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). The real solution here is to replace the control board or relay. Air is then heated through the burner that was collected in the plenum. 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. However, in some instances, homeowners find that the furnace fan continuously runs and won’t turn off. Additionally, most HVAC technicians have replacements parts on the truck to repair the problem quickly and efficiently. Of course, different types of humming sounds can mean various issues with the blower. Not sure what year but I was tol... there is a ten year old thread on this; let me summarize. If a limit switch is found to be problematic as described here, we recommend replacing it. 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. I think it is a sensor. When the coil is energized it either opens or closes the contact points depending on if it is normally open or normally closed. If the furnace won’t turn off and blows colder air towards the end of the heating process, you should check the temperature control. The furnace blower must run for 30 seconds after it comes on for the burner to fire up. Locate the blower compartment with the inspection window. my furnace fan wont stop running if i tap the side of furnace it some times will shut off what can i do . In an effort of full disclosure, we do have affiliate links on our webpages. We use cookies to give you the best possible experience on our website. Furnace - Thermostat. Copyright© 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 problem is easily rectified by turning the switch to automatic on the thermostat. I have a 20+ year old forced air gas with central air. This video shows how to fix that. Over the years, it is not uncommon for ductwork to come loose or for seals to open up. We use cookies to give you the best possible experience on our website. I have a very old dial thermostat. That will cause the burners or heat source to shut off and the fan to run until the limit switch closes again. Turn the power back on the furnace. If your furnace wont shut off and you’re worried, don’t panic. Your email address will not be published. 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). 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 your furnace blower doesn’t turn off, there may be a malfunction with the fan relay switch or the thermostat. 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. When you raise the thermostat to a warmer temperature, the furnace blower will turn on after about 30 seconds. Contact a heating and cooling company in St. Paul for furnace repair. 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. Inspect your blower if your furnace won’t start. My furnace is running OK and heating the house. Source. 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? My Furnace Won’t Shut Off. Initially, the burner will turn off and then the blower would turn off as well. These diagnostic steps are for an air handler, blower, or furnace fan that just won't quit running. Solution:. Don’t try to survive all season without a furnace. When you hear the furnace making a humming noise, it could be a sign that your blower won’t last much longer. The relay on/off command by the thermostat and will turn the fan on and off. 14 Mar 2017 by admin. ... Start by turning the furnace off, turn your thermostat to “fan only,” and wait a few minutes. Check to make sure the fan is not in the fan “ON” position on your thermostat. In this case, the fan motor needs replacing. If you see or hear the fan turn on, your blower motor is not the culprit. If they do not have the part, they can usually get the part on the same day. Blower doesn't shut off on its own but if I tap silver dial it pops and stops blower. to this site, and use it for non-commercial use subject to our terms of use. You need to replace the switch right away if you think it’s not working. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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. 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. In case the furnace blower does not turn off and it is not bringing cold air, the furnace is still lit. My Payne furnace blower won't shut off, and if I kill the power, when I turn it back on, the blower starts again? This problem will depend on what type of gas furnace you have. After that, turn the gas off as well. Your fan limit switch is located directly under your furnace hood and controls when your furnace blower turns on and off. Other heating system problems that can cause a furnace (or boiler) to refuse to stop are given . A switch based on the thermostat setting for setpoint and mode. If not, then you will have to pull new thermostat wire from the furnace to the thermostat. For that reason, it would be best to consult or let a professional troubleshoot and fix the problem. My Furnace Won’t Shut Off. Your blower should run constantly until the heating cycle ends. Blower continues to run and the unit will still heat my home. Overtime the ductwork in your home may become loose or seals may open up. After installing a Nest thermostat my furnace blower kept blowing. 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. In case the furnace turns off when the thermostat is … I have a Carrier energy efficient furnace. New blower wont stop nothing else working. When your furnace isn’t actually heating, though, your furnace blower shouldn’t be running at all. View our Privacy Policy here. Change out the green or red for the extra wire (if one is available). Be sure to turn off the electric before working inside the unit. 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. My furnace seems to be heating okay it is just the blower will not shut off. That is a common occurrence and can be a result of the following: Copyright© 2020 HighPerformanceHVAC.com |. A bad fan motor running at a reduced speed because it will soon fail. If the furnace is still lit, do not turn off the blower. 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. 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. I have a very old dial thermostat. These cookies do not store any personal information. More modern gas furnaces will have a control board. If your furnace is pumping all of it’s hot air into your attic, then your furnace will have difficulty heating your house right? If your thermostat is wired incorrectly, this could explain why the unit refuses to shut off. Of course, regular maintenance cannot guarantee the system will operate without a break down during the heating season. The fan limit switch is responsible for turning the blower on and off at the appropriate times. I've replaced both limit switches on my Comfortmaker furnace plus the control board. Good luck and happy heating!!! My furnace is running OK and heating the house. Older thermostat wire can have degraded insulation. On 2017-10-28 by james. suggestions. 1. But, if the switch is bad, they’ll need to replace it. In most cases, when used in a forced-hot-air system, oil, wood, or natural gas are used to fire up the burner. So we’ll help you troubleshoot this problem quickly. Furnace won’t turn on? I hear the blower come on, but the fan is not turning and another limit switch shuts the gas valve off. A thorough cleaning should be enough to eradicate the sound for good. Either way, something is sticking when it should not be stocking, and the device needs to be replaced to correct the problem. DoItYourself.com®, founded in 1995, is the leading independent In case the furnace blower does not turn off and it is not bringing cold air, the furnace is still lit. Lower the thermostat in order to stop the furnace. When the insulation is gone, the wires touch inside the thermostat wire bundle.

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