LG Oven Error CF3
⚡ Quick Answer: The LG Oven CF3 error code indicates a malfunction in the RF top sensor, which can result in the oven or cooktop not heating correctly or displaying i... ✅ DIY Fixable
What Does Error CF3 Mean?
The LG Oven CF3 error code indicates a malfunction in the RF top sensor, which can result in the oven or cooktop not heating correctly or displaying inconsistent temperature readings. This issue is typically caused by an open or short circuit in the sensor circuit, triggering the CF3 code when irregularities are detected. To address this, check for any spills around the sensor area and perform a power reset. If the problem persists, further inspection or replacement of the RF top sensor may be necessary.
Common Symptoms:
- CF3 code appears on display when sensor circuit irregularity is detected
- Oven or cooktop may not heat properly or may shut down due to sensor fault
Possible Causes
- RF top sensor open or short circuit (medium)
How to Fix Error CF3
DIY Fix Power reset and basic checks
- Turn off the oven and unplug it from power or switch off the dedicated breaker.
- Wait 2–5 minutes and restore power to see if the error clears.
- Ensure no spills or debris around the sensor area if accessible.
Technician Only Inspect and replace RF top sensor or wiring
- Verify error code with diagnostic tools and access the sensor circuitry.
- Inspect the RF top sensor wiring harness for damage, loose connectors, or shorts.
- Test the RF top sensor for proper resistance; replace the sensor if open or shorted.
- After repair, clear the error code and test oven operation.
Parts needed: RF top sensor (right front cooktop/oven sensor), Sensor wiring harness or connectors
- Error persists after power reset and basic checks
- Visible damage to wiring, connectors, or sensor components
- Uncertainty about safely accessing internal components
Next step
Choose the next step for CF3
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.
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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 CF3 error mean on LG Oven?
The CF3 error indicates a malfunction with the RF top sensor, affecting heating performance.
Can I fix LG Oven CF3 error myself?
Yes, you can try a power reset and check for spills around the sensor.
How much does it cost to fix CF3 error?
Repair costs for the CF3 error typically range from low to medium, including parts and labor.
When should I call a technician for CF3?
Call a technician if the error persists after a reset or if you notice visible damage to components.
Data last verified: 2026-07-31
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