LG Oven Error F18
⚡ Quick Answer: The LG oven error code F18 indicates a malfunction with the lower oven temperature probe, which may be shorted or not detected. This can lead to the o... ✅ DIY Fixable
What Does Error F18 Mean?
The LG oven error code F18 indicates a malfunction with the lower oven temperature probe, which may be shorted or not detected. This can lead to the oven failing to heat properly or displaying inconsistent temperatures. If you see the F18 error on your oven panel, it is essential to check the temperature probe and its wiring for faults or disconnections, as these are common causes of the issue.
Common Symptoms:
- Error F18 displayed on oven panel
- Oven fails to heat properly or start cooking cycle
- Temperature probe reading out of range or not detected
Possible Causes
- Lower oven temperature probe is shorted or faulty (medium)
- Wiring issue between the probe and control board (medium)
- Control board fault affecting probe circuit (low)
How to Fix Error F18
DIY Fix Power Reset and Basic Check
- Turn off and unplug the oven from the power source.
- Wait 5–10 minutes, then plug the oven back in and power on to see if F18 clears.
- Ensure the oven’s probe (if removable) is fully connected correctly.
Technician Only Inspect and Replace Probe and Wiring
- Disconnect oven power.
- Access the oven’s internal temperature probe wiring harness.
- Visually inspect wiring for damage, shorts, or loose connectors.
- Test the probe resistance with a multimeter (compare to expected values per model).
- Replace the probe and/or repair wiring if readings are outside specification.
- Verify control board connections and test for continuity.
Parts needed: Lower oven temperature probe, Wiring harness/connectors
- If the F18 error persists after probe and wiring inspection
- If user is uncomfortable opening appliance panels or lacks proper tools
- If there are signs of electrical damage or burning smell
Next step
Choose the next step for F18
Confirm the diagnosis before ordering. An error code can identify the system involved, but it does not prove that a specific part has failed.
Most relevant component to inspect
Wiring Harness
Connects controls, sensors, motors, and other electrical components inside the appliance.
- Typical part-only price
- $20 - $120
- DIY difficulty
- Medium
- Estimated time
- 30-90 mins
Where can I find the model number?
Check the rating label around the door, lid, frame, rear panel, or inside the appliance cabinet. Use the complete model number, including suffixes.
Verify the complete model and part number on the retailer's compatibility page before ordering.
Other parts options
Check related components first; use model search as a fallback.
Model-compatible Oven parts
Enter the complete model number to browse compatible replacement parts. This is a model-based parts search, not a diagnosis that a specific component failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. We may earn a commission from other qualifying purchases or service requests made through links on this page, at no additional cost to you. Recommendations are based on repair relevance, not commission rate.
Optional routine care
Maintenance supplies
These products support cleaning or routine upkeep. They are separate from the possible repair components above and are not claimed to fix this error code or symptom.
Non-Scratch Cooktop Cleaner
A routine surface-care product. Confirm that it is approved for the specific glass, ceramic, enamel, or stainless finish.
Oven Thermometer
A diagnostic aid for comparing cavity temperature during a controlled check. It does not prove which internal component has failed.
Affiliate disclosure: As an Amazon Associate I earn from qualifying purchases. Recommendations are based on routine-care relevance, not commission rate.
Technical Specifications
| note | The previous model-independent part specification was removed. Verify the full model number and diagnosis in the manufacturer's official parts catalog before ordering. |
|---|---|
| part_number | None |
Common Questions
What does F18 error mean on LG oven?
The F18 error indicates a malfunction in the lower oven temperature probe, causing heating issues.
Can I fix LG oven F18 error myself?
Yes, you can perform a power reset and check the temperature probe connection to troubleshoot the issue.
How much does it cost to fix F18 error?
Repair costs for the F18 error range from ¥5,000 to ¥25,000 for parts, excluding labor.
When should I call a technician for F18?
Call a technician if the F18 error persists after checking the probe or if you notice electrical damage.
Data last verified: 2026-07-31
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