A common reason for the interlock going faulty is some one trying to force the door open before the interlock is ready to release the door. If you find the door on your washer will not open the first thing to do is look through the glass section of the door and try to identify whether there is even a small amount of water in the machine. If there is, then that is the likely reason the door will not open. If you can clear the water the the door will probably open without the need to try and force the interlock to open the door.
In this instance the best 3 ways to try to clear the water, is first, using the main program controller select stop, then select reset or go straight to reset and wait about 5 second. On some machines a neon light on the control panel will start to flash. On other machines the neon will change from illuminating near the word wash to illuminating near the word stop, and other machine may not have any neon lights at all, and you will need to work out how your machine reset feature works and that may mean consulting your user manual.
Once you have done that select drain or spin this should empty any access water in your appliance and then the door should open after the 2 or 3 minute delay. If when you select drain or spin you do not hear the pump come on. Its normally a light whirling sound coming from the front right hand side of the machine and there is still water in the appliance you can try emptying the water from the pump filter or by placing the washing machine waste pipe hose into a mop bucket and letting gravity do its work, but beware both these methods could cause a lot of water to end up on your floor, once all the water has gone the interlock should release the door after the 2 or 3 minute delay, if none of these methods work for you then you will probably need a engineer or specialist.
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