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Error code reference

LG Dryer Error Code nU

NFC module is wrong/faulty (displayed in test mode only).

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What the nU error code actually means

The nU code means your LG dryer's built-in wireless communication chip, used for smart app features, is not working correctly or may be the wrong part. This code only shows up when a technician runs a special diagnostic test on the dryer, not during everyday use. It does not affect the dryer's ability to dry clothes, but it does mean the smart or app-based features may not work.

Diagnostic procedure

The full nU procedure

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First diagnostic step
Check NFC module; replace if necessary.
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Most common causes of nU

Ranked by how often they cause this code
  1. 1Faulty NFC module
  2. 2Loose or disconnected wiring harness
  3. 3Incompatible or incorrect NFC module installed
  4. 4Corrosion or damage at the module connector

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Questions people ask about nU

What does nU mean on a LG dryer?
The nU code on an LG dryer indicates that the NFC module is faulty or incorrect. This code only appears during the dryer's internal test or service mode, not during regular operation. The NFC module handles smart communication features like app connectivity. The fix typically involves inspecting the module and its wiring, then replacing the module if necessary.
Will resetting my LG dryer clear the nU error code?
A standard power reset is unlikely to permanently clear the nU code if the NFC module is genuinely faulty or incorrectly installed. Because the code is generated during test mode diagnostics, it will reappear each time test mode is run until the underlying hardware issue is resolved. Addressing the module or its wiring connection is required for a lasting fix.
How much does it cost to fix the nU error on an LG dryer?
If only a harness reconnection is needed, the repair may involve little to no parts cost, with any expense coming from a service call fee. If the NFC module needs replacement, parts costs can range from roughly $20 to $80 or more depending on the model, plus any applicable labor charges if a technician performs the repair.
How do I fix the nU error code on my LG dryer?
Start by entering test mode and confirming the code, then inspect the NFC module's wiring harness connector for loose connections, corrosion, or damage. Reseat the connector firmly and rerun the test. If the code persists, the NFC module is likely defective and should be replaced with a compatible unit for your specific dryer model.
Is it safe to use my LG dryer when it shows the nU code?
Yes, the nU code is a test-mode-only diagnostic and does not indicate a problem with the dryer's core heating or mechanical systems. The dryer should continue to operate normally for drying clothes. The code only signals an issue with the smart communication feature, so safety is not a concern for standard use.

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