Hi, I'm housesitting for a friend of mine and I

If the door switch is faulty, you can manually open the door.

Get a flat screw driver or butter knife, open the little door on the bottom left of the machine, from right to left.

this is the lid for the water pump filter. You will see a red plastic ring which is normally screwed on to the machine with a philips head screw. Unscrew the ring from its position and pull down until the door pops open.

Good luck.
Ash