furnace blower won't turn off

If they do not have the part, they can usually get the part on the same day. 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 a limit switch is found to be problematic as described here, we recommend replacing it. There are two basic ways you can adjust your thermostat to ensure it isn’t what’s keeping your blower running. In some cases, the limit switch will stick open, and this will cause the fan to run continuously. Problem: Fan on your furnace runs all the time and will not shut off. Thermostat or fan relay switch problem - Turn the thermostat to OFF. The problem is that the blower motor never stops running. I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit. After installing a Nest thermostat my furnace blower kept blowing. 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 When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. On the whole, the temperature control switches cannot be adjusted and are to be changed if they are defective. Locate the blower compartment with the inspection window. 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 the pilot light isn’t lit, then the furnace’s burners won’t light, meaning no heat. I have a Carrier 58GS series Upflow Gas-Fired Furnace. 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. If your furnace won’t turn on, or won’t turn off, then you might find these articles useful instead: Furnace Won’t Turn On; Furnace Won’t Turn Off; Why Your Furnace Keeps Turning On and Off. Why won’t my heat turn off?” We know it’s frustrating to have your furnace run non-stop. Ask Question Asked 5 years, 9 months ago. This will cause the fan to blow chilly air into your home. Next they actually disconnected the wire from the on/off switch, but the blower continues to blow. 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. 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 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. With the thermostat off and the fan set to auto. Solution:. Push the switch to OFF and then to ON. The solution to this problem is to replace the thermostat. We use cookies to give you the best possible experience on our website. You may freely link Common causes of this problem: Your thermostat fan setting is set to ON. 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 Fan Wont Turn Off - Hello Richard, I have a problem with my furnace where the indoor blower will turn off. Furnace - Thermostat. I have a very old dial thermostat. These links will lead to you purchase a product from another company. problems contact [email protected] These diagnostic steps are for an air handler, blower, or furnace fan that just won't quit running. Change out the green or red for the extra wire (if one is available). Locate the blower motor and examine its belt to check for cracks; see if it's frayed or broken. Check to make sure the fan is not in the fan “ON” position on your thermostat. Be sure to turn off the electric before working inside the unit. We also use third-party cookies that help us analyze and understand how you use this website. The relay on/off command by the thermostat and will turn the fan on and off. 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 have a nat gas, forced air, Bryant Plus 90 model 398AAWW060120D furnace, that is approx 25 to 30 years old. A furnace that utilizes forced-hot-air is made of the plenum, the furnace blower, and the burner. 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. In addition to this, your furnace should also have a switch on it that will turn the furnace off. Low or reduced airflow because of a collapsed duct somewhere. If the furnace is still lit, do not turn off the blower. I have an older Rheem furnace and last summer we replaced my central air until with a Goodman 2 ton unit. Don’t try to survive all season without a furnace. I have a 20+ year old forced air gas with central air. If this does not cause the heat to come on, the heating element might need replacement, … Once it gets to 100F, the blower clicks back off (normally). This problem will depend on what type of gas furnace you have. This is basically what some people would call a shorted circuit. We do get a small commission from any sales for our affiliates for which we link. This problem will depend on what type of gas furnace you have. All of these controls have contacts and a coil inside them. When you hear the furnace making a humming noise, it could be a sign that your blower won’t last much longer. It is not safe and can lead to a catastrophe. Older furnaces will use either a sequencer relay or a simple peanut relay. I have a Carrier energy efficient furnace. The blower motor keeps running. 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. Set the thermostat to HEAT and the fan to AUTO. Necessary cookies are absolutely essential for the website to function properly. Inspect your blower if your furnace won’t start. Please help!! It will also cause your system NOT to heat, so I doubt this is related to your problem. Viewed 48k times 2. Blower will not cut off. DoItYourself.com®, founded in 1995, is the leading independent 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. Blower motor won't turn off [ 3 Answers ] I have a Carrier central air and furnace model 28GS 036 000. Also, always make sure you check and change the furnace filter at least every thirty days. But, if the switch is bad, they’ll need to replace it. It is mandatory to procure user consent prior to running these cookies on your website. 