Hi jucaviana1,
Thanks for the post, and welcome to the community.
Just to confirm, have you checked the five pairs of speaker wires that go from the bass module to the Onkyo receiver? As well, the round LFE connector is plugged in?
If you've checked all connections and the issue still persists, I would recommend contacting your local support center via phone to arrange for service. Click on THIS link, select your country, and scroll down to "Contact Us".
Best Regards,
Brandon - Community Support