this is what Panasonic said The F61 error message indicates there is an issue with the speaker wires. We recommend that you disconnect the cables from the unit and reconnect them one by one to determine if the message remains.Power the unit off and unplug all speaker wires from the subwoofer, then plug the power back in, and turn the unit power back on. you can contact prodvideo@​callcenter.​us.panasoni​c.com you welcome everyone