This model has the ice dispenser in the door, but for now I just want it to make ice!

I've had it for a year and the ice maker has not been connected, the previous owner did not have the ice maker hooked up either. So it has had no water in it for a very long time.

When I connect the water supply, it just continues to run into the ice cube tray, over-running and pouring water into the freezer.

It appears to have some kind of control unit that I'm assuming is supposed to allow a finite amount of water into the tray for each cycle. That's not happening, it just runs until I shut off the water supply at the source.

I'm wondering if the valve is stuck from being dry so long, and/or if I can clean or repair it... or if it's a sealed unit that has to be replaced?

This unit has the chilled water dispenser in the door as well, so the water inlet T's off from that unit, one line goes to the freezer and one to the chilled water tank. Appears to be all one unit.