Boss BF-2 Help

So I just bought an 80’s Japanese green label BF-2 on Reverb. It arrived today. Powered it up, and the rate knob doesn’t seem to do anything. It’s got an ACA sticker on it, so I’m powering it with the 12v setting on my Voodoo Lab Pedal Power 2 Plus. It doesn’t feel right, and I’m wondering if I should request a refund or if it’s fixable.