We have 2 external upvc doors, both of which have never fitted properly.
There are 2 allen-key operated adjusters on each hinge but am not sure which one does what.
Top one appears to lift door up, bottom one appears to move it to & from the frame.
Problem is the door not closing to the frame fully - can lock & unlock it, but is draughty.

John, December 2010

depending on your locking mechanism if you look down the edge of your door on the lock side you might see 4 or 5 round pins with an allen key centre if you put the allen key in these pins and turn them you will notice the the pins move to the left or right by adjusting these when you pull the handle up as to lock the door these pins slide up and down into metal keepers on the frame by adjusting the pins it pulls the door closer to the frame hope that helps

tebaspain, December 2010