LG · Laundry · WM4000HBA · Owner's Manual
The Control Lock feature is turned on. Turn on the washer, then press and hold the Control Lock button, or the button labeled Control Lock on or under it, for 3 seconds to turn it off.
Source: LG WM4000HBA Owner's Manual, extracted page 43
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LG ThinQ App and Smart Features
The LG ThinQ app lets you communicate with the washer from a smartphone. It is used for remote control, cycle downloads, monitoring, alerts, settings, and Smart Diagnosis.
What the LG ThinQ app can do
LG WM4000HBA Owner's Manual, extracted pages 33-36Troubleshooting Overview
Your washer has an automatic error-monitoring system that detects and helps diagnose problems early. If the washer does not work properly or does not work at all, check the items below before calling for service.
For more detailed information or videos, LG directs you to the troubleshooting page at www.lg.com.
LG WM4000HBA Owner's Manual, extracted page 43This answer is only published when it has a reviewed answer status and a source citation back to the manual text.