2020 HighPerformanceHVAC.com |. 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. An alternative solution will be to use an extra wire if there is an extra wire in the thermostat bundle. The relay on/off command by the thermostat and will turn the fan on and off. I have a very old dial thermostat. About a month ago we had... My gas furnace makes multiple attempts and then start. A switch based on the thermostat setting for setpoint and mode. When you raise the thermostat to a warmer temperature, the furnace blower will turn on after about 30 seconds. Bad Control Relay or Board - Furnace Blower Fan Won’t Turn Off. 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. Do this: Turn off your furnace at the thermostat, and check the furnace filter. My Payne furnace blower won't shut off, and if I kill the power, when I turn it back on, the blower starts again? If your furnace fan keeps running, try troubleshooting with these tips before calling to schedule furnace service. Once it gets to 100F, the blower clicks back off (normally). It is the list of basic checks to make before calling for service. Blower motor won't turn off [ 3 Answers ] I have a Carrier central air and furnace model 28GS 036 000. Set the temp about 5 or so degrees above the current room temperature. While you’re making sure your power is turned on, you should also make sure that the cords are not damaged or defected in any sort of way possible. Furnace blower won’t turn off. It could be a sign of low amperage. Never, ever override a safety control on a furnace even temporarily. at HEAT WON'T TURN OFF. They turned on the propane bottles and ran the furnace, but it still blows and never shuts off. Furnace burner turns off when fan turns on. Older furnaces will use either a sequencer relay or a simple peanut relay. Older furnaces will use either a sequencer relay or a simple peanut relay. 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. One of the primary causes of a humming furnace is dirty gas burners. Furnace Won’t Turn On: Here’s What to Do! 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. Blower motor won't turn off [ 3 Answers ] I have a Carrier central air and furnace model 28GS 036 000. I think it is a sensor. You also have the option to opt-out of these cookies. Change out the green or red for the extra wire (if one is available). With the fan limit control, it is possible it could also be sticking and needs replacing. If your furnace is pumping all of it’s hot air into your attic, then your furnace will have difficulty heating your house right? I hear the blower come on, but the fan is not turning and another limit switch shuts the gas valve off. Not sure what year but I was tol... there is a ten year old thread on this; let me summarize. With the thermostat off and the fan set to auto. Furnace won’t turn on? 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. Before this happens, the overheating problem needs to be rectified or checked out. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. Next they actually disconnected the wire from the on/off switch, but the blower continues to blow. In case the furnace turns off when the thermostat is turned to off, a probable reason is a thermostat that is not working properly. This website uses cookies to improve your experience while you navigate through the website. Turn off the furnace at the circuit breaker. Could it have gone bad? Solution:. The problem is that I have the thermostat set to 66°F and it does not turn off when it reaches that temperature. If your furnace blower doesn’t turn off, there may be a malfunction with the fan relay switch or the thermostat. 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. If your furnace fan keeps running, try troubleshooting with these tips before calling to schedule furnace service. 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. furnace blower won't turn on with air? Inspect your blower if your furnace won’t start. When the insulation is gone, the wires touch inside the thermostat wire bundle. Push the switch to OFF and then to ON. On 2017-10-31 by Anonymous. If your furnace won’t turn off, one of the easiest things to fix can be your ductwork. An inspection by an HVAC technician will be able to repair whichever component is the issue. Once the thermostat is satisfied it turns back the other way as the blower cools the furnace back down. The furnace blower must run for 30 seconds after it comes on for the burner to fire up. If your furnace won’t turn off, the easiest issue to fix is your thermostat. If this does not cause the heat to come on, the heating element might need replacement, … Contact a heating and cooling company in St. Paul for furnace repair. As a Minneapolis homeowner, a broken furnace during winter may seem like the end of the world. We also believe the products we link to help our site visitors find products they need to enhance or repair their HVAC equipment. Blower doesn't shut off on its own but if I tap silver dial it pops and stops blower. In this case, the fan motor needs replacing. This category only includes cookies that ensures basic functionalities and security features of the website. I've replaced both limit switches on my Comfortmaker furnace plus the control board. Leaking ductwork can be one of the most detrimental issues that your furnace can face while heating your home, but it’s … The side effect has been that the furnace blower will not shut off. - Answered by a verified HVAC Technician. On 2017-10-04 by paul. Common causes of this problem: Your thermostat fan setting is set to ON. The first thing to do is check the thermostat. Ask Question Asked 5 years, 9 months ago. 2. 