LG DLEX3900W clothes take too long to dry
Cause 1 of 4The exhaust duct is blocked, dirty or too long, or the outside wall damper is blocked. Source: Troubleshooting: Operation, p. 52
First checkCheck the exhaust duct for debris, lint and obstructions, and check that the outside wall damper opens and is not blocked, jammed or damaged.
Causes and checks
The exhaust duct is blocked, dirty or too long, or the outside wall damper is blocked. Source: Troubleshooting: Operation, p. 52
- Check the exhaust duct for debris, lint and obstructions, and check that the outside wall damper opens and is not blocked, jammed or damaged.
The lint filter is dirty. Source: Troubleshooting: Operation, p. 52
- Remove the lint before every load and hold the filter up to a light to see whether it is clogged. See Clean the lint filter.
- With loads that make a lot of lint, such as new bath towels, pause the cycle and clean the filter during the cycle.
Light and heavy items were dried together, or the fabrics are large and heavy. Source: Troubleshooting: Operation, p. 52
- Dry heavy items separately from light ones, and split large heavy fabrics into smaller loads of a consistent size.
The load is too big, or too small for Sensor Dry to judge. Source: Troubleshooting: Operation, p. 52
- Divide an extra large load into smaller ones. For a very small load, add a few items for proper tumbling, or use Manual Dry.
All 4 causes checked. Contact LG Customer Information Center: 1-800-243-0000.
Service
If the checks above do not clear it, contact LG Customer Information Center: 1-800-243-0000, lg.com/us/support. United States (Canada: 1-888-542-2623). Source: Limited Warranty: To Obtain Warranty Service, pp. 58, 64
Other DLEX3900W problems
- Dryer does not heat4 causes in the manual. First: A house fuse is blown, a circuit breaker has tripped or the power is out.
- Dryer will not turn on2 causes in the manual. First: the power cord is not plugged in firmly.
- Damp spots after a Sensor Dry cycleThe load is very large, very small, or a single large item such as a blanket or comforter.
- Lint on clothes3 causes in the manual. First: the lint filter is not clean.
- Clothes are wrinkled2 causes in the manual. First: the clothes were overdried.
- Static in clothes after drying3 causes in the manual. First: fabric softener is missing or used incorrectly.
- Steam does not generate and no error code is shownWater level error.
- Unpleasant odor from the dryer2 causes in the manual. First: the dryer is new. The rubber inside gives off an odor.
- Dryer will not connect to Wi-Fi4 causes in the manual. First: the Wi-Fi password was entered incorrectly.
Sources
- Owner's Manual, Dryer DL*X390**. LG Electronics Inc. Document MFL70442672, revision Rev.00, 2024-02-26, 64 pages, en-US. gscs-b2c.lge.com. Listed on the manufacturer's support page. Retrieved 12 November 2026.
- Owner's Manual, Dryer DL*X400** / DL*X408**. LG Electronics Inc. Document MFL70442676, revision Rev.02, 2026-06-25, 60 pages, en-US. gscs-b2c.lge.com. Listed on the manufacturer's support page. Retrieved 12 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.