When a uPVC door multipoint lock stops working, it can be frustrating and lead to potential security issues. Multipoint systems rely on multiple hooks, rollers, and bolts working in harmony. As such, even a minor misalignment or fault can jam the mechanism or prevent full locking engagement.
Common Causes
Door misalignment:
Heat, cold, or hinge wear can cause the door to expand, contract, or sag, making the locking points miss the keeps.
Worn gearbox:
This central unit transfers handle movement to the lock points, once it fails, the handle may spin loosely or refuse to engage.
Drooping handles:
Caused by worn springs or misuse, this can stop the locking points from lifting or retracting evenly.
Debris or corrosion:
Dirt in the tracks or rust on hooks can jam the mechanism.
Temperature changes:
Cold weather contracts uPVC frames, making locks stiff; heat expansion can make closing and locking difficult.
DIY Fixes to Try
Check door alignment:
Close the door slowly, if the bolts won’t line up, adjust the hinges slightly. Many uPVC doors have adjuster screws accessible with an Allen key.
Lubricate the mechanism:
Use spray graphite or silicone lubricant on the moving parts (hooks, rollers, latch), avoiding oil‑based products that attract dirt.
Test with the door open:
Lift and turn the handle. If the multipoint bolts move freely when open but not closed, it’s likely an alignment issue, not a faulty gearbox.
Tighten all visible screws:
Especially around the handle and faceplate to ensure stable function.
Avoid forcing the key or handle:
Forcing can strip internal parts or snap the cylinder, leaving the door fully jammed.
Locksmith Tip
If adjustments and lubrication don’t restore function, the internal gearbox may have failed. A qualified locksmith can replace just the gearbox rather than the entire lock strip, saving time and money while restoring secure operation.
Regular cleaning, hinge tightening, and light lubrication once or twice a year will keep your uPVC multipoint lock running smoothly and extend its lifespan.
