LG · Oven
LG Oven F12 Error Code
Touch panel communication fault
What this error means
F12 is a touch panel Communication fault distinct from F11—the link between the glass UI and the oven processor failed, freezing buttons or showing garbled temps.
How F12 is detected
When F12 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 F12 calls are resolved without parts: power off five minutes at breaker. 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 F12 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
- Ribbon cable unseated at the display
- Steam from cooktop penetrating the UI flex
- Failed display PCB
- ESD damage after improper board handling
Step-by-step fixes
- 1Power off five minutes at breaker
- 2Dry the control area if steam cleaning occurred recently
- 3Tap buttons gently after power return—avoid hammering glass
- 4Photograph display behavior for the technician
When to call a technician
F12 every power-on needs display assembly or main board replacement.
Affected models
- LG LREL6325F
- LG LRG4115ST
- LG LDG4315ST
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use ovens to prevent F12 from lint and food debris buildup.
- Record when F12 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 F12; LG uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F12; reversed plugs on pumps and valves cause immediate repeat faults.