The first failure suspect is the water inlet valve (#800 on the
break down diagram). You can check the solenoid resistance (about 180 Ohms) but even if the reading is good it could be stuck in close position. There is a small chance for the control board to be bad too. I would recommend to replace the water inlet valve first.
- The part number for the water valve is
AP3192626
Here are the break down diagrams for the GE refrigerator
Model PSS27SGNABS
Gene.