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LG·ovenhigh severity
LG Error Code F3
Open oven temp sensor
Common Causes
- 1Sensor disconnected
- 2Wiring damage
Step-by-Step Troubleshooting
- 1
Verify the oven temperature sensor (RTD probe) is securely mounted in the rear wall of the oven cavity — the mounting screws may have loosened from thermal expansion cycling
- 2
Check the sensor wire connection at the control board — pull the oven away from the wall and access the rear panel to locate the sensor connector
- 3
Test the sensor resistance from the control board connector (disconnect it first) — at room temperature expect approximately 1080 ohms; open circuit confirms a broken sensor or wire
- 4
Trace the sensor wiring for breaks, especially where it passes through the oven insulation and the cabinet rear wall — thermal cycling can fatigue the copper conductors
- 5
If the wiring is intact, flex the sensor wire gently while monitoring resistance — an intermittent open indicates a fractured conductor inside the insulation
Pro Diagnostic Tip
LG oven temperature sensors use RTD (Resistance Temperature Detector) technology, not thermistors. The resistance increases linearly with temperature: approximately 1080 ohms at 77F, 1300 ohms at 350F, 1500 ohms at 550F. A sensor reading that is correct at room temp but open at operating temperature has a hairline crack in the platinum element.
You Might Also Notice
- •Oven will not heat at all
- •F3 error appears immediately when bake is selected
- •Oven temperature wildly inaccurate
- •Error appears only after oven heats up for a while
Parts, Cost & Difficulty
Repair Difficulty
Moderate — Some Experience NeededEstimated Repair Cost
$120–$230
Parts + labor. Free diagnosis with repair.
Parts That May Need Replacement
MEE62002708 (Temperature Sensor/RTD Probe)EAD63928906 (Sensor Wire Harness)
Do You Have the Right Tools?
Combustion analyzer ($300), igniter tester ($120), temperature calibrator ($150), and gas pressure manometer. Our technician arrives with $15K+ in professional tools — your diagnostic is free.
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Safety First — Know the Risks
Gas ovens involve live gas lines — a loose connection creates explosion and carbon monoxide risk. Electric ovens run on 240V circuits. Our techs are licensed and insured — let them handle the risk.
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Get Professional Help Now
Error code F3 is a high-severity issue that can cause further damage to your oven if left unresolved. A licensed technician can diagnose and fix it the same day.
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Frequently Asked Questions
What does LG error code F3 mean?
LG error code F3 indicates: Open oven temp sensor. This is a high-severity issue affecting your oven.
How do I fix LG error code F3?
Verify the oven temperature sensor (RTD probe) is securely mounted in the rear wall of the oven cavity — the mounting screws may have loosened from thermal expansion cycling Then, Check the sensor wire connection at the control board — pull the oven away from the wall and access the rear panel to locate the sensor connector Then, Test the sensor resistance from the control board connector (disconnect it first) — at room temperature expect approximately 1080 ohms; open circuit confirms a broken sensor or wire There are 2 more steps — see the full troubleshooting guide above. This repair typically requires professional tools and expertise.
How do I know if my oven has error F3?
Besides the error code on the display, common signs include: Oven will not heat at all; F3 error appears immediately when bake is selected; Oven temperature wildly inaccurate. If you notice any of these symptoms, check your oven's display panel for error code F3.
How much does it cost to fix LG F3?
Repair costs for LG F3 typically range from $120 to $230 depending on the specific cause and parts needed. EasyBear offers free diagnosis when you proceed with the repair. Call (415) 795-7300 for a same-day appointment.