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Error code reference

LG Microwave Error Code E-11

Sensor open error; the gas sensor is unplugged, wiring is faulty, or the smart board has failed.

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Sensor open error; the gas sensor is unplugged, wiring is faulty, or the smart board has failed.

First step from the service manual

Check unplugged sensor, wiring or smart board. If necessary, replace sensor. If error code appears when starting sensor function, replace smart board.

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

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What E-11 means on a LG microwave

The E-11 error code on an LG microwave indicates a sensor open error specifically related to the gas sensor circuit. This sensor is part of the microwave's smart cooking system, which detects humidity and gases released by food during cooking to automatically adjust cook time and power levels. An "open" condition means the control board is reading a broken or missing circuit where the sensor signal should be present, rather than a normal sensor resistance reading. This can result from the sensor being physically disconnected, a break in the wiring harness, or a failure in the smart board itself.

The gas sensor is typically connected to the smart board via a small wiring harness with a plug-in connector. The most common trigger for E-11 is a loose or disconnected connector at either the sensor or board end, which interrupts the signal path entirely. Wiring faults such as pinched, burned, or corroded wires in the harness can also create an open circuit condition that the board interprets as a missing sensor.

If the error code appears immediately when the sensor cook function is initiated rather than during normal cooking, this behavior points more strongly toward a smart board failure rather than a sensor or wiring issue. The diagnostic sequence begins with inspecting the sensor connection and wiring before condemning the smart board, since sensor and wiring repairs are significantly less costly. If the wiring and connector check out and the sensor itself is confirmed faulty, sensor replacement is the next step. A persistent error after sensor replacement typically requires smart board replacement.

Source: manufacturer service documentation.

Common causes of E-11

  1. 01

    Disconnected sensor connector

    Wiring / connection

    The plug connecting the gas sensor to the smart board may have come loose, which immediately breaks the circuit and triggers the E-11 error. Inspect both ends of the sensor wiring harness for a loose or unseated connector.

  2. 02

    Faulty or broken wiring harness

    Part replacement

    Wires in the harness running between the gas sensor and the smart board can become pinched, burned, or corroded over time, creating an open circuit condition. Visually inspect the harness for any damage and check continuity along the wire runs.

  3. 03

    Failed gas sensor

    Part replacement

    The gas sensor itself can fail internally, causing it to read as an open circuit even when properly connected. If the connector and wiring check out without fault, the sensor should be replaced.

  4. 04

    Smart board failure

    Part replacement

    If E-11 appears immediately when the sensor cook function is started and the sensor and wiring have already been confirmed good, the smart board has likely failed. The board controls sensor signal interpretation and a failed board cannot correctly read even a functioning sensor.

See the test procedure for each cause

Frequently asked questions about E-11

What does E-11 mean on a LG microwave?
E-11 is a sensor open error indicating that the LG microwave's smart board cannot detect a signal from the gas sensor. This means the circuit between the sensor and the board is broken or missing. The cause is typically a disconnected sensor plug, damaged wiring, a failed sensor, or in some cases a faulty smart board.
Can I fix the E-11 error myself?
If the error is caused by a disconnected sensor connector, a knowledgeable DIYer can often reseat the plug after accessing the sensor compartment. Wiring inspection and sensor replacement are also manageable repairs if you are comfortable working inside the appliance with the power disconnected. Smart board replacement is more involved and may be better suited to a qualified technician.
Will resetting the microwave clear the E-11 error?
A reset will not permanently clear E-11 if the underlying cause has not been addressed. The error will return as soon as the sensor cook function is used again because the control board will still detect the open circuit condition. The sensor connection, wiring, and components need to be diagnosed and repaired for the error to go away.
Is it safe to use my LG microwave while E-11 is displayed?
The E-11 error disables the automatic sensor cooking functions, so those modes should not be relied upon while the fault is present. Basic timed cooking may still operate, but using the microwave with a known sensor circuit fault is not recommended as a long-term practice. It is best to diagnose and repair the issue before continuing regular use.
How much does it cost to repair the E-11 error on an LG microwave?
If the fix is simply reseating a disconnected connector, the cost may be minimal or limited to a service call fee. A replacement gas sensor typically falls in the range of $20 to $60 for the part, while a smart board replacement can range from $80 to $200 or more depending on the model, plus labor if a technician performs the repair.

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