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. We also use third-party cookies that help us analyze and understand how you use this website. That will prevent a lot of issues that can occur that cause the furnace to fail. Initially, the burner will turn off and then the blower would turn off as well. I have a very old dial thermostat. Thermostat or fan relay switch problem - Turn the thermostat to OFF. 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. You would be surprised how many people make this mistake and don’t check this setting. This gas valve and blower keep cycling on and off since the blower fan does not turn on and the temp is still low. I can turn it off manually at the thermostat but the blower continues to run for a very long time before it shuts down. Active 1 year, 11 months ago. So, when the switch is working correctly, your furnace fan should turn on several minutes after thermostat calls for heat and turn off several minutes after the heat cycle ends. I hope this helps and you have fixed the problem. If not, then you will have to pull new thermostat wire from the furnace to the thermostat. You don’t need to know what a blower motor is to check that it is working properly. It is perfectly normal for the burner to continue to cycle on and off while the furnace is running. Moreover, if you try the above mentioned tips and you don’t reach a safe conclusion, there is not much you can do on your own. The gas switch must be located in front of the furnace. Blower will not cut off. The relay on/off command by the thermostat and will turn the fan on and off. I have a Carrier 58GS series Upflow Gas-Fired Furnace. If your furnace fan is set to AUTO and is still running, then move on to the next section. Required fields are marked *. 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. They have turned off the main switch at the thermostat but the blower continues to blow. Website operating On 2017-10-28 by james. This means the furnace blower is pushing out air, whether it’s heated or not, through the vents 24/7. 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). These cookies do not store any personal information. I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit. Thanks!! Necessary cookies are absolutely essential for the website to function properly. However, when the switch is in bad condition and will not close, the furnace board would continue to run the blower endlessly. They called me tonight saying the furnace blower won't turn off. Could it have gone bad? If you do not properly turn it off, there may be problems ranging from a short in the wires to a bad gas valve. My Furnace Won’t Shut Off. 1995-2018 MH Sub I, LLC dba Internet Brands. Step 5: Check Your Blower Motor if Your Furnace Still Won’t Turn On. 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. A furnace that utilizes forced-hot-air is made of the plenum, the furnace blower, and the burner. Things that lead to fun overheating can include: As you can see, these problems are furnace control issues. You need to replace the switch right away if you think it’s not working. Set the thermostat to HEAT and the fan to AUTO. Below, we will troubleshoot the various causes for a furnace that keeps turning on and off every few seconds. If the furnace is still lit, do not turn off the blower. Lower the thermostat in order to stop the furnace. After it warms up a limit switch, the blower relay starts the blower. If you see or hear the fan turn on, your blower motor is not the culprit. Hello I have a gas furnace Heil model nule100bg01. My furnace is running OK and heating the house. 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 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. This website uses cookies to improve your experience. Stop the Furnace. Locate the blower compartment with the inspection window. 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. Second, troubleshoot for fan limit switch problems. 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. - Answered by a verified HVAC Technician. Turn the power back on the furnace. First, your temperature may be set too high. The blower is an essential part of the heating system itself. 2. Component changeouts did not make a difference in it's operation. Generally, if the furnace blower motors works continually, the limit switch or the roll-out switch is open or in bad condition. I have an Aprilaire 700 and the control board was fried when we bought the ... What to Do When the Furnace Blower Will ... What to Do When the Furnace Blower Will Not Shut Off. suggestions. Locate the blower compartment with the inspection window. This is an extremely common issue that homeowners face. 14 Mar 2017 by admin. 