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Error code reference

LG Range Error Code F

Function error code displayed on oven control, indicating a fault condition requiring service.

LG codesLG range codes

Function error code displayed on oven control, indicating a fault condition requiring service.

First step from the service manual

Press the UPPER CLEAR/OFF or LOWER CLEAR/OFF key and wait for one hour; check the main gas shut-off valve or the oven gas shut-off valve; if error repeats after removing power for five minutes and reconnecting, call for service.

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

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What F means on a LG range

The F error code on an LG range indicates a general function fault condition detected by the oven control board. This code signals that the control system has encountered an abnormal operating state that falls outside expected parameters. Because the F code is a broad fault indicator, it can be triggered by multiple underlying issues, including problems with the gas supply, a temporary control board glitch, or a more persistent component failure requiring hands-on diagnosis.

The oven control board continuously monitors the range's operating conditions. When it detects a fault it cannot self-resolve, it displays the F code and halts normal operation to prevent further issues. In gas ranges, the control board also monitors the gas valve circuit, so a disruption in gas supply or an issue with the oven gas shut-off valve can trigger this condition. The initial diagnostic sequence involves clearing the error through the UPPER CLEAR/OFF or LOWER CLEAR/OFF key, verifying gas supply, and allowing a one-hour cooldown period to rule out a heat-related temporary fault.

If the F code returns after pressing the clear key and waiting, or after disconnecting power for five minutes and restoring it, the fault is persistent and likely tied to a hardware failure rather than a temporary software state. At that point, the control board itself, the gas valve, or associated wiring connections become the primary suspects. Persistent F codes that survive both a soft reset and a full power cycle require a qualified service technician to perform hands-on component testing.

Source: manufacturer service documentation.

Common causes of F

  1. 01

    Temporary control board glitch

    Wiring / connection

    The oven control board can occasionally enter a fault state due to a power fluctuation or software error. Pressing CLEAR/OFF and waiting one hour, or cycling power at the breaker for five minutes, often resolves this without any parts replacement.

  2. 02

    Gas supply interruption

    Wiring / connection

    A closed or partially closed main gas shut-off valve or oven gas shut-off valve can trigger the F code. Verify both valves are fully open and that gas is available to other appliances in the home.

  3. 03

    Faulty oven control board

    Part replacement

    If the F code persists after a soft reset and a full power cycle, the control board itself may have a hardware failure preventing normal operation. This typically requires board replacement by a qualified technician.

  4. 04

    Gas valve component failure

    Part replacement

    An internal failure in the oven gas valve can cause the control board to detect a fault condition and display the F code. This requires professional diagnosis and, if confirmed, valve replacement.

  5. 05

    Loose or damaged wiring connections

    Wiring / connection

    Wiring harness connections between the control board and other components can loosen over time or sustain heat damage, causing intermittent or persistent fault codes. A technician will inspect and reseat or replace affected connections.

See the test procedure for each cause

Frequently asked questions about F

What does F mean on a LG range?
The F code on an LG range is a general function fault code displayed by the oven control system when it detects an abnormal condition it cannot resolve on its own. It can be caused by a temporary control board glitch, a gas supply issue, or a hardware failure in the control board or gas valve. The code stops normal oven operation to signal that service is needed. Checking the gas valves and performing a reset are the recommended first steps.
Can I fix the F error code on my LG range myself?
You can attempt the basic reset steps yourself: press the UPPER CLEAR/OFF or LOWER CLEAR/OFF key, wait one hour, and verify that both the main gas shut-off valve and the oven gas shut-off valve are fully open. If the code clears and does not return, no further action is needed. However, if the F code comes back after removing power for five minutes and reconnecting, a qualified technician should inspect and service the range.
Is it safe to use my LG range while the F error code is displayed?
You should not attempt to use the oven while the F code is active, as the control system has detected a fault and normal operation has been interrupted. Using the range in this condition could be unsafe, particularly if the issue involves the gas valve or control board. Clear the code first and confirm normal operation before resuming cooking.
Will resetting the LG range clear the F error code?
A reset will clear the F code if it was caused by a temporary glitch. Press the CLEAR/OFF key and wait one hour, or disconnect power at the circuit breaker for five minutes then reconnect. If the fault was temporary, the code should not return. If the F code reappears after the reset, there is an underlying hardware issue that requires professional service.
How much does it cost to repair an F error code on an LG range?
Repair costs depend on the root cause. If the issue is a gas valve problem, parts and labor can range from around $150 to $400 depending on the valve type and local labor rates. A control board replacement typically costs between $200 and $500 or more, including parts and labor. If the fault is caused by a wiring or connection issue, costs are generally on the lower end of the service call range.

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