LG Oven Error Code F1

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 10, 2026

⚠ High Severity 🔧 Easy DIY

Oven temperature sensor open circuit

The most common cause of the F1 error on a LG oven is sensor failure (open circuit) (~65% of cases); start with: test the sensor.

💰 DIY cost: $25–$55 👨‍🔧 Pro cost: $150–$300 Save $125+ by doing it yourself

LG Oven error code F1 on the display panel — How the F1 code appears on a LG oven display

What Does Error Code F1 Mean on a LG Oven?

Oven temperature sensor open circuit.

F1 fires when the control board reads an open circuit on the oven's resistance temperature detector (RTD), meaning the sensor loop shows infinite resistance instead of the roughly 1,080 ohms expected at room temperature. Because safe bake and broil control depends on continuous temperature feedback, the board locks out heating. This differs from shorted-sensor or out-of-range readings flagged by related codes, where resistance is measurable but incorrect rather than completely broken.

Models affected: LG electric and gas ranges/ovens using an RTD temperature sensor, including models such as LREL6325F and LRGL5825F

What owners report: Owners commonly report F1 appearing at startup or partway through a bake cycle, sometimes with the oven refusing to heat at all. A loose or corroded sensor connector can trigger a false alarm, and many report that simply reseating the connector or swapping the inexpensive sensor clears the code.

What Causes Error Code F1?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

1

Sensor failure (open circuit) 65% of cases
2

Connector loose or corroded 25% of cases
3

Wiring harness damaged 10% of cases

How to Fix LG Oven Error Code F1

🔧 Easy DIY Est. time: 10–20 min

⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.

1

Test the sensor

Disconnect the sensor and test resistance. LG oven sensors read approximately 1,080 ohms at room temperature (75°F). An open circuit (OL/∞) means sensor failure.

🔩 Multimeter
2

Check the connector

Reseat the connector at both the sensor and the control board.
3

Replace the sensor

The sensor is in the upper-back of the oven cavity, secured with 1–2 screws.

🔩 LG oven temperature sensor ($25–$55)

⚠️ Allow oven to cool completely before reaching inside.

How to Reset Error Code F1

After replacing sensor, turn on and test with a 350°F bake cycle.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

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When to Call a Professional

If new sensor doesn't resolve F1, the control board temperature input has failed.

Average professional repair cost for this issue: $150–$300

Related Error Codes

Oven over-temperature — exceeded maximum safe temperature

🛑 Critical — Stop Using

Oven temperature sensor short circuit

⚠ High Severity

Same Code on Other Brands

Error code F1 appears on these other brands too. See every brand that shows F1 →

Samsung Microwave F-1

Keypad membrane failure — dead or stuck key

Whirlpool Dryer F01

Main control board failure

Whirlpool Oven F1

Control board failure

GE Appliances Oven F1

Electronic control (ERC) failure — loss of element relay backup protection

Find Replacement Parts

Use these links to find the exact replacement parts for your LG Oven:

Step-by-step video guides

External links — ApplianceErrors.com is not affiliated with these retailers.

More LG Oven Error Codes

F11 Heat error — oven failed to reach temperature in time F19 Temperature sensor error — sensor or wiring fault HS Hot Surface indicator — surface still hot (not a fault) PF Power failure — unit lost power during operation (not a fault) Sb Sabbath Mode active — controls intentionally disabled (not a fault) F5 Door latch failure during self-clean cycle

Frequently Asked Questions

Can I keep using my LG Oven when error F1 appears? +

It is not advisable. The oven may still power on, but running it while F1 is active can worsen the sensor fault or damage related parts. Treat it as a soon-as-possible repair.

What most commonly causes F1 on a LG Oven? +

Across reported LG oven repairs, the most frequent is sensor failure (open circuit) (65% of cases), connector loose or corroded (25%), then wiring harness damaged (10%). Check them in that order before replacing any parts.

F1 keeps coming back after a reset — what should I check next? +

A reset only clears the stored F1 fault; if it returns, the sensor problem is still present. Move on to the physical checks — test the sensor, then check the connector — since the code will reappear until the root cause is resolved. This is a beginner-friendly job needing only basic hand tools.

How much does it cost to fix LG Oven error F1? +

A DIY repair typically runs $25–$55 in parts, versus $150–$300 for a professional service call, so handling it yourself saves around $125. Expect the work to take about 10–20 minutes.

Which LG Oven models show error F1? +

F1 is documented on LG electric and gas ranges/ovens using an RTD temperature sensor, including models such as LREL6325F and LRGL5825F. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

• LG Support — Help Library — official manufacturer documentation
• Our editorial & verification policy

Content verified against manufacturer service documentation. Last verified: June 10, 2026.

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