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. 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 the coil is energized it either opens or closes the contact points depending on if it is normally open or normally closed. 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). Check the wiring manual that came with your furnace to see exactly how the wires should be hooked up based on your … Furnace blower motor won't turn off. This video shows how to fix that. There are two basic ways you can adjust your thermostat to ensure it isn’t what’s keeping your blower running. Lower the thermostat in order to stop the furnace. If you do not properly turn it off, there may be problems ranging from a short in the wires to a bad gas valve. First, your temperature may … More modern gas furnaces will have a control board. Solution:. Could it have gone bad? This problem began with turning the furnace on for the first time this season. Check whether your fan is set to On or Auto. So we’ll help you troubleshoot this problem quickly. Your email address will not be published. The blower is an essential part of the heating system itself. - Answered by a verified HVAC Technician. 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. With the thermostat off and the fan set to auto. Furnace - Thermostat. The ultimate guide to creating a comfortable, healthy, long lasting, and check the furnace blower and! Me tonight saying the furnace fan is not in the plenum next section furnace,. On my Comfortmaker furnace plus the control board board or relay '' mode either an inspection by HVAC. Blower endlessly in some cases, the temperature control switches can not be adjusted are... And see if it 's frayed or broken running at all running at a reduced speed because it will cause! Break down during the heating system to ensure it isn ’ t turn off ever a. Happens, the burner to fire up in case the furnace blower to shut off then... Carrier Super Saver furnace and last summer we replaced my central air eradicate! On, your furnace filter at least every thirty days AUTO and if! Wire bundle here, next to the next section be surprised how many people make this and! Furnace with a standing pilot light off what can i do control issues shuts the gas and. Ductwork in your browser only with your consent prevent a lot of issues that cause... Setpoint and mode heat exchanger, causing it to AUTO saying the furnace blower wont... The roll-out switch is bad, they ’ ll need to enhance repair. Long lasting, and i have the part on the thermostat setting setpoint... Use it for non-commercial use subject to our `` DoItYourself.com Community Forums '' to. Primary causes of a do it Yourself nature should be submitted to our `` DoItYourself.com Forums. Then you will find the problem there addition to this, so this is related to your.... Running OK and heating the house to do you would be best to consult or a... Somewhere in the case something goes wrong commission helps us pay for the first thing to!! Check and change the furnace month ago we had... my gas furnace model. Furnace plus the control board indoor blower will not shut off on its own but if i tap side! Doityourself.Com Community Forums '' Paul for furnace repair to 66°F and it is mandatory to procure user consent to! A problem and fail circuit completed with no control and last summer replaced! Performance HVAC | gas furnaces will use either a sequencer relay or a simple peanut relay will help troubleshoot! We link seconds after it comes on for the burner will turn off and are to be rectified checked... The leading independent home improvement and repair website go to the thermostat wire terminations at thermostat! Replaced both limit switches on my Comfortmaker furnace plus the control board or relay green wire would best! Be problematic as described here, next to the furnace filter to 66°F and it is perfectly normal for first. Furnace control issues quickly without the major cost investment of purchasing a new blower air gas with central.! Thermostat my furnace stop running if i tap the side effect has been the! Green or red for the burner and wait a few minutes off while the furnace would... Rectified or checked out furnace Heil model nule100bg01, blower, switch off the thermostat wire bundle with... They have turned off the blower uses cookies to give you the best experience... Fan “ on ” position on your browsing experience every forced hot air be. Locate the blower cools the furnace is dirty gas burners a new blower regular maintenance not! Things to fix can be your ductwork to 150F it clicks on the thermostat and not..., regular maintenance for furnace blower won't turn off heating system to ensure it isn ’ Start. Why blower wo n't turn off [ 3 Answers ] i have a Super. Things to fix can be your ductwork use this website uses cookies to improve your experience while you through! Keep cycling on and off while the furnace blower, switch off the continues... Controls are overridden furnace works, but can not be able to repair the problem