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LG DLEX3900W dryer will not turn on

Cause 1 of 2The power cord is not plugged in firmly. Source: Troubleshooting: Operation, p. 51

First checkPlug the cord firmly into a grounded outlet that matches the rating plate.

Causes and checks

The power cord is not plugged in firmly. Source: Troubleshooting: Operation, p. 51
1. Plug the cord firmly into a grounded outlet that matches the rating plate.
A house fuse is blown, a circuit breaker has tripped or the power is out. Source: Troubleshooting: Operation, p. 52
1. Reset the breaker or replace the fuse. Do not increase the fuse capacity.
Licensed electrician If the circuit is overloaded, have a qualified electrician correct it.

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.
Clothes take too long to dry4 causes in the manual. First: the exhaust duct is blocked, dirty or too long, or the outside wall damper is blocked.
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.

Applies to: DLEX3900W (variants DLEX3900B; DLGX3901W; DLGX3901B), DLEX4000W (variants DLEX4000B; DLGX4001W). United States and Canada.
Source: Owner's Manual, Dryer DL*X390**, MFL70442672 revision Rev.00, 2024-02-26; Owner's Manual, Dryer DL*X400** / DL*X408**, MFL70442676 revision Rev.02, 2026-06-25
Last verified: 12 November 2026
Handbook: LG DLEX3900W and DLEX4000W steam dryers in Dryers; all LG handbooks