Try this test,
go through the procedure ,ie set cycle and start the machine,
immediately pull the plug and try to open the door,
if you can open the door then it is likely the interlock has failed.
Don't try and open the door with the machine still powered up,you may damage the pcb/module.
Its possible the machine won't start because it thinks the door is open.
Another way to test the interlock is to see if you can select spin only.
paul
March 2012