LG · Oven
LG Oven F13 Error Code
Internal temperature mismatch
What this error means
F13 indicates mismatched temperature readings between sensors or between sensor and expected rate of rise—used on dual-sensor convection models when probes disagree beyond tolerance.
How F13 is detected
When F13 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 F13 calls are resolved without parts: run standard bake without convection to see if f13 is convection-only. 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 F13 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
- Secondary convection sensor failed
- Primary sensor drifting high vs secondary
- Harness swap during repair connecting wrong probe
- Board algorithm fault after firmware glitch
Step-by-step fixes
- 1Run standard Bake without convection to see if F13 is convection-only
- 2Breaker reset five minutes
- 3Avoid opening door repeatedly during preheat when testing
- 4Record whether F13 appears at start or mid-cycle
When to call a technician
Dual-sensor models need professional comparison of both probes against LG charts.
Affected models
- LG LREL6325F
- LG LRG4115ST
- LG LDG4315ST
Prevention & maintenance
- Clean drain filters and hose terminations monthly on high-use ovens to prevent F13 from lint and food debris buildup.
- Record when F13 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 F13; LG uses multiple revisions with different harness lengths and board firmware.
- Photograph wiring connector orientation before disconnecting any component while troubleshooting F13; reversed plugs on pumps and valves cause immediate repeat faults.