https://portland.craigslist.org/clk/tls/d/camas-milw Working but no amperage control

[Accelo]

I purchased a used PowerPro256 yesterday.
Physically it's in new or almost new condition.
It will weld but seems to have no amperage control.
Wide open only. Works on TIG and Stick.
Any ideas?
Where does it have to go for repair?
Thanks
Rick

[performance]

Not sure how to help. Can you clarify your description of symptoms?
There's not enough information.

It will need to be shipped to our Tennessee repair center.