How to re-pair the Sub Woofer to the LG455H Soundbar
To pair/re-pair the sub woofer to the LG LAS455H Sound Bar:
Turn the volume down to Min on the Sound Bar, then using the Sound Bar remote, press and hold Mute for three seconds.
The Sound Bar will show WL Reset.
Press and hold the pairing button on the back of the Sub Woofer for at least 10 seconds – the front led will flash Red/Green then flash green constantly.
Unplug both the Sub Woofer and sound bar for 20 Seconds – Plug them back in at the same time to pair the units.