The headphone volume cannot be adjusted. (WF-C700N)

Follow these steps to troubleshoot this issue:

1. Use the touch sensor to adjust the volume.

   The volume adjustment method depends on whether you set the headphone's button function assignment to the Volume Control. You can check the button function settings on the Sony | Headphones Connect app. See the System tab → Change the button function menu.

   • If the button function is assigned to the Volume Control:
     • To increase the volume: Press the assigned Volume Control button once. The volume increases by one level.
     • To decrease the volume: Press and hold the assigned Volume Control button until the volume is adjusted to the appropriate level.
   • If the button function has not been assigned to the Volume Control:
     • To increase the volume: Press the R (Right) unit button 4 times or more.
     • To decrease the volume: Press the L (Left) unit button 4 times or more.
     Note: The headphone's firmware version must be Ver. 2.0.0 or later.

   The volume can be adjusted

   You can use the headphones to adjust the volume.

   The volume cannot be adjusted

   Go to the next troubleshooting step.

2. Use the Sony | Headphones Connect app to adjust the volume.

   To adjust the volume using the Sony | Headphones Connect app, move the slide bar next to the speaker icon in the Status tab.
   

   The volume can be adjusted

   You can use the Sony | Headphones Connect app to adjust the volume.

   The volume cannot be adjusted

   Go to the next troubleshooting step.

3. Adjust the volume on the connected device.

   For details on how to adjust the volume on the connected device, refer to the device manual or support site.
   Note: Depending on the connected device, the volume may not sync with the headphones. If you cannot get the desired volume by adjusting the headphones or device volume only, adjust the volume on both the headphones and the connected device.

   The volume can be adjusted

   You may need to adjust the volume on the device in some situations.

   The volume cannot be adjusted

   Go to the next troubleshooting step.

4. If the app has the volume settings, try adjusting the volume using those settings.

   The volume can be adjusted

   The issue may have been caused by the app settings.

   The volume cannot be adjusted

   Go to the next troubleshooting step.

5. Reset the headphones.

   Refer to the Help Guide or view the How to reset video:
   
   

   Tip: Learn how to turn captions on or off when watching Internet videos from YouTube

   The volume can be adjusted

   The issue may have been caused by a temporary malfunction.

   The volume cannot be adjusted

   Go to the next troubleshooting step.

6. Initialize the headphones.
   Initialization returns the headphones to the factory settings and all Bluetooth pairing information is deleted.

   Refer to the Help Guide or view the How to initialize video:
   
   

   Tip: Learn how to turn captions on or off when watching Internet videos from YouTube

   The volume can be adjusted

   The issue may have been caused by a temporary malfunction.

   The volume cannot be adjusted

   The headphones may be malfunctioning, and service may be required.