LG Oven F24 Error: Steam thermistor fault (open or shorted)
LG oven error — here’s what you need to know. The F24 error code on your LG oven indicates steam sensor open or short — the steam thermistor in a steam oven is reading outside its valid range. This is a Medium severity issue. What Does F24 Mean on an LG Oven? F24 applies specifically […]
~50%
DIY Fixable
From $50 (thermistor) — $350 (steam generator assembly)
Typical Repair Cost
1–3 hours
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. Standard baking and broiling are unaffected and safe to use while F24 is present. Only the steam cooking function is disabled. Do not attempt to override or bypass the steam circuit to force steam cooking.
Can I reset the code?
Yes. A power reset clears F24 from the display. If the thermistor connection is secure and scale is not the issue, the code will return when steam mode is used. A reset is not a substitute for thermistor replacement.
When to stop immediately?
Stop if you notice: Stop using steam cooking functions until F24 is resolved — operating the steam system with a faulty thermistor can cause uncontrolled steam generation., Stop and disconnect power if you see water leaking from the oven cavity or steam emitting from unusual locations — possible steam line fault alongside F24..
Symptoms You May Notice
Steam cooking function is unavailable or stops producing steam
The oven's steam cooking mode fails to generate steam — water may be added to the reservoir but no steam is produced during the cooking cycle.
F24 code on display during steam cooking
The F24 fault code appears on the control panel when a steam or combination steam-bake mode is selected or in progress, halting the function.
Steam mode disabled while regular bake operates normally
Standard bake and broil functions continue to work correctly, isolating the fault specifically to the steam-generation circuit monitored by the steam thermistor.
Error appears more often after long steam cooking sessions
The fault may appear intermittently at first, becoming persistent as mineral scale or thermistor degradation worsens with accumulated steam cooking use.
Possible Causes
Failed steam thermistor (open or shorted)
The thermistor bead or internal element has electrically failed — either open (no continuity) or shorted (resistance near zero) — producing an invalid signal to the control board.
Requires ProfessionalMineral scale buildup on thermistor or steam generator
Hard water deposits accumulate on the thermistor surface and inside the steam generator, insulating the sensor and altering its resistance readings beyond the acceptable range.
DIY PossibleLoose or corroded thermistor wiring connector
The thermistor harness connector can loosen or corrode in the humid steam-oven environment, creating an intermittent or permanent open circuit on the thermistor signal line.
DIY PossibleSafe Checks You Can Do
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1
Run the oven's descale cycle
Follow LG's descaling procedure for your specific steam oven model (typically filling the water reservoir with a citric acid or white-vinegar solution and running the descale program). Heavy scale can interfere with thermistor readings and cause F24.
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2
Reseat the thermistor harness connector
Disconnect power at the breaker. Locate the steam thermistor (typically inside the steam generator housing or on the steam injection tube — consult your model's service manual). Unplug and firmly re-seat the wire harness connector to ensure a clean connection.
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3
Perform a power reset and retest steam mode
Restore power after 5 minutes. Select a steam cooking mode and observe whether F24 returns. If steam generates normally, the fault was likely a loose connector or transient scale interference.
When to Call a Professional
Contact a qualified technician if:
- F24 persists after descaling and reseating the connector — thermistor component failure requires measurement and replacement by a technician.
- Visible mineral scale deposits inside the steam generator that did not clear with a descale cycle — system may need professional flushing.
- Steam oven produces inconsistent or excessive steam before F24 appears — steam generator or thermostat fault alongside sensor issue.
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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