LG Oven Error F21
⚡ Quick Answer: The LG oven error code F21 indicates a potential malfunction within the heating element, which may lead to improper heating or unusual sounds during o... ✅ DIY Fixable
What Does Error F21 Mean?
The LG oven error code F21 indicates a potential malfunction within the heating element, which may lead to improper heating or unusual sounds during operation. To troubleshoot, first ensure the oven door is fully closed and then power cycle the unit by disconnecting it from the electrical supply for 1–2 minutes before restoring power. If the error persists, further inspection of the oven sensor wiring and control connections may be necessary.
Possible Causes
- Heating Element
- Wiring Issues
- Control Board Malfunction
How to Fix Error F21
DIY Fix General basic checks and reset
- Ensure the oven door is fully closed.
- Turn off the oven and disconnect power at the wall or circuit breaker.
- Wait at least 1–2 minutes and restore power.
- Observe if the F21 code returns when powering on.
Technician Only Inspect oven sensor wiring and control connections
- Check wiring harnesses to the temperature sensor and control board for loose or damaged connectors.
- Using a multimeter, verify continuity and proper resistance of the temperature sensor against manufacturer specifications.
- Inspect control board connectors for signs of burn marks or corrosion and reseat or replace as needed.
Parts needed: temperature sensor, wiring harness, control board
- If the error persists after power cycling.
- If any wiring appears burnt, frayed, or damaged.
- If temperature readings from the oven sensor do not fall within expected ranges.
Next step
Choose the next step for F21
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
Temperature Sensor
Monitors the internal temperature to ensure correct operation and prevent overheating.
- Typical part-only price
- $15 - $35
- DIY difficulty
- Easy
- Estimated time
- 15-30 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.
Wiring Harness
Connects controls, sensors, motors, and other electrical components inside the appliance.
Main Control Board
The central brain of the appliance that controls all components, cycles, and timings.
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 F21 error mean on LG oven?
F21 indicates a malfunction in the heating element, resulting in improper heating.
Can I fix LG oven F21 error myself?
Yes, start by ensuring the oven door is closed and power cycling the unit.
How much does it cost to fix F21 error?
Repair costs vary; expect moderate costs for wiring or sensor, and higher for control board replacements.
When should I call a technician for F21?
Call a technician if the error persists after a power cycle or if wiring appears damaged.
Sources & References
- LG Range – Error Codes List | LG USA Support (official)
- LG Range & Oven Error Codes List | LGParts.com (community)
Data last verified: 2026-07-31
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