LG Dryer Not Drying Clothes: Causes and How to Fix It
Updated · from manufacturer service documentation
If an LG dryer runs a full cycle but clothes come out damp, the leading causes are a restricted vent (see the d80/d90 duct-blockage codes) or a moisture sensor reading outside its normal range. The diagnostic test mode reports the moisture sensor's exact reading, which is the fastest way to tell whether the sensor itself is the problem.
What Causes an LG Dryer Not to Dry Clothes
| Cause | Likelihood | DIY difficulty | Related part |
|---|---|---|---|
| Restricted vent (duct blockage — see d80/d90) | Most common | Easy — clean vent | Vent duct |
| Moisture sensor reading abnormal (too low or too high) | Less common | Moderate — diagnostic test mode | Moisture sensor |
How to Fix an LG Dryer That Isn't Drying, Step by Step
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Check the vent and duct run first
As with LG's d80/d90 duct-blockage codes, restricted airflow is the most common reason a dryer under-performs on drying — clean the lint screen and check the full vent path before suspecting the sensor.
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Check the moisture sensor reading in diagnostic mode
The test mode reports a live value when the moisture sensor is contacted with a damp cloth: under normal circumstances the display should read below 180. A reading of 255 indicates low moisture detection, and 30 indicates high moisture detection — either extreme means the sensor isn't reading dampness correctly.
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If the sensor reading is abnormal, the sensor itself may need replacing
This is a job for a technician if you're not comfortable working with the diagnostic test mode and drum-mounted sensor contacts.
Which Models This Applies To
Documented for the LG DLEX3570 and DLEX4270 dryer service manuals — both share the same diagnostic test mode and moisture sensor reading thresholds. Electric and gas variants of this platform (see the electric-vs-gas breakdown on the LG dryer not-heating page) both use the same moisture sensor design.
See also: LG d80, d90, LG dryer not heating, Dryer not drying (cross-brand).
Frequently Asked Questions
How do I know if my LG dryer's moisture sensor is working correctly?
In diagnostic test mode, touch the sensor with a damp cloth — a normal reading is below 180. Readings around 255 (low moisture) or 30 (high moisture) indicate the sensor isn't detecting dampness properly.
Is a vent problem or a sensor problem more likely?
Vent restriction is the more common cause across LG dryers generally — check the vent and lint screen first before testing the moisture sensor.
Can I check the moisture sensor reading myself?
Yes — the diagnostic test mode reports a live reading when the sensor is touched with a damp cloth, so you can confirm whether it's within the normal range without special tools.
Based on the LG service documentation for the DLEX3570 and DLEX4270 dryer series. Last updated: .