Firstly check your filter - if the machine can't pump out the water it won't spin. also check outlet hose for blockages and kinks and if the outlet hose connects to the sink plumbing then check that connection as well.
Next check that the machine can spin empty. If it can it may be that the load you have in it is unbalanced. Modern machines check OOB electronicly and won't spin an OOB load.
If the machine won't spin empty it could be the motor brushes need changing
Mike
April 2010