LG Oven Error Code F13

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

1. 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.
2. Power cycle the oven: Turn the breaker off for 60 seconds and back on. Some control modules clear temporary faults after a reset.
3. 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.
4. 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.
5. 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.
6. Swap or replace the sensor: If the sensor is out of range or intermittent, replace it with the exact OEM part or an approved equivalent. After replacement, restore power and verify error clears and oven heats correctly.
7. Check the control board: If the sensor and wiring check out, the main control board may be malfunctioning (failed ADC, relay, or communication trace). Inspect the board for visible damage (burn marks, bulging caps). Replacing the control board or calling service may be required.
8. Test after repair: Run the oven at a set temperature and monitor stability. Use an oven thermometer to verify accuracy and ensure the error does not return.
9. When in doubt, contact LG service or a certified technician: If troubleshooting steps don’t clear the code, professional diagnosis is recommended to avoid misdiagnosis and unsafe repairs.

Maintenance / Prevention Tips

• Check and clean the sensor connector annually to prevent corrosion and poor contact.
• Avoid bumping or striking the internal temperature sensor when loading or cleaning the oven.
• Wipe spills promptly — acidic or greasy spills can corrode connectors over time.
• Use the oven’s self-clean carefully; follow the manual to avoid exposing wiring to excessive heat.
• Inspect the oven wiring harness during routine maintenance visits for signs of wear or heat damage.
• Replace a sensor with the OEM-specified part to ensure correct resistance and calibration.
• Keep ventilation openings and cooling fans clear so the control board stays within operating temperatures.
• Don’t operate the oven with interior lights or panels removed — exposed wiring can overheat or get damaged.
• Use a quality surge protector for kitchen circuits if your area is prone to severe electrical storms (note: large appliances often require dedicated circuits and may not be compatible with simple plug-in protectors; consult an electrician).
• Have the oven inspected if you notice irregular heating or repeated codes — early attention prevents larger failures.
• Avoid DIY electrical repairs unless you have the tools and knowledge; small mistakes can cause recurring faults.
• Keep a copy of the model’s service manual or wiring diagram to speed diagnosis if a problem occurs.

FAQs

Conclusion / Safety Notice

F13 is usually a temperature-sensor or sensing-circuit issue that should be addressed promptly to restore safe, consistent oven operation. Always disconnect power before attempting internal inspections or repairs. If you’re unsure about electrical work, if the fault returns after replacing the sensor, or if you see signs of board damage (burns, smoke, or melting), stop and contact a qualified appliance technician or LG-authorized service.

When repairs are within your skill set (basic part swap, connector cleaning), take appropriate precautions: shut off power, use insulated tools, and verify the correct replacement part. For control-board faults, persistent errors, or any sign of electrical damage, seek professional help to avoid injury or further damage to the appliance.