LG Range Error Code F20

F20 on an LG range means the lower oven door lock has failed to confirm a locked position after the lock motor ran two cycles. This is typically triggered during a self-clean cycle when the control board commands the door to lock but receives no confirmation from the door lock switch. The issue can involve the lock motor, the lock switch, the latch mechanism, or the wiring connecting them.

Normal baking and broiling functions may still be available while F20 is active, but you should not attempt another self-clean cycle until the fault is repaired. If the door is stuck in a locked position, do not force it open, as this can damage the latch assembly and door hinge components. Address the fault before using the self-clean feature again.

Repair costs vary depending on which component has failed. A door lock switch or lock motor typically costs between $30 and $90 for the part alone. If you hire a technician, expect to pay between $150 and $300 or more including labor, depending on your location and the extent of the diagnosis required. Wiring harness repairs or control board replacement can push costs higher.

You can attempt a reset by pressing the Lower Clear/Off button for 3 seconds, which is also the first recommended diagnostic step. This may release the door if it is physically locked and allow you to inspect the latch area. However, simply clearing the code without addressing the underlying cause will result in F20 returning the next time a self-clean cycle is attempted.

Start by pressing and holding the Lower Clear/Off button for 3 seconds to test the lock motor response and release the door if needed. Then inspect the latch mechanism for obstructions, grease buildup, or physical damage. If the latch area is clear, the next steps are testing the door lock switch for proper operation and checking the wiring harness for heat damage or disconnected connectors. If the motor or switch is defective, those components will need to be replaced.