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Error code reference

LG Microwave Error Code E-41

Easy/PH Sensor Open Error

LG codesLG microwave codes

Easy/PH Sensor Open Error - sensor not sensed/disconnected.

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-41 means on a LG microwave

The E-41 error code on an LG microwave indicates an Easy Sensor or PH Sensor Open Error. This fault is triggered when the control board cannot detect a signal from the humidity or pressure sensor used in automatic cooking functions. The sensor in question monitors steam or humidity levels released from food during cooking, allowing the microwave to automatically adjust cooking time and power level. When the control board reads an open circuit condition from this sensor, meaning it receives no signal at all, it halts operation and displays E-41.

The most direct cause of this error is a disconnected, damaged, or failed sensor. The sensor may have become unplugged from its connector on the control board or wiring harness, which is a common result of vibration over time or a previous repair attempt where the connector was not fully reseated. Physical damage to the sensor itself, such as a cracked housing or burned contacts, can also create an open circuit condition.

Diagnosing this fault begins with a physical inspection of the sensor and its wiring. Check that the sensor connector is fully seated and that the wiring harness shows no signs of pinching, burning, or breaks. If the connections are intact, the sensor element itself should be tested for continuity. A completely open reading with no continuity confirms sensor failure. Replacement of the sensor is the typical resolution when wiring and connectors check out.

Source: manufacturer service documentation.

Common causes of E-41

  1. 01

    Disconnected sensor connector

    Wiring / connection

    The wiring connector linking the humidity or PH sensor to the control board may have come loose. Inspect the connector at both the sensor and harness ends to confirm it is fully seated.

  2. 02

    Failed or open-circuit sensor

    Part replacement

    The sensor element itself may have failed internally, producing an open circuit that the control board interprets as no sensor present. Testing for continuity across the sensor terminals will confirm this fault.

  3. 03

    Damaged wiring harness

    Part replacement

    The wire harness running from the sensor to the control board may be pinched, broken, or burned. Visually trace the harness for any visible damage and test for continuity along the wiring.

  4. 04

    Corroded or dirty sensor contacts

    Wiring / connection

    Moisture or grease buildup on the sensor connector pins can cause high resistance or an open circuit condition. Cleaning the contacts carefully and reseating the connector may restore proper operation.

  5. 05

    Faulty control board

    Part replacement

    If the sensor, connector, and wiring all test correctly, the control board may be failing to read the sensor signal due to a defect on the board itself. This is the least common cause and is typically diagnosed after all other components are confirmed good.

See the test procedure for each cause

Frequently asked questions about E-41

What does E-41 mean on a LG microwave?
E-41 on an LG microwave indicates an Easy Sensor or PH Sensor Open Error. This means the control board is unable to detect any signal from the humidity or steam sensor used during automatic cooking cycles. The error points to a disconnected connector, damaged wiring, or a failed sensor. The microwave will not function normally until the fault is corrected.
Can I fix the E-41 error on my LG microwave myself?
In some cases, yes. If the sensor connector simply came loose, reseating it will clear the fault without any parts replacement. However, if the sensor itself has failed or the wiring is damaged, replacement parts will be needed. Keep in mind that working inside a microwave involves capacitors that can hold a dangerous charge even when unplugged, so technicians or experienced DIYers should perform internal repairs.
Is it safe to use my LG microwave while the E-41 code is showing?
It is not recommended to continue using the microwave while E-41 is active. The automatic cooking sensor functions will not operate correctly without a working sensor, and the control board has flagged a fault condition. Continued use could produce inconsistent cooking results or mask a wiring issue that may worsen over time.
Will resetting my LG microwave clear the E-41 error?
A basic reset, such as unplugging the unit for a few minutes and restoring power, may temporarily clear the display, but E-41 will return if the underlying sensor fault has not been corrected. The error code will continue to appear until the disconnected or failed sensor is repaired or replaced.
How much does it cost to repair an E-41 error on an LG microwave?
If only the sensor connector needs to be reseated, the repair may cost nothing beyond the time spent. If the humidity or PH sensor requires replacement, parts typically range from $15 to $60 depending on the specific model. If a professional technician is needed for diagnosis and repair, total service costs including labor generally fall in the range of $80 to $200.

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