LG · Refrigerator
LG Refrigerator IS Error Code
Ice maker sensor or position fault
What this error means
IS indicates an Ice maker Sensor or ice system fault—the board did not get expected feedback from the ice maker optics, fill level, or ejector home position.
How IS is detected
When IS appears on a LG refrigerator, the control board has confirmed that water did not leave the machine within the programmed drain window. On LG LFXS26596S, LG LRMVS3006S, and similar variants, the drain pump runs for a fixed interval—often three to seven minutes on washers and dishwashers—while a pressure switch or turbidity sensor verifies the tub or sump is empty. If water remains, the cycle stops to prevent spin with a full tub or overflow on the next fill.
Most IS calls are resolved without parts: set ice maker switch to on inside the freezer. Restricted drain paths mimic pump failure because the impeller spins against a blocked hose or filter. Document whether the pump hums audibly during the drain step; a humming pump with no water movement points to a clogged filter or kinked hose, while silence may indicate a failed pump motor or loose wiring at the harness.
After clearing blockages, run a short cycle and listen at the drain hose for steady water flow. If IS returns on the next load with a clean filter and straight hose, measure resistance at the pump motor connector per the service manual for your model before ordering a replacement pump assembly.
Common causes
- Ice maker turned OFF at the switch
- Ice jam blocking ejector fingers
- Frozen fill cup preventing fill level detection
- Failed ice maker head assembly
Step-by-step fixes
- 1Set ice maker switch to ON inside the freezer
- 2Clear jammed cubes from the ejector with a plastic tool—never metal near the mold
- 3Melt fill tube ice with a turkey baster of warm water
- 4Run a manual harvest if your model supports test mode per manual
When to call a technician
Replace the ice maker assembly if motor hums without ejection after clearing jams.
Affected models
- LG LFXS26596S
- LG LRMVS3006S
- LG LRFXS2503S
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use refrigerators to prevent IS from lint and food debris buildup.
- Record when IS appears in the cycle and whether it clears after a 60-second power reset on your LG refrigerator—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for IS; LG uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting IS; reversed plugs on pumps and valves cause immediate repeat faults.