By red and green you mean that the power indicator LED on the subwoofer is cycling from standby to on and back to standby constantly?
A damaged woofer could trigger the amp to go into protection but it likely would stay off. A problem in the turn on circuit or in the amp itself could be the problem. Either way I hope that the amp is under warranty.
Usually the speaker itself is 5 years but the amp only 1 year. Would need a technician to repair it. Contact CV.