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Error code reference

LG Range Error Code FC

Door latch error

LG codesLG range codes

Door latch error - unlock home and lock home are true simultaneously.

First step from the service manual

Check latch switches 1 and 2 for proper operation. Verify door latch assembly cam position and switch continuity.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What FC means on a LG range

The FC error code on an LG range indicates a door latch logic conflict during a self-clean cycle. Specifically, the control board is receiving simultaneous signals that the latch is in both the unlocked home position and the locked home position at the same time. This is a contradictory state that the control interprets as a fault, because the latch mechanism can only physically occupy one position at a time. The two latch switches, referred to as latch switch 1 and latch switch 2, are responsible for reporting the cam position of the door latch assembly to the control board.

The door latch assembly uses a motorized cam to drive the latch bolt into the locked or unlocked position. Each switch closes or opens at a specific point in the cam's rotation to signal the correct position to the board. When both switches report opposing states simultaneously, the most likely explanation is that one or both switches have failed internally, are misaligned relative to the cam, or have developed a short or open circuit in their wiring harness. A damaged cam that stops in an intermediate position can also cause both switches to read in an unexpected state.

Diagnosing this fault begins with checking latch switches 1 and 2 for proper continuity at their expected cam positions. The cam should be inspected for physical damage or obstruction that prevents full travel to either the locked or unlocked home position. Wiring between the switches and the control board should also be checked for shorts, broken conductors, or loose connector terminals that could produce false signals.

Source: manufacturer service documentation.

Common causes of FC

  1. 01

    Failed door latch switch

    Part replacement

    One or both of the latch switches has failed internally, causing it to send an incorrect signal regardless of cam position. Test each switch for continuity at the locked and unlocked cam positions to identify which one is at fault.

  2. 02

    Latch cam stopped in intermediate position

    Wiring / connection

    The latch motor cam may have stalled or stopped partway through its travel, placing both switches in an ambiguous state. Inspect the cam for physical obstructions, binding, or damage preventing full rotation to either home position.

  3. 03

    Wiring harness fault at latch switches

    Wiring / connection

    Damaged, shorted, or loose wiring between the latch switches and the control board can cause false signals that mimic simultaneous switch closure. Inspect the connector terminals and wire insulation in the latch assembly circuit for visible damage or looseness.

  4. 04

    Latch motor failure

    Part replacement

    If the latch motor has failed or is weak, it may not drive the cam fully to the locked or unlocked home position, leaving the switches in a conflicting state. A motor that hums but does not complete travel is a strong indicator of this fault.

  5. 05

    Control board fault

    Part replacement

    In rare cases, the main control board may misinterpret the switch signals due to a board-level failure. This should only be suspected after the latch switches, cam, motor, and wiring have all been confirmed to be functioning correctly.

See the test procedure for each cause

Frequently asked questions about FC

What does FC mean on a LG range?
The FC code on an LG range indicates a door latch error in which the control board is simultaneously receiving both the unlocked home and locked home signals from the door latch switches. This contradictory input triggers the fault. It most commonly occurs during or after a self-clean cycle when the latch mechanism fails to complete its travel to either position.
Will resetting the range clear the FC error code?
A power reset by unplugging the range or switching off the circuit breaker for a few minutes may temporarily clear the FC code, but it will likely return if the underlying latch issue is not resolved. The latch switches, cam position, and wiring should be inspected before attempting another self-clean cycle. Continuing to reset without repair risks repeated faults or a door that will not release.
Is it safe to use my LG range while the FC code is displayed?
Basic cooktop burner operation may still be possible depending on the control board's response to the fault, but the self-clean function should not be attempted while this code is active. The FC error specifically involves the door latch, which is a safety-critical component during high-temperature cleaning cycles. It is best to address the fault before relying on the oven for baking or roasting as well.
How do I fix the FC error on my LG range?
Start by inspecting the door latch assembly, including the cam position and the condition of latch switches 1 and 2. Test each switch for proper continuity at the locked and unlocked positions. Check the wiring harness connected to the switches for any shorts, broken wires, or loose terminals. If a switch, the latch motor, or the cam is found to be defective, replacement of that component is required to resolve the fault.
How much does it cost to repair an FC error on an LG range?
Repair costs vary depending on which component has failed. Latch switch replacements are generally the least expensive fix, with parts typically ranging from around $15 to $50 and professional labor adding $75 to $150 or more. A full latch assembly or motor replacement will cost more, potentially ranging from $80 to $200 for parts alone. Control board replacement is the most expensive possibility, with parts ranging from $150 to $350 or higher depending on the model.

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