Ice maker is overflowing

Older icemakers have a bar that drops from above your ice bin; once the bin is full the bar is raised and trips turning the ice maker off so that it won't dump. If your's is this style, try manually pushing the free end of the bar upward so that it locks in the upward position. Newer ice makers with the ice bin in the door have a small panel that moves to the open position when the door opens and closes when the door closes. Mine also includes an optical sensor that is visible when this panel is in the closed position. Try placing a non-clear tape over the optical sensor (don't know if that will work or not but worth a shot). If effective in stopping the ice flow then call a repairman. If none of this works, turn off the water supply coming out of the wall to your freezer.