On many uPVC conservatory and French doors, lifting the handle should move hooks, rollers or other locking points along the edge of the door. If the handle lifts but the hooks do not come out, the door may be difficult or impossible to secure. The cause is not always the key cylinder.
Start with a simple check
With the door open and supported, gently lift the handle and watch the locking points on the edge. Do not put fingers into the mechanism. If the hooks move with the door open but fail when it is closed, the door may have dropped or the locking points may no longer line up with their keeps on the frame.
If the hooks do not move even while the door is open, there may be a problem inside the multipoint lock, its gearbox or the connection between the handle and the mechanism. Stop if the handle feels unusually stiff, loose or makes a grinding sound.
Common reasons the hooks stop working
- Door alignment: hinges can settle over time, causing hooks to catch on the frame keeps.
- Gearbox failure: the central mechanism can wear or break, so lifting the handle no longer operates the locking points.
- Worn handle or spindle: movement at the handle may not be transferred properly to the lock.
- Damaged locking strip: a bent or seized part of the multipoint mechanism can prevent normal movement.
A locksmith can check the handle, gearbox, full locking strip and alignment before deciding which part needs attention. Replacing a cylinder alone will not normally fix hooks that are failing to extend.
What not to do
Do not force the handle upward or turn the key against heavy resistance. This can damage the gearbox or leave the door jammed shut. Avoid adjusting keeps or hinges at random: even a small change can make several locking points misalign. If the door will not lock, do not assume it is secure just because it is closed.
Information to have ready for a repair
When contacting a locksmith, explain whether the hooks move when the door is open, whether the handle lifts normally, and whether the fault affects one leaf or both leaves of a pair of French doors. A clear photo of the full door edge and the central lock area can help identify the mechanism. Exact parts and repair options depend on what is fitted.
Conservatory door lock repairs in Dundee
Locksmith Dundee Ltd inspects and repairs uPVC door locks and multipoint locking problems in Dundee and nearby areas. For help with a conservatory door that will not lock, see our uPVC door repair service or call 01382 671054. We can assess whether adjustment, gearbox replacement or another repair is suitable.