LG Range Error Code F-18

The F-18 code on an LG range means the meat probe thermistor has been detected in a shorted state for more than one minute during active cooking. The control board monitors the resistance of the probe sensor continuously, and a near-zero resistance reading that persists triggers this fault. It points to a problem with the probe itself, the probe jack, or the wiring connected to it.

You should not attempt to continue cooking with the meat probe connected while this code is active, as the control board cannot accurately monitor probe temperature. However, if you remove the meat probe entirely, standard bake and broil functions that do not rely on the probe may still operate normally. Confirm the error clears after removing the probe before using the oven.

If only the meat probe needs replacement, the cost is typically in the range of $20 to $60 for the part, making it one of the more affordable oven repairs. If the probe jack or wiring harness is damaged, parts and labor can bring the total to somewhere between $100 and $250 depending on the extent of the repair. A failed control board is the most expensive scenario, with costs potentially ranging from $200 to $400 or more including labor.

In many cases, yes. Start by unplugging the meat probe from the oven jack and inspecting both the probe cable and the connector for visible damage, corrosion, or debris. If the probe appears damaged, replacing it is a straightforward repair that does not require disassembling the oven. If the jack or internal wiring is the source of the short, a technician may be needed to safely access and repair those components.

Resetting the range by cycling the power may temporarily clear the display, but the code will return if the underlying short in the probe circuit is still present once cooking begins again. A lasting fix requires identifying and correcting the cause, whether that means replacing the probe, cleaning the jack, or repairing damaged wiring.