Syncing data between Polar Verity Sense and Polar FlowSync fails

If FlowSync doesn’t start syncing your sensor, try the below steps, one at a time, and then try syncing your sensor again.

Check that the charging contacts of your sensor and USB charging adapter are clean

If your Verity Sense doesn’t charge properly, or if it doesn’t connect to FlowSync, it could be because the charging contacts of your sensor and USB charging adapter are not clean enough.

Before charging and connecting to FlowSync, please make sure there’s no moisture, dust or dirt on the charging contacts of your Verity Sense and USB charging adapter. Gently wipe off any dirt or moisture. Do not use any sharp tools for cleaning to avoid scratching.

The best way to keep the charging contacts of your sensor clean is to rinse the sensor after each training session with lukewarm tap water. The sensor is water resistant and you can rinse it under running water without damaging the electronic components. Clean the sensor with a mild soap and water solution when needed. Do not charge the sensor when it's wet or sweaty.

Check that sensor is correctly placed in the USB adapter, and that the adapter is correctly placed in the USB port

  • Make sure the Verity Sense sensor is placed correctly in the USB adapter. The sensor should be in the USB adapter with the lens facing up so that the contacts on the sensor and the USB adapter meet.
  • Make sure the USB adapter is placed into the USB port correctly. The lens of the Verity Sense sensor is facing up when the adapter is placed correctly.
  • Try the other USB port(s).

Restart FlowSync

Close FlowSync by right-clicking/secondary clicking the icon on your computer taskbar/menubar. Choose Close. Then restart FlowSync from your computer desktop icon/Applications folder.

Make sure you have version 3.0 or newer of the Polar FlowSync software installed. Older FlowSync versions are not compatible with Verity Sense. To check the FlowSync version, click the settings icon on FlowSync and select About. If the FlowSync version is older than 3.0, please download and install the latest FlowSync version at

Restart your computer

Keep your Verity Sense plugged into the computer.

Enable Javascript and cookies in your browser

Javascript and cookies need to be enabled for connection to work. Usually they are enabled by default. See your browser's help for further instructions.

Make sure your computer recognizes your sensor correctly

Windows 10:

  • Open the Settings menu by going to the Start menu and clicking the settings icon (above the Power button). Open the Devices option and then click on the Connected devices/Bluetooth & other devices option.
  • Plug your Verity Sense into your computer. Your Verity Sense should appear under Other devices.


  • Click Apple menu > About This Mac > More Info > System Report > Hardware > USB. Plug your Verity Sense into your computer. Does the list update? Your Verity Sense should be shown on the list.

If your Verity Sense is not shown on the list and/or the synchronization does not start, please reset the sensor.

If these tips didn’t help, see additional help from Troubleshooting Polar FlowSync, or contact your local customer care with a detailed problem description.

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