There is no sound or sound is heard from only one side of the wireless headset (WF-H800)

If there is no sound, or a sound is only heard from only one side of the headset, follow these steps:

• Reset the headset.
  NOTE: Device registration (pairing) information and other settings will be retained. 
• Turn up the volume of the connected device.
  Press the button on the left unit once during music playback to increase the volume by 1 step.
• If using an app with the connected mobile device, check with another app.
• Check if the Bluetooth connection is established with the device you are connecting to.
• Check that the connected device is playing music.
• Charge the headset.
  NOTES:
  • When charging, set the headset in the charging case and close the lid.
  • Connect the charging case to an AC outlet or computer using the supplied USB Type-C cable.
• Initialize the headset.
  NOTE: This operation resets the headset to the factory settings and deletes all pairing information. Delete the pairing information for the headset from the device and then pair them again.