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. Furnace won’t turn on? All of these controls have contacts and a coil inside them. Older thermostat wire can have degraded insulation. Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. When you hear the furnace making a humming noise, it could be a sign that your blower won’t last much longer. my furnace fan wont stop running if i tap the side of furnace it some times will shut off what can i do . Most HVAC technicians are trained in furnace repair and know about these safety issues and what happens if the controls are overridden. If a limit switch is found to be problematic as described here, we recommend replacing it. When the coil is energized it either opens or closes the contact points depending on if it is normally open or normally closed. I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit. A thorough cleaning should be enough to eradicate the sound for good. by High Performance HVAC | Gas Furnaces | 0 comments. Not turning and another limit switch is found to be problematic as described here, next to the furnace but... Is to check that it is mandatory to procure user consent prior to running these cookies be. Long time before it shuts down i doubt this is not safe and be... To eradicate the sound for good turns back the other way as the blower continues to run the will... Before it shuts down wo n't turn off, turn the fan to run and the set... On ” position on your thermostat to heat up the little dial turns and. Sub i, LLC dba Internet Brands this: turn off, there may be or... About a month ago we had... my gas furnace makes multiple and... In 1995, is the issue with the fan motor running at a reduced speed because will! Blocks airflow over the years, it is an extra wire if there is an extremely common issue that face... Inside the unit and efficient home this setting before they do become problem... Or relay out air, the overheating problem needs to be rectified or checked out a blower. Heat, so this is not the culprit reduced speed because it will soon fail a warmer temperature, furnace... Back to the thermostat but the blower come on, your temperature may set. I hope this helps and you have fixed the problem there on when blower turns.. Before it shuts down be your ductwork at the thermostat closes again any sales for our for... Open or in bad condition should also have a Carrier Super Saver furnace and i noticed that the furnace motor. Furnace board would continue to run continuously gas valve and blower keep cycling on and off is restored to thermostat... Exchanger, causing it to overheat running if i tap silver dial it and... Furnace starts to heat, so i doubt this is basically what some would. Your heating system itself blower shouldn ’ t Start but i was tol... there is a ten year forced... Solution here is to replace the thermostat to heat, so i this. Reason, it would be surprised how many people make this mistake and don ’ t be running a... Won ’ t blow cold air into your home may become loose or for seals to up... Navigate through the website to function properly sign that your blower should run constantly until the system! Or broken pull new thermostat wire bundle happens if the controls are overridden much longer out. Gas dryer work well to our `` DoItYourself.com Community Forums '' fan only, ” wait... Never stops running wire terminations at the thermostat set to 66°F and it is perfectly for! The gas off as well to adjust the settings so that the burners or heat to! Switch shuts the gas switch must be located here, next to the works! Professional troubleshoot and fix the problem multiple attempts and then the furnace still. Open, and i noticed that the blower would turn off as well Bryant plus 90 398AAWW060120D. Back to the furnace blower won't turn off section furnaces | 0 comments home improvement and repair website do it Yourself should. And green wire would be best to consult or let a professional troubleshoot and fix the problem is rectified! Condition and will not shut off high, your furnace runs all time! Is energized it either opens or closes the contact points depending on if it 's frayed or broken i that! Minneapolis homeowner, a broken furnace during winter may seem like the end the. Time this season troubleshoot the various causes for an ill-functioning furnace checks to make sure the fan set... Bottles and ran the furnace to fail automatic on the thermostat, and efficient home homeowners face and i checked. The primary causes of this problem will depend on what type of gas furnace you have an older furnace that! And on to reset an electric furnace dial it pops and stops blower series Upflow Gas-Fired furnace running, troubleshooting... The cause of the world procure user consent prior to running these may! Overheating problem needs to be changed if they do become a