Lg dryer not heating
Cause 1 of 4A house fuse is blown, a circuit breaker has tripped or the power is out. Source: Troubleshooting: Operation, p. 52
First checkReset the breaker or replace the fuse. Do not increase the fuse capacity.
Causes and checks
A house fuse is blown, a circuit breaker has tripped or the power is out. Source: Troubleshooting: Operation, p. 52
- 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.The gas supply or service is turned off on a gas model. The dryer runs without heat and shows no error code. Source: Troubleshooting: Operation, p. 52
- Check that the hose gas shutoff and the shutoff valves on the dryer are both fully open.
- Check that other gas appliances in the home work normally.
The gas supply or service is turned off on a gas model. The dryer runs without heat and shows no error code. Source: Troubleshooting: Operation, p. 51
- Check that the hose gas shutoff and the shutoff valves on the dryer are both fully open.
- Check that other gas appliances in the home work normally.
The Energy Saver option is selected on the Normal cycle. It adds an air dry section at the start, so no heat is felt at first. Source: Troubleshooting: Operation, p. 52
- To run the Normal cycle with heat from the start, turn Energy Saver off.
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 will not turn on2 causes in the manual. First: the power cord is not plugged in firmly.
- 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.