It means that one of the drawers has leaked and water is in the bottom tray under the lower drawer. The lower drawer has to be removed and the tray completely dried off then the machine will run. However, it will return if the drawer leaks again. You really need to find why it leaked and repair that as well. Continually flooding the lower tray runs the risk of shorting out the power and probably damaging the control boards. (one on each drawer)
Lincoln Appliance NZ, January 2012