CAT 304C CR S/N OFPK02672 fuel governor question

I replaced the auto idle control 268-0254 about 4 months ago. It worked fine until this afternoon, New operator complained of no power and would not run above idle. I shut down the machine, turned the throttle dial back to idle, turned the key until the buzzer quit, started the engine, turned the auto idle dile up and the engine turned up to speed but would not auto idle down. Do I need to disconnect the battery and wait 1-2 min and hope for reset? If so positive or negitive post first?

CAT 304C CR S/N OFPK02672 fuel governor question