Hi mpmc
The first thing I would check is the coil on the water inlet valve. Remove wires from the coil and check for continuity across terminals. Replace the water valve if the coil is open.
Does the ice maker goes in a harvest? If not, replace the ice maker.
Wait until the ice maker will go in a harvest and check if there is 120V coming to the water valve during the end of the harvest.
If no, replace the ice maker.
If yes, replace the water valve.
- The part number for the water inlet valve
AP3189335
- The part number for the ice maker
AP3853272
- Here are the break down diagrams for the GE refrigerator
Model CTX21DIBRRAA
Good luck.
Gene.