IS the pump blocked? try lowing the outlet hose into a bucket and check whether the water leaves the drum, once empty try seeing if it will spin again, if it works then you need to check the pump for either a blockage or failure.
Oh dear, am I becoming indispensable . You are probably best to do what Breezer suggests. You can take the back off but there are about a zillion screws for the back of the washer driers. There is not a proper filter but there is a trap fitted to the drum outlet hose. Look in there and also dismantle the pump to see if there is anything caught inside.
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