How do I run diagnostics on my LG washer?

Running an automated diagnostic test on an LG front-load or top-load washing machine to check internal component health involves executing a specific button-pressing and power sequence. First, ensure the washing machine drum is completely empty of laundry and the power is turned off. Second, press the "Power" button while simultaneously pressing and holding the "Spin Speed" and "Soil Level" buttons down together until the digital display illuminates a series of test numbers or all indicator lights flash. Third, repeatedly press the "Start/Pause" button to step through automated component tests, which will test the water inlet valves, drum rotation, and drain pump. You can troubleshoot control responses easily. You can verify that your diagnostic run is successful when watching the console cycle through tests confirms that all internal motors and valves are operating correctly.