Sounds just like mine. Are you saying the pedal works as an on off switch for contactor control, but does not adjust current at all, ie if the panel is at 100, you can have 0 or 100. If the panel is at 111 you can have 111 or 0 ? ( nothing in between?)
I have the same problem with my syncrowave 250(ser#KA 910615). No amperage control, I have to set it at the panel. Tried a new reastart and no differents? Wonder if its the circuit card control? Cruiser do you have any ideas what I should look for? Thanks.