PC case fans constantly turning on and off.

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  • sunfire0816
    PCHF Member
    • Nov 2019
    • 5

    #1

    PC case fans constantly turning on and off.

    I built a PC roughly 3 months ago. Everything was working perfectly fine. Then about 2 weeks ago, my case fans started turning on, ramping up to 100%, and then shutting off. They used to run at low RPMs until I put a heavier load on the computer, then they would increase speed. Now they turn on and turn off randomly. How do I fix this issue?
  • veeg
    PCHF Director
    • Jul 2016
    • 8977

    #2
    Hello

    Could be your psu.. Just how long will the pc stay on? Assuming that is what you meant when shutting off.

    Comment

    • sunfire0816
      PCHF Member
      • Nov 2019
      • 5

      #3
      Originally posted by vger
      Hello

      Could be your psu.. Just how long will the pc stay on? Assuming that is what you meant when shutting off.
      It’s not the PC, it’s only the case fans that are turning on and off. The PC works just fine aside from the 4 case fans.

      Comment

      • veeg
        PCHF Director
        • Jul 2016
        • 8977

        #4
        Ok..so are the fans shutting down completely or just lowering rpm’s?

        Comment

        • sunfire0816
          PCHF Member
          • Nov 2019
          • 5

          #5
          Shutting down completely

          Comment

          • veeg
            PCHF Director
            • Jul 2016
            • 8977

            #6
            So when they shut down,you do have to restart the pc …correct?

            Comment

            • sunfire0816
              PCHF Member
              • Nov 2019
              • 5

              #7
              Nope, they just turn off, and then will start right back up again. And keep repeating that. If I turn the PC off and turn it back on, the fans start all over again of turning on and turning off, and turning on and turning off

              Comment

              • veeg
                PCHF Director
                • Jul 2016
                • 8977

                #8
                Could be a temp spike..

                Download this… Download Speccy | Find your computer specs, free! …free version

                To post… CCleaner Support Community

                If you can guess a time when the fans will shut down,run speccy prior to that..all in the timing…

                Comment

                • sunfire0816
                  PCHF Member
                  • Nov 2019
                  • 5

                  #9
                  So, I found out, the two headers I had my fans plugged into would only receive power when the CPU usage went up, regardless of how much. Then once the CPU usage dropped back down, those headers would no longer receive power causing the fans to shut off.

                  Comment

                  • veeg
                    PCHF Director
                    • Jul 2016
                    • 8977

                    #10
                    So if this setup is what you want,it looks like it is working like it is suppose to.. Or find a different power port on your mobo..( like an auxiliary power port)

                    Comment

                    • system
                      PCHF Owner
                      • Jan 2015
                      • 7636

                      #11
                      There is probably some fan settings that can be adjusted in the bios to customize this behaviour?

                      Comment

                      • phillpower2
                        PCHF Administrator
                        • Sep 2016
                        • 15205

                        #12
                        Any update sunfire0816?

                        Comment

                        • phillpower2
                          PCHF Administrator
                          • Sep 2016
                          • 15205

                          #13
                          Thread closed due to lack of feedback from the OP.

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