Once I saw that the water fill tube had frozen up, I realized like last time it was probably the water inlet valve not closing completely, drillping a little after a fill and freezing the tube solid - that means time to change the valve to get ice going again. Easy to change, although at first I didn't recognize how the plastic tube end worked, but just press the plastic ring toward the valve to release the plastic tubing, then insert the plastic tube into the new valve and give a slight backwards tug to secure it.