What does the error code F09 E01 mean and how do I fix it?

The F09 E01 code indicates a drain pump system error, often caused by incorrect drain hose installation or a blockage. Check that the drain hose is not kinked, pinched, or blocked, and ensure the drain hose does not extend into the standpipe farther than 4.5 inches (114 mm). Also verify the end of the drain hose is not higher than 96 inches (2.4 m) above the floor. (Page 17)