LG Oven Error Code F13 — What it Means
The LG oven error code “F13” typically indicates a problem with the oven’s temperature sensing or temperature-sensing circuit. In many LG ranges and built-in ovens this code appears when the control board detects an abnormal thermistor/temperature sensor reading (open, shorted, or out-of-range) or a communication/board fault tied to the sensor circuit. When F13 occurs the oven may refuse to heat, may heat incorrectly, or may shut down intermittently as a safety precaution.
Why it occurs and how it impacts you: common triggers include a failed oven temperature sensor, damaged wiring or connectors, or a failing main control board. User impacts range from inconsistent baking or roasting, longer or unpredictable cook times, inability to reach the set temperature, and in some cases a locked-out heating function until the fault is resolved. Because temperature faults can create over- or undercooking and may indicate an electrical fault, it should be investigated promptly to avoid safety risks or food waste.
Common Causes
- Faulty oven temperature sensor (thermistor) — open or shorted element.
- Damaged or loose wiring harness or connector between sensor and control board.
- Failed or intermittent main control board (temperature sensing circuit fault).
- Corroded or dirty sensor connector causing poor contact.
- Recent repairs or self-clean cycle that damaged the sensor or wiring.
- Firmware/communication glitch in the control electronics (less common).
- Incorrect replacement parts installed previously (wrong sensor resistance).
Troubleshooting Steps
- Safety first: Disconnect power to the oven at the breaker before inspecting internal components. Ovens contain high-voltage circuits and heating elements — if you are not comfortable working with live appliances, skip to calling a qualified technician.
- Power cycle the oven: Turn the breaker off for 60 seconds and back on. Some control modules clear temporary faults after a reset.
- Inspect the sensor and wiring: Open the oven and visually inspect the temperature sensor (usually a thin metal probe mounted on the back wall). Check the wire harness and connectors for burns, corrosion, pin damage, or loose connections.
- Measure sensor resistance: With power OFF and the sensor disconnected, use a multimeter to measure the thermistor resistance at room temperature. Compare the reading to the specification in your model’s service manual (many oven sensors are roughly ~1 kΩ at 25°C, but check your manual). An open circuit or wildly out-of-spec value indicates a bad sensor.
- Wiggle test and continuity checks: With power off, check continuity through the harness and connectors. Gently move wiring while checking for intermittent connection that could produce the error.
- Swap or replace the sensor: If the sensor is out of range or intermittent, replace i