F1 means that flood switch has operated due to water leaking down on to the floor tray. Turn off power at wall, remove panel below door to gain access to underneath. With power off, reach in & dry floor tray then run machine with panel off to see if more water leaks & where it comes from. One common place to leak is the rollers for the top tray. Check each one with a screwdriver to see if it is tight. If loose then water will leak through the screw hole.
Lincoln Appliance NZ, April 2010