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Appliance Error Codes

What Does F1 Error Mean on LG LSGL6335F?

Error F1 on LG LSGL6335F: Oven temperature sensor open circuit — thermistor open for more than 1 minute du. Follow the troubleshooting steps below to diagnose and fix this range issue. The F1 error code on your LG LSGL6335F range indicates the oven temperature sensor (thermistor) has an open circuit and has not returned a valid reading for more than 1 minute during a cooking cycle. The oven cannot safely maintain temperature without a working sensor and will disable heating. Press CLEAR/OFF and perform a circuit breaker reset first — if F1 clears, monitor for recurrence. If F1 returns, the sensor requires replacement. ## What Does F1 Mean? The F1 error means the LSGL6335F control board detected that the oven temperature sensor is in an open circuit state — its resistance reading has exceeded the upper threshold that indicates a broken or disconnected sensor. LG ranges use an NTC thermistor as the oven temperature sensor. A healthy sensor at room temperature reads approximately 1,080 to 1,100 ohms. An open circuit reading (OL on a multimeter, indicating no continuity) triggers F1. The control board monitors the sensor continuously during cooking — if the open condition persists for 1 minute, F1 is displayed. On the LSGL6335F, the oven sensor is mounted in the upper-rear corner of the oven cavity. The sensor probe extends into the oven interior and its lead wires pass through the back wall to the control board. A broken wire in the harness or a loose connector can produce the same F1 reading as a failed sensor probe. ## Possible Causes 1. Physically broken oven temperature sensor probe — internal break in the thermistor element from thermal stress or self-clean cycle heat 2. Disconnected or loose wiring harness connector between the sensor and the control board 3. Broken wire in the sensor harness from vibration or high heat exposure near the oven back wall 4. Failed control board temperature sensor input circuit — rare ## Troubleshooting Steps | Step | Action | Expected Result | |------|--------|-----------------| | 1 | Press CLEAR/OFF on the LSGL6335F control panel, then trip the circuit breaker for 30 seconds and restore power; if F1 clears and does not return, the fault was transient | F1 does not return after reset | | 2 | Disconnect all power; locate the oven temperature sensor in the upper-rear corner of the oven cavity; it is a metal probe held by one or two Phillips screws | Sensor is located and accessible | | 3 | Disconnect the sensor harness connector and measure resistance with a multimeter; at room temperature the sensor should read approximately 1,080 ohms; OL (open circuit) confirms the sensor has failed | Sensor resistance confirms failure — OL reading | | 4 | If the sensor tests good (near 1,080 ohms), trace the harness from the sensor to the main control board and check for a break or loose connector; test harness continuity | Harness is intact or break is located | | 5 | Replace the sensor if it is open-circuit; replace the harness section if a break is found; verify the part number for your exact LSGL6335F model before ordering | Correct replacement part is installed | | 6 | Restore power and run a bake cycle at 350°F; verify the oven heats normally and F1 does not return | Oven heats to set temperature without F1 | Always disconnect power at the circuit breaker before removing the oven temperature sensor or accessing any wiring inside the range. ## When to Call a Technician Contact LG authorized service if: - The sensor and harness both test good but F1 persists — the control board sensor input circuit has failed

  • F1 appeared immediately after a self-clean cycle — high self-clean temperatures can cause sensor failure Professional repair costs for F1 issues typically range from $80 to $250 depending on the specific component and your service region. ## Frequently Asked Questions ### What resistance should the LG oven temperature sensor read? At room temperature of approximately 72°F (22°C), the LG oven temperature sensor should read approximately 1,080 to 1,100 ohms. An open circuit (OL on the multimeter) triggers F1. A reading well below 900 ohms indicates a shorted sensor and triggers F2. The sensor resistance decreases slightly as oven temperature rises, which is how the control board tracks the actual oven temperature.

Can the F1 error appear if the sensor wire is just loose? Yes. A loose or partially disconnected harness connector at the sensor end or at the control board end produces the same open circuit reading as a physically broken sensor. Before ordering a replacement sensor, disconnect the connector and reseat it firmly. Test continuity through the full harness from the sensor probe to the board-side connector to rule out a loose connection.

Section titled “Can the F1 error appear if the sensor wire is just loose? Yes. A loose or partially disconnected harness connector at the sensor end or at the control board end produces the same open circuit reading as a physically broken sensor. Before ordering a replacement sensor, disconnect the connector and reseat it firmly. Test continuity through the full harness from the sensor probe to the board-side connector to rule out a loose connection.”

My LG LRE3061ST shows F1 after self-clean — is this common? Yes. F1 appearing after a self-clean cycle is a well-documented LG range issue. The self-clean cycle heats the oven above 850°F, which stresses the oven temperature sensor. The rapid thermal expansion and contraction over many self-clean cycles eventually causes an internal break in the thermistor element. Replacing the sensor resolves the issue permanently.

Section titled “My LG LRE3061ST shows F1 after self-clean — is this common? Yes. F1 appearing after a self-clean cycle is a well-documented LG range issue. The self-clean cycle heats the oven above 850°F, which stresses the oven temperature sensor. The rapid thermal expansion and contraction over many self-clean cycles eventually causes an internal break in the thermistor element. Replacing the sensor resolves the issue permanently.”

Does F1 mean my LG range oven will not heat at all? Correct. The LSGL6335F control board disables oven heating when F1 is active because it cannot safely monitor oven temperature. The cooktop surface burners (gas or electric) are on a separate circuit and continue to operate normally while F1 is active. Only the oven heating function is disabled. Reference: LG official support documentation (lg.com/us/support) and authorized service guides ### Is it safe to keep using my LG LSGL6335F with error F1? If error F1 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the range with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error F1 on a LG LSGL6335F? Repair costs for error F1 on the LG LSGL6335F range depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a LG-authorized service provider for an accurate estimate based on your specific situation. ### What does error code F1 mean on a LG range? Error code F1 on LG range models indicates Oven temperature sensor open circuit — thermistor open for more than 1 minute during cooking. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.

Section titled “Does F1 mean my LG range oven will not heat at all? Correct. The LSGL6335F control board disables oven heating when F1 is active because it cannot safely monitor oven temperature. The cooktop surface burners (gas or electric) are on a separate circuit and continue to operate normally while F1 is active. Only the oven heating function is disabled. Reference: LG official support documentation (lg.com/us/support) and authorized service guides ### Is it safe to keep using my LG LSGL6335F with error F1? If error F1 does not indicate an immediate safety hazard such as a gas leak, electrical short, or water flooding, you can continue limited use while monitoring the appliance. However, running the range with an active error code increases the risk of further damage. Address the underlying issue as soon as possible. For high-severity errors, disconnect the appliance and contact a qualified technician. ### How much does it cost to fix error F1 on a LG LSGL6335F? Repair costs for error F1 on the LG LSGL6335F range depend on the root cause. DIY fixes such as cleaning filters, resetting the unit, or reconnecting loose wires cost nothing beyond basic tools. If a component replacement is needed, parts and labor from a certified technician are the main expenses. Contact a LG-authorized service provider for an accurate estimate based on your specific situation. ### What does error code F1 mean on a LG range? Error code F1 on LG range models indicates Oven temperature sensor open circuit — thermistor open for more than 1 minute during cooking. This error is detected by the appliance’s internal diagnostic system and displayed to alert the user that attention is needed. Refer to the troubleshooting steps above for guidance on resolving this issue.”