LG · Laundry · WM4000HBA · Owner's Manual
An IE error message may blink when the water pressure is low or an inlet filter is clogged with dirt. Clean the inlet filter.
Source: LG WM4000HBA Owner's Manual, extracted pages 40-41
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Clean the drain pump filter
The washer can fail to drain if the drain pump filter becomes clogged. LG recommends cleaning the drain filter periodically to help prevent clogging from foreign objects.
Before you start - Turn off the washer and unplug the power cord. - Be careful: if there is water in the drum, opening the drain filter can cause water to overflow. - Use a bucket if the drum is not completely drained before you open the drain filter. - Do not use the washer without the drain filter, and do not use it with the drain filter assembled incorrectly. This can cause leaks or malfunction.
LG WM4000HBA Owner's Manual, extracted pages 40-41Troubleshooting 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.