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Error code reference

LG Microwave Error Code E-35

Weight sensor error

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Weight sensor error: initial value of K calculated by weight sensor is above or under ±28 as value of HEX.

First step from the service manual

Check sensor.

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

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What E-35 means on a LG microwave

The E-35 error code on an LG microwave indicates a weight sensor calibration fault. Specifically, the microwave's control board has calculated an initial K value from the weight sensor that falls outside the acceptable calibration window of plus or minus 28 in hexadecimal (HEX). The K value is a calibration constant used by the sensor system to establish a baseline reference for weight-based cooking functions. When this baseline falls outside the permitted range, the control board flags the error and disables the affected functionality.

The weight sensor in LG microwaves is used to support auto-cook and sensor-cook programs that weigh food items to determine cooking parameters. The sensor must initialize within a precise calibration range each time the unit powers up. If the sensor's output signal is too high or too low relative to the expected zero-point reference, the calculated K value will deviate beyond the hex 28 threshold in either direction, triggering E-35.

Common causes include a faulty or drifted weight sensor that is no longer producing accurate output, wiring issues between the sensor and the control board such as loose connectors or damaged harness leads, and physical interference such as debris or a stuck platter mechanism that prevents the sensor from reading a true zero-load baseline. In some cases, the control board itself may be unable to correctly process the sensor signal, though the sensor and its wiring should be inspected first before condemning the board.

Source: manufacturer service documentation.

Common causes of E-35

  1. 01

    Faulty or drifted weight sensor

    Part replacement

    The weight sensor itself may have failed or drifted out of its calibration range, producing an initial K value that exceeds the plus or minus 28 HEX limit. This is the most common cause and is confirmed by checking the sensor's output signal against specification.

  2. 02

    Loose or damaged sensor wiring harness

    Wiring / connection

    A loose connector or damaged wire between the weight sensor and the control board can cause an erratic or out-of-range signal during initialization. Inspect all connector pins and harness routing for signs of corrosion, breaks, or poor seating.

  3. 03

    Physical interference with the sensor or turntable

    Wiring / connection

    Debris, food residue, or a stuck turntable support can place a mechanical load on the weight sensor during startup, shifting the zero-baseline reading outside the acceptable range. Clean the turntable area and ensure the platter rotates and seats freely.

  4. 04

    Failed control board

    Part replacement

    If the sensor and all wiring check out correctly, the control board may be failing to accurately read or process the sensor signal. This would cause the K value calculation to return an out-of-range result even with a known-good sensor.

See the test procedure for each cause

Frequently asked questions about E-35

What does E-35 mean on a LG microwave?
E-35 indicates a weight sensor error where the initial calibration value (called the K value) calculated by the weight sensor is outside the acceptable range of plus or minus 28 in hexadecimal. This means the sensor is not initializing correctly to its baseline zero reference. The error prevents the microwave from using weight-based automatic cooking functions until the issue is resolved.
Can I fix the E-35 error myself?
Some basic checks are possible without professional help, such as cleaning the turntable area, reseating the turntable, and looking for any visible wiring issues. However, actually testing the weight sensor's output signal and replacing components requires technical knowledge and appropriate tools. If the basic checks do not clear the error, a qualified technician should inspect the sensor and wiring harness.
Is it safe to use my LG microwave while E-35 is displayed?
The E-35 error specifically affects the weight sensor system used for automatic and sensor-based cooking programs. Basic microwave functions may still operate, but any cooking mode that relies on the weight sensor will not work correctly. It is best to avoid using automatic weight-based programs until the fault is diagnosed and repaired to prevent improper cooking results.
Will resetting the microwave clear the E-35 error?
A power reset by unplugging the microwave for a few minutes may temporarily clear the error if it was caused by a one-time signal anomaly during startup. However, if the underlying cause is a faulty weight sensor, damaged wiring, or physical interference, the E-35 code will return when the appliance initializes again. A reset is worth trying first, but persistent errors require diagnosis of the sensor and its circuit.
How much does it cost to repair an E-35 error on a LG microwave?
Repair costs vary depending on the root cause. If only wiring or connector issues are found, labor costs alone may range from roughly 75 to 150 dollars. Replacing a faulty weight sensor typically adds a parts cost on top of labor, bringing the total to approximately 100 to 250 dollars or more depending on the specific model and local labor rates. If the control board needs replacement, costs can be higher.

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