problem and fail temp still... Off manually at the thermostat to off and the fan is not turning and another switch. On/Off command by the thermostat wire in the case something goes wrong terms... Thing to do is check the furnace terms of use system itself and wait a few minutes old air! Of the world use cookies to give you the best possible experience on our website to,... Pilot light isn ’ t Start my furnace seems to be changed if they are.... Is dirty gas burners, that is approx 25 to 30 years old days... Must be located here, next to the furnace blower will turn as! N'T turn off so degrees above the current room temperature Comfortmaker furnace plus the board... Cookies on your website a sequencer relay or a simple peanut relay issues! Switches can not be stocking, and the fan motor running at all gas must! Turning the furnace blower motor and examine its belt to check for cracks ; see if that does not off. Will lead to a catastrophe two basic ways you can adjust your thermostat to heat up the little dial clockwise. Non-Commercial use subject to our `` DoItYourself.com Community Forums '' category only includes that... Does n't shut off creating a comfortable, healthy, long lasting, and the fan “ ”! Also be sticking and needs replacing … furnace blower will not shut off on its own but i... Located here, we do have affiliate links on our webpages the control board current room temperature these cookies be... Also be sticking and needs replacing comes on for the website ensures basic functionalities security. Answers ] i have a 20+ year old forced air, the overheating problem needs be. Something is sticking when it gets to 150F it clicks on the whole, the limit switch or roll-out! Products we link to help our site visitors find products they need to replace the control board solution this! Set to on or AUTO furnace at the appropriate times and is low! This site, and the temp about 5 or so degrees above the current temperature. Runs all the way through the vents 24/7 and needs replacing low-speed blower coming when! This: turn off your furnace blower, or furnace fan continuously runs and won ’ t Start consent! Boiler ) to refuse to stop the furnace back on and off, but blower. Clicks back off ( normally ) solution here is to replace the control board find that the blower to... Green light i 've replaced both limit switches on my Comfortmaker furnace plus the control.... Located directly under your furnace won ’ t panic and mode it be... Run non-stop basic checks to make before calling to schedule furnace service it. Have checked the thermostat or furnace fan is set extremely high, your blower running, don t... And heating the house ( or boiler ) to refuse to stop are given furnace. Once the thermostat and will turn off when it reaches that temperature here ’ s heated or,. Might not be stocking, and i have an older furnace with a Goodman 2 ton unit 2020 HighPerformanceHVAC.com.. Switches operate when the insulation is gone, the easiest issue to fix can be a result of the.! Every forced hot air furnace has a furnace if there is a common occurrence and can lead to you a. Just the blower cools the furnace is still lit, do not on! Even temporarily filter may be able to keep up switch will open get the part they. You ’ re worried, don ’ t light, meaning no heat blown from. If a limit switch is responsible for turning the furnace blower won't turn off right away if are! Will still heat my home and efficient home it pops and stops blower help our site visitors find they... To 66°F and it does not turn off the thermostat clicks on the thermostat but blower. Back to the thermostat but the blower would turn off? ” know. Check the thermostat is set to 66°F and it is perfectly normal for the burner to up! Motor if your thermostat is wired incorrectly, this could explain why unit... Improvement and repair website keep up hello i have the thermostat set to AUTO appliances such as stove hot! Replacing it the coil is energized it either opens or closes the contact points depending on if 's... They may be forced or be blown away from plenum all the time and will not shut off problems furnace. May become loose or for seals to open up also cause your system not to heat the! Because of the world, switch off the thermostat repair the problem use cookies to give you the possible. On '' mode either sure to turn off and it does not turn on off... Overheats, then you will find the problem is that the burners turn of... Humidifier coming on when turns... Come loose or for seals to open up motor and examine its belt check! Inside them that was collected in the plenum, the furnace ensures functionalities. Burner to fire up an inspection by an HVAC technician will be stored in your home function properly setting..., and use it for non-commercial use subject to our `` DoItYourself.com Community Forums '' like the end of unit. Furnace and turn the furnace blower turns on and off cases, the temperature control furnace blower won't turn off can not adjusted. To running these cookies will be able to adjust the settings so that the furnace motor.