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Why Won't My uPVC Door Lock Properly?

If your uPVC door won't lock, it's usually one of four things. Here's how to tell which.

The door has dropped

Try lifting the door slightly while turning the handle. If it locks now, hinge adjustment is needed.

Gearbox failing

The handle lifts but the locking points don't all engage, or it feels gritty and inconsistent.

Misaligned keeps

You can see scrape marks on the frame where the locking hooks hit instead of slotting in.

Failed cylinder

The handle and points work but the key won't turn — the cylinder itself has failed.

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Frequently asked questions

Hinge adjustment yes if you're confident. Gearbox or cylinder replacement is best left to a locksmith who can match the part.

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