LG · Oven
LG Oven F11 Error Code
Communication error between oven PCBs
What this error means
F11 is a Communication Error between the cooktop PCB and oven PCB—often seen during self-clean when both boards must coordinate door lock and heat. The display may freeze or cancel clean mode.
How F11 is detected
When F11 appears on a LG oven, the control board has confirmed that water did not leave the machine within the programmed drain window. On LG LREL6325F, LG LRG4115ST, 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 F11 calls are resolved without parts: turn breaker off ten to thirty minutes per lg service bulletins. 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 F11 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
- Loose ribbon cable between UI and oven board
- Power surge during self-clean high heat
- Moisture on connectors after steam clean
- Failed oven or cooktop sub-PCB
Step-by-step fixes
- 1Turn breaker OFF ten to thirty minutes per LG service bulletins
- 2Avoid starting self-clean until F11 clears
- 3Ensure the range cord is fully seated at the junction box
- 4Note whether F11 appears only in self-clean or all modes
When to call a technician
Persistent F11 after cable inspection requires PCB replacement—model-matched boards only.
Affected models
- LG LREL6325F
- LG LRG4115ST
- LG LDE4413ST
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use ovens to prevent F11 from lint and food debris buildup.
- Record when F11 appears in the cycle and whether it clears after a 60-second power reset on your LG oven—that detail speeds diagnosis if you call service.
- Keep the model and serial number from the rating plate when ordering parts for F11; LG uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F11; reversed plugs on pumps and valves cause immediate repeat faults.