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Computrainer Troubleshooting

If your Computrainer isn't showing up in Zwift or is dropping out and showing "No Signal" on the pairing screen, it's can usually be solved with one of the following steps: 

  • Make sure you've installed the FTDI driver for your OS as described in our setup article.
  • Close all other cycling programs, especially Racermate and Suunto software.
  • Make sure the cables are plugged into the correct ports on the head unit.
  • Check the version number of your head unit (unplug the power cord, plug it back in). We've received multiple reports that ver. 25.33 doesn't connect. In this case, you may need to upgrade your head unit chip. Update: Racermate has discontinued Computrainer products; these are no longer available.
  • Reset the FTDI driver by closing Zwift, unplugging the Computrainer from the computer, plugging it into a different USB port (if not possible, plug it into the same one), and then restarting Zwift.
  • If you've run Zwift and connected your Computrainer successfully before, try uninstalling and reinstalling Zwift and/or resetting your preferences by deleting your prefs.xml file in your Documents\Zwift folder.

Mac Sierra 10.12 Users

If you're on a Mac with OSX 10.12 and your Computrainer worked before upgrading your OS, it's possible the driver is experiencing conflicts. In order to fix this, follow these steps:

  1. Close Zwift and unplug the Computrainer.
  2. Uninstall/delete all the FTDI driver files by following these instructions (starting on page 8).
  3. Run this command in Terminal to restart the Apple-provided driver "sudo kextload -b"
  4. Plug the Computrainer back in, then start Zwift.

If it's still not working after following those steps, unplug the Computrainer and close Zwift again, reinstall the FTDI driver for your OS, then try again.


If you're still having problems with your Computrainer after following those steps, please open a support ticket, and we'll be happy to help you out.

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