What does the F20 error code mean and how do I fix it?

The F20 code indicates a water inlet problem — no water or insufficient water supply. Select PAUSE/CANCEL twice to cancel the cycle, then check that water faucets are completely turned on, inlet hose screens are not clogged, and hoses are not kinked or frozen. Plug the washer back in, re-select the cycle, and press START; if the problem remains, call for service.