My roomba had warning in its guide that third party accessories may not properly work with the device. I was like pshaw you're just nickel and diming me!

But indeed, the third party brush caused the robot to have all types of errors. Some third party parts did work, just not the brushes. I guess there's some sort of strict size tolerance and the third party ones were a bit too big or small.

But I had only myself to blame for that.