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Error code reference

LG Washer Error Code E-42

Easy/PH sensor short error.

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What the E-42 error code actually means

Your LG washer is showing an error because the sensor that monitors water or detergent conditions is sending a faulty signal, specifically a short circuit in that sensor's wiring or the sensor itself. The washer stops the cycle because it cannot get reliable information from that sensor. This problem typically requires inspecting or replacing the sensor or its wiring.

Diagnostic procedure

The full E-42 procedure

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1
First diagnostic step
Check if both terminals of the sensor are slightly shorted.
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Most common causes of E-42

Ranked by how often they cause this code
  1. 1Faulty Easy/PH sensor with internal short
  2. 2Damaged or pinched wiring harness
  3. 3Corroded or moisture-contaminated connector
  4. 4Loose or improperly seated connector
  5. 5Faulty control board misreading the sensor circuit

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Questions people ask about E-42

What does E-42 mean on a LG washer?
The E-42 code on an LG washer indicates an Easy/PH sensor short error. This means the control board has detected that the terminals of the pH or Easy sensor circuit are shorted together, preventing the sensor from providing reliable data. The washer stops the cycle until the fault is resolved.
Is it safe to keep using my LG washer when it shows the E-42 error?
It is not recommended to continue running the washer while the E-42 error is active. The error indicates a sensor circuit fault that the washer cannot ignore, and in most cases the machine will halt the cycle on its own. Continuing to force cycles could risk incomplete or improperly managed wash performance.
Will resetting my LG washer clear the E-42 error code?
A reset may temporarily clear the E-42 code, but it will return if the underlying short circuit in the sensor or wiring is not corrected. To properly resolve the error, the sensor terminals should be checked for a short, the wiring harness inspected, and any faulty components repaired or replaced before assuming the issue is resolved.
Can I fix the E-42 error myself on my LG washer?
Some cases of the E-42 error are DIY-friendly, such as reseating a loose connector or cleaning a corroded terminal. However, if the sensor itself has an internal short or the wiring harness is damaged, replacement parts will be needed. Using a multimeter to test resistance across the sensor terminals is the key first step before ordering any parts.
How much does it cost to repair the E-42 error on a LG washer?
Repair costs depend on the root cause. If only cleaning a connector resolves the issue, there may be no parts cost involved. A replacement Easy/PH sensor typically costs in the range of $20 to $60 in parts. If the control board is at fault, board replacement can range from $100 to $300 or more for parts alone, with additional labor costs if a technician is hired.

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