You indicated you have already done this, so this is not the problem. A dirty air filter blocks airflow over the furnace’s heat exchanger, causing it to overheat. 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). Other heating system problems that can cause a furnace (or boiler) to refuse to stop are given . 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. The side effect has been that the furnace blower will not shut off. The problem is that I have the thermostat set to 66°F and it does not turn off when it reaches that temperature. My furnace is running OK and heating the house. It will also cause your system NOT to heat, so I doubt this is related to your problem. Component changeouts did not make a difference in it's operation. Locate the blower compartment with the inspection window. 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). So we’ll help you troubleshoot this problem quickly. First, your temperature may be set too high. It is an older furnace, and I have checked the thermostat settings. Cleaning the debris out of the unit could solve this issue rather quickly without the major cost investment of purchasing a new blower. 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. I hear the blower come on, but the fan is not turning and another limit switch shuts the gas valve off. You need to replace the switch right away if you think it’s not working. For that reason, it would be best to consult or let a professional troubleshoot and fix the problem. Bad Control Relay or Board - Furnace Blower Fan Won’t Turn Off. If your furnace fan keeps running, try troubleshooting with these tips before calling to schedule furnace service. These links will lead to you purchase a product from another company. The blower is an essential part of the heating system itself. Check whether your fan is set to On or Auto. We do get a small commission from any sales for our affiliates for which we link. All information is provided "AS IS." It won't shut off … The blower motor keeps running. Most HVAC technicians are trained in furnace repair and know about these safety issues and what happens if the controls are overridden. They have turned off the main switch at the thermostat but the blower continues to blow. Viewed 48k times 2. Inspect your blower if your furnace won’t start. Don’t try to survive all season without a furnace. This commission helps us pay for the overhead of running this website. A set temperature above 80 degrees strains almost any furnace, especially in a … If that does not stop the furnace blower, switch off the thermostat. 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. The first thing to do is check the thermostat. 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. The solution to this problem is to replace the thermostat. You may freely link Once the thermostat is satisfied it turns back the other way as the blower cools the furnace back down. We'll assume you're ok with this, but you can opt-out if you wish. About a month ago we had... My gas furnace makes multiple attempts and then start. home improvement and repair website. The technician comes out and discovers that the safety switch on the blower door was not engaged, which cut off power to the thermostat. As a Minneapolis homeowner, a broken furnace during winter may seem like the end of the world. DoItYourself.com®, founded in 1995, is the leading independent The Home Comfort Book: The ultimate guide to creating a comfortable, healthy, long lasting, and efficient 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. 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. Contact a heating and cooling company in St. Paul for furnace repair. When you raise the thermostat to a warmer temperature, the furnace blower will turn on after about 30 seconds. 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