Why most GE ice makers are diagnosed by symptom
The automatic icemaker built into a GE refrigerator has no display of its own — the host refrigerator’s own CI (“check icemaker”) alert is the only signal, and otherwise the module is read entirely by what it does: no ice, slow ice, small or hollow cubes, or leaks.
The GE Profile Opal countertop exception
The GE Profile Opal and Opal 2.0 nugget ice makers are a different, standalone product with their own digital display, and can show E1 (water-supply or low-water fault), E2 (temperature-sensor fault), E3 (ice or pump sensor fault, or a pump obstruction), or T3 (a thermistor reading). These codes are specific to the Opal line and should be verified against the exact model’s manual before diagnosing, since they are not part of GE’s built-in refrigerator icemaker system.
No-ice and slow-ice symptoms
No ice at all usually traces to a closed or kinked water supply, low household pressure, a failed inlet valve, or a failed harvest module. Small or hollow cubes point at low water pressure. Bad-tasting ice traces to old water sitting in the line or mineral buildup in the bin.
What to check, and when to call
Confirm the supply shutoff is fully open and clean the bin before suspecting a part. A built-in module showing a persistent CI alert, an Opal showing a recurring E1-E3 code, or any icemaker that will not produce or leaks calls for an experienced, independent technician with the correct OEM or high-quality replacement part — a built-in module is handled as part of refrigerator repair. Browse the symptom guides on the ice maker diagnostics page, then book ice maker repair.