how are you turning the impellor?.Is it visably rotating when you select drain and set the machine going?.if it does rotate then start looking for a blockage in the drain hose or sink waste if connected to one.the impellor should flick as you manually turn it with a screwdriver.if it doesn't flick it is a fault drain pump.
ck
December 2010
I can answer this question...
AEG Lavamat 527600 Drain Pump wheel turns ,but does not empty?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix washing machines.