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Problem: Why is my fan blower motor running all the time?

Problem: We have many people ask, “Why is my fan blower motor running all the time. My blower motor will not shut off?” “Why does my fan motor run continuously when I use my furnace?”

Answer: I found a real good Youtube video made by ACServicetech that explains 4 reasons why fan blower motors run continuously. In this video ACServicetech goes over why the Blower Fan Motor Won’t Shut off/Continuously Runs and some of the most common reasons why furnaces or air handlers have this problem. ACServicetech shows step by step Troubleshooting on how to figure out what is causing this problem. This is a great video that I would highly recommend that you watch  if your fan motor is running continuously. Many thanks to ACServicetech for making this informative video! If you have any questions please feel free to email us anytime or respond in the comments section below. We have many heating and air conditioning troubleshooting links, Videos and Resources on the following page: Please click here for more troubleshooting resourcesWe would love to help you out and earn your business! Our email address is: support@arnoldservice.com

4 thoughts on “Problem: Why is my fan blower motor running all the time?

  1. HELP ! WE have a trane model#4YCX3060A1096A air conditioner and gas furnace unit . it will run for about 1/2 hour, and then the gas burner stops . the fan keeps running , but , the burner is off .The tank reads 70% and was filled 2 weeks ago .I turn the thermostat off , and , a few minutes later turn it back on . The furnace lights up for another 1/2 hour [approx.] and does it again . We have no idea of what could be wrong !HELP Please !
    Thank You , hap coman

    1. Hi! This sounds like your furnace might be going off on high limit. I would suggest that you test the safety controls (limit, rollouts, pressure switch) with a voltmeter when the burners go out the next time and see if the furnace is getting too hot and going off on limit. I copied the following from our website. I hope it helps solve your problem. FYI- (For Your Information): A furnace limit is a safety device that is used to cut the gas burners off if the furnace over-heats. If your furnace is going off on limit you might have an air flow problem like a dirty filter, dirty blower, slow blower motor (might need a new capacitor) stopped up evaporator coil or too much gas pressure. All of these can cause the furnace to over-heat and go off on limit. Many times when the furnace goes off on limit the fan blower will continuously blow because the furnace control board senses that the furnace has over-heated and needs to cool down. The only way to get the blower to cut off is to turn off the furnace with the power switch. You can test a limit with a volt meter to see if it is open or not. On most limits, you should get 24 volts from each of the two wires on the limit to a good ground. If the blower motor’s capacitor checks out OK then you might be able to change the blower motor speed to a higher speed so the furnace will not overheat if that is the problem. We have lots of furnace troubleshooting advice on the following page: https://arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ I would suggest going through the troubleshooting flow chart to see what is wrong: https://arnoldservice.com/wp-content/uploads/2014/12/furnace-troubleshooting-flow-chart.pdf We also have lots of troubleshooting questions and answers on the following page: https://arnoldservice.com/furnace-troubleshooting-questions-answers-index/ If you have any specific questions please let me know. Thanks! I hope you can easily find and fix the problem.

  2. Problem: Ignitor only getting 5.6V at terminals. Schematic calls for 120V.
    Trane 90 NG furnace 1997 vintage. W-R control board.

    Any suggestions?

    1. This could be any open safety control like a pressure switch, limit or rollout switch that is open and will not allow the ignitor to light. I would suggest that you check to make sure all the safety controls are closed. If all the safety controls are closed and you are still not getting the right voltage to the ignitor then this could be caused by a bad relay in the control board. You might need a new control board. We have lots of furnace troubleshooting advice on the following page: https://arnoldservice.com/gas-electric-furnace-troubleshooting-simplified-2/ I would suggest going through the troubleshooting flow chart to see what is wrong: https://arnoldservice.com/wp-content/uploads/2014/12/furnace-troubleshooting-flow-chart.pdf We also have lots of troubleshooting questions and answers on the following page: https://arnoldservice.com/furnace-troubleshooting-questions-answers-index/ If you have any specific questions please let me know. Thanks! I hope you can easily find and fix the problem. Steve

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