LG Oven Error Code F21 — Upper Oven Convection Fan Error
What this means
Error F21 indicates the convection fan in the upper oven is malfunctioning. The fan circulates hot air for even cooking in convection mode. A failed motor, blocked fan blade, or wiring issue can prevent the fan from running.
Step-by-step fix
4 stepsListen for the fan
Start a convection bake cycle and listen for the fan running at the back of the oven.
Check for obstructions
With the oven off and cool, check the convection fan (visible through the back panel inside the oven) for obstructions.
Test the fan motor
Access the fan motor from behind the oven and test for continuity with a multimeter.
Replace the fan motor
If the motor has no continuity, replace it.
When to call a professional
Accessing the convection fan motor requires removing the oven back panel. Professional service recommended.
Information compiled from manufacturer service manuals, official troubleshooting documentation, and appliance repair industry resources. This guide is for informational purposes only — always consult a qualified technician for complex repairs.
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