Subwoofer auto option light is red

I had a friend tell me that my Polk subwoofer is not working right because when its set to Autooption the light is red. When I turn it the ON position it turns green and Standy by is Red. Is it truly not working right when its on Auto.

Note - nothing is hooked up to the subwoofer at all and he said its malfunctioning. Thank you in advance!

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