Door problem Indesit WD 12 X

Question edited for clarity.

It could be many things, failed pump motor, failed mainboard and as you say, the door switch. There are some ideas in the link, but you would be advised to call your local Indesit Service Agent. Try a power cycle reset.

https://www.google.com/search?q=indesit+dishwasher+won%27t+start+but+has+power

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I suspect that the logic board has developed a fault and probably needs replacing. 'Phone your Indesit Service Centre and get an engineer out. I believe a replacement board costs about £100 fitted, but a 12-month service plan paid monthly may be a bit cheaper, and will cover further breakdowns. Unfortunately, these boards are not the most robust or reliable examples of technology.
Turn off the power to the machine; preferably unplug it.
If you can open the door(?), bale out the drum by hand. I don't think there's a pump/filter access panel on this machine, so it's not easy to get the water out. You could try
disconnecting the discharge hose from the pipework, then lower the open end over a washing-up bowl so that the water drains from the drum by gravity. It depends how close to the floor you can get the open end. When enough water has drained, it should be possible to open the door to remove the laundry. Sorry, this may take a while.
Hope this has helped.

Unplug machine, take lid off and locate the door lock. You will have to use a small screwdriver or something to release the lock. Then replace your door handle.

UNPLUG IT

Put a length of strong string around the door on the catch side and pull hard both ends and the door should release

sounds like your interlock has failed you can buy from any appliance spares outlet or online regards jason

you can open it from the inside, take the lid off ensuring its disconnected from the mains, u will see the back of the door catch unit (with a torch). i managed to open mine with a screwdriver :)

Turn the spring tension screw anti clockwise to reduce the spring strength Regards Engineer

undo the screws at the top of the front door and puul the control unit out this gives you acsess to the door catch which is quite simple to replace be careful the stainless steel is quite sharpe