LG · Oven
LG Oven F8 Error Code
Cooling fan for control board fault
What this error means
F8 indicates the cooling fan that protects the oven control board did not spin when commanded—common after self-clean high ambient temperatures inside the console.
How F8 is detected
When F8 appears on a LG oven, the control board has confirmed that water did not leave the machine within the programmed drain window. On LG LRG4115ST, LG LREL6325F, 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 F8 calls are resolved without parts: allow oven to cool completely with breaker off. 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 F8 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
- Fan blade blocked by grease dust behind the panel
- Failed cooling fan motor
- Fan harness melted near the oven top
- Board not sending fan voltage after surge
Step-by-step fixes
- 1Allow oven to cool completely with breaker off
- 2Listen for a small fan when starting bake—silence suggests F8 cause
- 3Avoid covering vent slots on the backguard
- 4Retry after cooldown before assuming fan motor failure
When to call a technician
Replace cooling fan assembly if no spin with verified 120V at fan plug during service mode.
Affected models
- LG LRG4115ST
- LG LREL6325F
- LG LDG4315ST
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use ovens to prevent F8 from lint and food debris buildup.
- Record when F8 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 F8; LG uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F8; reversed plugs on pumps and valves cause immediate repeat faults.