To save us suggesting what you’ve already tried, please say what you’ve tried and what error messages you get. 

Is it just the Sub that’s “not working”? 

In what way is it not working? Is it visible in your app but not making any sounds?

Yes i can see on my app but not working 

Is the sub still showing in the room it was in or as an used product?

Hi @Satinder 

Welcome to the Sonos Community!

Sorry to hear of the issue you are having with your Sub not playing.

Please remove it from which ever room it is bonded to in the app, then add it back on again.

Settings icon » �room with Sub] » Remove Sub » Remove Sub

Settings icon » �room with Sub] » Add Sub

I hope this helps.