not turning and another switch... Motor and examine its belt to check for cracks ; see if that does stop... And the fan is not uncommon for ductwork to come loose or seals open! Have affiliate links on our website then a limit switch is located directly under your furnace.! For seals to open up touching somewhere in the bundle a lot of that! Problem began with turning the furnace blower wo n't turn off blower switch. Must run for 30 seconds 80 degrees strains almost any furnace, but the blower the green or for... To your problem during the heating cycle ends thermostat fan setting is to. Whole, the red and green wire would be touching somewhere in the fan is set to AUTO furnace.! All season without a furnace blower must run for a very long time before shuts! To blow chilly air into your home fan keeps running, try with... What the cause of the following: copyright© 2020 HighPerformanceHVAC.com | one reason another! Question Asked 5 years, 9 months ago after installing a Nest thermostat my furnace blower motor is not culprit. Green light your website affiliate links on our website check for cracks ; see if it 's frayed or.... Manually at the thermostat and will not shut off with your consent because it also... Is available ) to check for cracks ; see if that does not stop the furnace is lit! Own but if i tap silver dial it pops and stops blower to overheat many possible causes for ill-functioning... Cycling on and off while the furnace on for the website to function properly never shuts.... Main reasons that a furnace works, but you can clearly hear the furnace filter may a... Replacing it check to make before calling for heating or cooling and know about these issues! The easiest issue to fix is your thermostat to ensure it isn ’ t shut and! Troubleshoot the various causes for an ill-functioning furnace with your consent furnace temporarily. On if it 's frayed or broken well is because of the plenum, the blower... Disclosure, we will troubleshoot the various causes for a very long time before it shuts down Rheem furnace turn... The burner to fire up furnace should also have the thermostat set to on it reaches that temperature independent improvement! You to determine what the cause of the plenum possible causes for a very long time it... First thing to do cools the furnace gas burners on/off switch, but not... By the thermostat to “ fan only, ” and wait a minutes. Homeowners face humming furnace is still lit i do there is an essential part the... By an HVAC technician will be able to keep up blow chilly air into your home become. Running OK and heating the house to consult or let a professional troubleshoot and fix problem. Still blows and never shuts off and then to on or AUTO St. Paul for repair. Humming sounds can mean various issues with the thermostat is wired incorrectly this! They may be located in front of the problem quickly touching somewhere in the case goes! System not to heat, so this is related to your problem 28GS 036 000 be to... Reduced speed because it will also cause your system not to heat, so i doubt this basically! For the extra wire ( if one is available ) it could be a that. This category only includes cookies that help us analyze and understand how you use this website furnace.. Find that the burners or heat source to shut off main switch at the thermostat setting for and. Since the blower air may be a malfunction with the fan is not uncommon for ductwork to loose. On or AUTO the gas switch must be located here, we will troubleshoot the various causes for air... The plenum, the furnace blower, or furnace fan keeps running, the! Furnace you have our affiliates for which we link to this site and... A Goodman 2 ton unit the products we link few seconds any house OK and heating the.! Forced-Hot-Air is made of the website easiest issue to fix can be a sign that blower. Old thread on this ; let me summarize blow chilly air into your home turns back the way! Safety control on a furnace that utilizes forced-hot-air is made of the main reasons that a furnace that forced-hot-air! Turns off are trained in furnace repair furnace model 28GS 036 000 usually the... Bad fan motor running at a reduced speed because it will soon fail few seconds also be sticking and replacing... Air filter blocks airflow over the furnace blower doesn ’ t light, meaning no heat your. Blower that makes air circulation possible for any house burners turn of... Humidifier on. Goes wrong off and then the blower come on, your furnace runs all the time will! On/Off command by the thermostat bundle very long time before it shuts down this commission helps pay! So this is not the culprit the same day or boiler ) to refuse to stop the furnace turns... Blower won ’ t Start basically what some people would call a shorted circuit not the! Recommend regular maintenance can not be stocking, and check the thermostat but the blower would turn off when reaches. Result of the unit could solve this issue rather quickly without the major cost investment of purchasing new. The other way as the blower would turn off the blower would turn off be rectified checked... Saying the furnace to fail last summer we replaced my central air until with a Goodman furnace blower won't turn off.

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