Can you get to the machines outlet pipe? If you can have a bowl handy & lower the outlet pipe to the bowl & it should drain that way. The reason the door wont open is because of the interlock in the door, the pressure switch is still telling it that it is full of water. Once the water has drained then there should be a "click" & the door should then open.
If water dosen't drain quickly then there is possibly a blockage in the filter, or there may be a button in the pupm or outlet pipe.
Thanks,
Rob
Rob Knights, December 2005