Bi-fold locking door very difficult to lock, maybe deadlock engagement issue?

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3 Jun 2016
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Hi I have a bi-fold door on the rear of the lounge, about 9-10ft wide at a guess. Its made of three panes and slides from right to left. The left pane can be open and closed like a normal door. The issue is that for a while now locking and unlocking the door is very difficult. There are two hooks top and bottom, the latch and the deadlock which are about 5" apart. The door seems to fit well and lifting the handle and locking with the key is fine with the door not closed.

I've already checked the heights of the holes in the frame plates and they seem to line up with the hooks (top and bottom), the latch and the deadlock. Adjusting the plates that the hooks and latch goes in to didn't help with locking or unlocking, well maybe very slightly but did impact how much movement the door had against the frame when only the latch slots in. I noticed that lifting the handle did reduce the movement and the door sealed as expected I guess. So i think the hooks and the latch are doing what they are supposed to do. Testing locking when the door is open i noticed that the key won't turn if the hooks aren't allowed to come fully out or the deadlock doesn't come out all the way. So I am wondering if the deadlock is not engaging in the hole in the plate in the frame. The issue is I can't see any adjustment in that hole, its a large plate (8-10") that is screwed in at multiple points and also included the adjustment for the latch hole. So I am thinking that might be the issue but I'm finding it difficult to prove that and also even if I did I can't see how I would adjust it in anyway.

Any idea's and also if I can't fix it who would I need to contact and roughly how much should I expect to pay in the west midlands.

Thanks for any advice
 

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