LG · Refrigerator
LG Refrigerator 1F Error Code
Same as IF—ice fan failure
What this error means
1F is the numeric shorthand for the ice maker fan fault also labeled Er IF. The ice compartment fan did not reach commanded speed—identical troubleshooting path as IF.
How 1F is detected
When 1F appears on a LG refrigerator, the control board has confirmed that water did not leave the machine within the programmed drain window. On LG LRMVS3006S, LG LFXS26596S, 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 1F calls are resolved without parts: perform full manual defrost with doors open 8+ hours. 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 1F 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 bound fan blades
- Failed ice duct fan motor
- Recurring defrost failure icing the fan weekly
- Power glitch displaying 1F once without repeat
Step-by-step fixes
- 1Perform full manual defrost with doors open 8+ hours
- 2Confirm model shows 1F or IF interchangeably in manual
- 3After thaw, run ice maker test fill if available
- 4Replace fan motor if no spin after defrost
When to call a technician
Chronic 1F/IF pairs with warm freezer corners—book defrost system inspection.
Affected models
- LG LRMVS3006S
- LG LFXS26596S
- LG LRFXS2503S
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use refrigerators to prevent 1F from lint and food debris buildup.
- Record when 1F 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 1F; LG uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting 1F; reversed plugs on pumps and valves cause immediate repeat faults.