Hi Wilbert! To successfully connect your HW-T510 subwoofer, we recommend trying to manually re-pair the sub to the soundbar with the following steps:
1. Press and hold ID SET on the rear of the subwoofer for at least 5 seconds.
• The red indicator on the rear of the subwoofer turns off and the blue indicator blinks.
2. Press and hold the Up button on the remote control for at least 5 seconds.
• The ID SET message appears on the display of the Soundbar for a moment, and then it disappears.
• The Soundbar will automatically power on when ID SET is complete.
3. Check if the LINK LED is solid blue (connection complete). The LINK LED indicator stops blinking and glows a solid blue when a connection is established between the Soundbar and the Wireless Subwoofer.
For more help, please contact Samsung TV Support at 1-800-SAMSUNG, available 8AM - 12AM EST, 7 days a week. ^Gina