It is possible it could be a fault ribbon cable, it may also be a failed sensor, however I have seen exactly the same fault on a Ignis\Whirlpool machine last month and it was the control board, other faults caused by connections or sensors generally do not result in all lights being illuminated, and the "1 minute" error being shown on the display.
I had a look at your manual and there is no detail as to how to fit the door which is a first I have to say, normally there are screws on the side of the door, or the door is just clipped on. If you cant see any screws to the side, I would be inclined to remove the screws around the inner door then see if you can lift the front false door off the front (and by doing so will make the door easier to work with. Make sure you have some A4 paper to hand and place them in the order\location you take them off, as some are different thread and length so it makes it easier putting it back together, if you have the layout on the A4.
Removing the control board is just a case of using a screw driver to move the clips back which hold it in place, make sure you disconnect the unit from the power first and do not apply to much false as the clips are easily broken.
Its a good idea to take a picture of the board before starting to help remind you which plugs \ cables go where.
If you get stuck give me a shout.