Faulty euro cylinder the door furniture and hardware on a composite door is practically identical to a upvc door so.
Rock door lock problems.
Tighten the hinge screws and then try adjusting the strike plate by loosening its screws and shifting it slightly.
Step 1 if the key turns but does not operate the lock bolt the lock mechanism is broken.
This can make the door difficult to close.
Excessive use or not using it often believe it or not may cause these mechanisms to become defective or stuck.
The tolerances on doors and hardware is fairly narrow.
These difficulties fall into two general categories.
Those related to the lock set or key and those related to the door s frame and latch assembly.
Faulty mechanism mechanisms on composite doors are.
Door lock problems are mostly mechanism issues and sometimes they become faulty through wear.
Remove the mechanism to have it repaired or replace the lock set yourself.
Like a medical problem this is what we call a symtom.
If a door is sagging the lock will not latch correctly.
Door hardware only works properly on a door that is aligned the way it should be.
Also a broken bolt or latch that causes your door lock to jam might be a symptom of a much larger issue like an attempted home break in.
Warped door it is a rare occurrence but composite doors can sometimes warp.