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Error code reference

LG Range Error Code -SE-

Shorted key error; a keypad has been pressed continuously for 10 minutes.

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Shorted key error; a keypad has been pressed continuously for 10 minutes.

First step from the service manual

Check the membrane wire harness to make sure it is properly connected with the PCB.

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

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What -SE- means on a LG range

The -SE- error code on an LG range stands for a shorted key error. This code triggers when the control detects that a single key on the keypad has been held in a continuously activated state for 10 minutes or longer. The control board interprets this sustained signal as a short circuit condition within the keypad input circuit, and it will disable normal oven operation to prevent unintended commands from being executed. This is a protective function built into the control logic.

The keypad on an LG range is a membrane-type assembly that communicates with the main PCB (printed circuit board) through a ribbon-style wire harness. When a key is physically stuck, debris is lodged beneath the membrane surface, or the harness connection has a fault, the PCB receives a constant low-resistance signal on that key's circuit. This mimics the electrical behavior of a key being pressed without release. The control cannot distinguish between an intentional long press and a shorted circuit, so it flags the condition after the 10-minute threshold.

The first diagnostic step is to inspect the membrane wire harness connection at the PCB. A loose, corroded, or partially seated connector can create a continuous signal on one or more key lines. Beyond the harness, physical damage to the membrane keypad itself, such as a deformed or contaminated overlay, is a frequent root cause. In some cases, moisture intrusion behind the control panel can bridge contacts within the membrane, producing the same shorted-key signal.

Source: manufacturer service documentation.

Common causes of -SE-

  1. 01

    Stuck or physically jammed keypad button

    Wiring / connection

    A key on the membrane keypad can become physically stuck due to food debris, grease buildup, or a deformed membrane overlay. Inspect the keypad surface for any button that appears depressed or does not spring back when pressed.

  2. 02

    Loose or improperly seated membrane wire harness

    Wiring / connection

    The ribbon harness connecting the membrane keypad to the PCB can work loose over time, causing intermittent or constant key signals. Check that the harness connector is fully and squarely seated at the PCB.

  3. 03

    Moisture or liquid intrusion behind the control panel

    Part replacement

    Liquid that seeps behind the control panel can bridge contacts within the membrane assembly, creating a sustained short on a key circuit. Look for signs of moisture, residue, or corrosion on the membrane or harness connector.

  4. 04

    Failed or damaged membrane keypad

    Part replacement

    The membrane keypad itself can develop internal shorts due to wear, heat exposure, or physical damage to the conductive layers. If the harness connection is secure and no debris is present, the membrane assembly likely needs replacement.

  5. 05

    Faulty main PCB

    Part replacement

    In less common cases, the PCB may misinterpret input signals due to a damaged input circuit on the board itself. This is typically suspected only after the harness and membrane keypad have been confirmed good.

See the test procedure for each cause

Frequently asked questions about -SE-

What does -SE- mean on a LG range?
The -SE- error code indicates a shorted key error. It means the control board has detected that one key on the membrane keypad has been continuously activated for 10 minutes or more. The oven disables normal operation until the shorted or stuck key condition is resolved. This can stem from a physically stuck button, a harness connection fault, or a damaged keypad.
Can I fix the -SE- error myself without calling a technician?
In many cases, yes. Start by disconnecting power to the range for several minutes and then inspecting the control panel keypad for any stuck or debris-covered button. Also check that the membrane wire harness is fully connected to the PCB. If cleaning the keypad surface and reseating the harness resolves the issue, no parts or professional service are needed.
Will resetting the range clear the -SE- error?
A power reset by unplugging the range or shutting off the circuit breaker for a few minutes may temporarily clear the -SE- code. However, if the underlying cause, such as a stuck key, faulty harness connection, or damaged membrane, is not corrected, the error will return within 10 minutes of resumed operation. A reset alone is not a repair.
Is it safe to use my LG range when it shows the -SE- error?
The -SE- error disables the control panel inputs as a protective measure, which means the range may not respond to commands normally. You should not attempt to operate the oven while this error is active, as the control logic is compromised. Disconnect power to the appliance until the issue is diagnosed and corrected.
How much does it cost to repair the -SE- error on a LG range?
Repair costs vary depending on the root cause. If only cleaning or reseating the harness is needed, there may be no parts cost involved. Replacing the membrane keypad assembly typically runs between $50 and $150 for the part, while a replacement PCB can range from $100 to $300 or more. Adding professional labor costs, total repair estimates generally fall between $100 and $400 depending on the components required.

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