LG · Laundry · DLEX4000B · Owner's Manual
The Control Lock feature is turned on. Turn the dryer on and press and hold the button that has Control Lock on or under it for 3 seconds to turn it off.
Source: LG DLEX4000B Owner's Manual, extracted page 49
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Selectable options and cycle features
Your dryer includes cycle modifiers and extra options that let you adjust drying for different fabrics, load sizes, and convenience needs. Not every option works with every cycle. If you press a button for an option that is not allowed for the selected cycle, the dryer chimes twice and the setting does not change.
Before you use options
LG DLEX4000B Owner's Manual, extracted pages 39-42Frequently Asked Questions
Why does my dryer beep when I press a button and then nothing happens? If the dryer beeps but does not start, the Control Lock feature is turned on. To turn Control Lock off, turn the dryer on and then press and hold the button that has Control Lock on or under it for 3 seconds.
Why does my dryer take so long to dry clothes? Drying time depends on airflow. Proper airflow is critical for efficient dryer operation. If the lint filter is full of lint or clogged with fabric softener sheet residue, airflow can be reduced and the time needed to dry clothes can increase a lot. The manual also says to see the troubleshooting charts for more tips.
LG DLEX4000B Owner's Manual, extracted page 49This answer is only published when it has a reviewed answer status and a source citation back to the manual text.