LG Oven Error Code F3

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

⚠ High Severity 🔧 Easy DIY

Oven temperature sensor short circuit

The most common cause of the F3 error on a LG oven is sensor shorted internally (~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 F3 on the display panel — How the F3 code appears on a LG oven display

What Does Error Code F3 Mean on a LG Oven?

Oven temperature sensor short circuit.

F3 fires when the control board measures abnormally low resistance on the oven's RTD temperature probe circuit, near zero ohms instead of the roughly 1,080 ohms expected at room temperature. The board interprets this short as an impossibly high temperature reading and locks out heating to prevent overshoot. Unlike F2, which signals an open circuit or sensor out of range high, F3 specifically indicates a short—either inside the sensor element, a pinched harness grounding to the chassis, or a shorted board input.

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 F3 appearing at startup or partway through a bake or self-clean cycle, sometimes alongside the oven refusing to heat. A pinched or melted wire near the rear sensor connector is a frequent false trigger that mimics a bad sensor, so many find that inspecting the harness before replacing the probe saves an unnecessary part.

What Causes Error Code F3?

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

1

Sensor shorted internally 65% of cases
2

Pinched wiring causing short to chassis 25% of cases
3

Control board sensor input shorted 10% of cases

How to Fix LG Oven Error Code F3

🔧 Easy DIY Est. time: 10–20 min

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

1

Test the sensor

At room temp, LG sensor should read ~1,080 ohms. Near 0 = shorted.

🔩 Multimeter
2

Inspect wiring

Check sensor wiring from probe to connector for any pinch points.
3

Replace the sensor

A shorted sensor cannot be repaired.

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

How to Reset Error Code F3

After replacing sensor, test with 350°F bake cycle.

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

Did this guide fix your appliance?

When to Call a Professional

If new sensor shows correct resistance but F3 persists, control board sensor input is shorted.

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

Related Error Codes

Oven temperature sensor open circuit

⚠ High Severity

Oven over-temperature — exceeded maximum safe temperature

🛑 Critical — Stop Using

Same Code on Other Brands

Error code F3 appears on these other brands too. See every brand that shows F3 →

Samsung Microwave F-3

Touchpad/membrane failure

Whirlpool Oven F3

Open oven temperature sensor — sensor circuit open

GE Appliances Oven F3

Oven temperature sensor open circuit

Haier Refrigerator F3

Defrost sensor failure

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 F3 appears? +

It is not advisable. The oven may still power on, but running it while F3 is active can worsen the sensor fault or damage related parts. Treat it as a soon-as-possible repair.

What most commonly causes F3 on a LG Oven? +

Across reported LG oven repairs, the most frequent is sensor shorted internally (65% of cases), pinched wiring causing short to chassis (25%), then control board sensor input shorted (10%). Check them in that order before replacing any parts.

F3 keeps coming back after a reset — what should I check next? +

A reset only clears the stored F3 fault; if it returns, the sensor problem is still present. Move on to the physical checks — test the sensor, then inspect wiring — 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 F3? +

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 F3? +

F3 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.

← All LG Oven Error Codes ← All LG Error Codes