F2 — Upper Oven Thermistor Error
Per LG's official range error-code list, F2 is the Upper Oven Thermistor Error — the upper oven's temperature sensor is reading out of range. (Door-lock faults are separate codes: F10 for the upper oven, F20 for the lower oven.)
- Keep using it?
- Yes, with caution
- DIY difficulty
- Moderate
- Typical cost
- $60-140
- Verified against
- lg.com ↗
The fix
Door lock motor / latch assembly
Oven door latch / lock switch fault
Diagnose first: Self-clean latch motor or its microswitch fails; common after the first few clean cycles.
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How to fix it
- Unplug the range or shut off power at the breaker.
- Locate the upper oven temperature sensor (thermistor), usually mounted on the rear oven wall.
- Inspect and reseat its wiring connector.
- Test the sensor's resistance against LG's spec at room temperature; replace if out of range.
- If diagnosis confirms the fault, replace the upper oven thermistor (typical cost $20-40, about 45 min, moderate DIY).
Why it happens
Typical signs: F2 shown on the display · Oven temperature reads incorrectly or oven will not heat properly
- Most likely: Upper oven thermistor (temperature sensor) The sensor has failed open/shorted or is reading out of its expected range.
- Thermistor wiring or connector A loose or damaged connection between the thermistor and the control can produce the same fault.
Other parts sometimes needed
If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.
- LG range upper oven temperature sensor (thermistor) Common replacementAmazon →
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: lg.com.