They have had some spotty quality control, unfortunately. I really like mine, I have 4 of them. All tested good. But there are some that seem to just show up broken.
A programming error where you couldn't transmit would get you the "YOU CAN'T DO THAT DUMMY" beep when you key up.
If it's not doing that, and it's just outputting 0W, then yeah, they're probably NFG.