If your upvc door won t lock even when still open this is usually because of the following reasons.
Multi lock door wont lock.
Lift the handle turn and remove the key step 1 close the door.
Multipoint lock is damaged.
Warping if the door cannot physically lock due to the frame or door being warped an adjustment of the strike plate could rectify the problem without the need of a new lock.
Door lubrication is required.
Upvc gearbox failure or multipoint lock damage.
This problem with the multi point locking system can develop over time until the lock suddenly stops working.
How to free a stuck lock.
This is the kind of door hardware that runs the entire span of the door frame and engage.
Problem with lock cylinder.
A slip of a cog or a broken spring maybe.
Key will not work if you ve had a new spare key cut recently it could be a poorly cut key causing the problem.
Step 2 lift the handle.
If the locking mechanism is an all in one then you have a problem within the bottom mech box which holds the bottom hook.
Upvc door won t lock even when open.
Upvc gearbox failure most common.
Have you had a new cylinder fitted.
On doors where there is a multi point locking system this can be a sign that the system has been worked too hard.
If you can t get the bottom hook up by sliding something in and pushing up then the teeth or a slipped cog is in the way and your probably not going too.
It can also indicate the cam has become worn.