F05 is a draining error,
remove the kick panel at the bottom of the machine,it just pulls off.
Behind the panel on the machine is a filter inspection cover,get yourself a shallow dish and put it under the filter,
twist the filter cover anti clockwise and clockwise to tighten when you need to empty the dish.
Once you have drained the water,remove the filter cap and filter,and remove all debris in the housing.
whilst you are down there look into the filter housing and see if you can see anything stuck in the pump,
the pumps impeller should turn freely,
if you need to check that the pump is working then put the machine on SPIN ONLY, and see if you can see it running.
paul
March 2012