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Error code reference

LG Microwave Error Code E-01

Sensor error during sensor cook or temperature process, typically caused by incorrect sensor resistance…

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Sensor error during sensor cook or temperature process, typically caused by incorrect sensor resistance, loose shield wire connector, or dirt on sensor filter.

First step from the service manual

Check shield wire connector for looseness and verify correct resistance per page 5-11; check sensor filter for dirt.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
  • Verified part numbers when replacement is required
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What E-01 means on a LG microwave

The E-01 error code on an LG microwave indicates a fault detected within the humidity or temperature sensor circuit during a sensor cook or sensor-based cooking process. This sensor is responsible for measuring moisture levels or temperature emitted from food during cooking, allowing the microwave to automatically adjust cook time and power. When the control board receives a signal from the sensor that falls outside the expected resistance range, it triggers the E-01 code and halts or interrupts the cooking cycle to prevent incorrect results.

The most common root causes involve the sensor's electrical connection or its resistance value. The sensor communicates with the control board via a shielded wire, and a loose or partially disconnected shield wire connector is a frequent culprit. Incorrect resistance at the sensor itself, meaning the sensor is reading outside the specification listed in the technical data, also triggers this fault. A contaminated sensor filter, which can accumulate grease or food particles over time, can block proper moisture detection and cause erroneous readings that the board interprets as a sensor error.

Diagnosing E-01 starts with a physical inspection of the shield wire connector to confirm it is fully seated and free of corrosion or damage. The technician should then measure the sensor's resistance and compare it against the specified values. The sensor filter should also be inspected and cleaned if debris is present. If resistance values are out of range and the connector and filter check out, the sensor itself is likely faulty and will require replacement.

Source: manufacturer service documentation.

Common causes of E-01

  1. 01

    Loose shield wire connector

    Wiring / connection

    The shielded wire connecting the humidity or temperature sensor to the control board can work loose over time due to vibration. Inspect the connector for a secure, fully seated connection and check for any signs of corrosion or bent pins.

  2. 02

    Dirty or clogged sensor filter

    Wiring / connection

    Grease, food particles, and steam residue can accumulate on the sensor filter, blocking it and causing inaccurate readings. Visually inspect the filter and clean it carefully if contamination is present.

  3. 03

    Faulty or out-of-range sensor resistance

    Part replacement

    The sensor must output resistance within a specific range for the control board to function correctly. If resistance measurements do not match the specified values, the sensor has likely degraded and needs replacement.

  4. 04

    Damaged shield wire

    Part replacement

    Physical damage to the shield wire itself, such as a pinched, frayed, or broken conductor, can cause incorrect or absent signals from the sensor. Inspect the full length of the wire for visible damage.

  5. 05

    Control board fault

    Part replacement

    If the sensor, its wiring, and the filter all test correctly, the control board may be misinterpreting the sensor signal due to an internal failure. This is the least common cause and is typically diagnosed only after all other components are ruled out.

See the test procedure for each cause

Frequently asked questions about E-01

What does E-01 mean on a LG microwave?
E-01 on an LG microwave indicates a sensor error that occurs during a sensor cook or temperature-based cooking process. The control board has detected that the sensor's resistance is incorrect or that it is not receiving a valid signal from the sensor circuit. Common causes include a loose shield wire connector, a dirty sensor filter, or a failed sensor. The error prevents the microwave from completing automatic sensor cooking cycles.
Can I fix the E-01 error on my LG microwave myself?
Some causes of E-01 are DIY-friendly. Cleaning the sensor filter and reseating the shield wire connector are straightforward tasks that require no special tools. However, measuring sensor resistance requires a multimeter and comfort with reading technical specifications. Replacing the sensor or control board involves working inside the microwave cabinet, which should only be done after unplugging the unit and allowing the capacitor to discharge.
Is it safe to use my LG microwave when it shows E-01?
When E-01 is active, the sensor cooking functions are unreliable or non-operational, meaning automatic cooking adjustments will not work correctly. Basic timed cooking may still function depending on how the error presents, but sensor-based modes should not be trusted until the fault is resolved. It is best to address the error before relying on the appliance for regular use.
Will resetting my LG microwave clear the E-01 error?
Unplugging the microwave for a few minutes and restoring power may temporarily clear the E-01 code, but the error will return if the underlying problem is not fixed. A loose connector, dirty filter, or failed sensor will continue to generate the fault during sensor cooking cycles. A reset is useful for confirming whether the issue is intermittent, but it is not a repair.
How much does it cost to repair an LG microwave E-01 error?
Repair costs depend on which component is at fault. Cleaning the sensor filter costs nothing beyond your time. A replacement humidity or temperature sensor typically ranges from $20 to $60 for the part alone. If a control board replacement is needed, parts can range from $80 to $200 or more. Adding professional labor generally brings total repair costs to between $100 and $300 depending on the specific failure and your location.

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