If the handle lifts but the key will not turn, or the door will not catch at all, here is what is usually going wrong and when it needs urgent attention.
A uPVC door that suddenly will not lock is one of the most common evening callouts we get around Egham, Thorpe, Addlestone and Chertsey. Sometimes the handle lifts but the key will not turn. Sometimes the key turns but the hooks will not throw. And sometimes the whole door has to be pushed or lifted in exactly the right way just to shut. The good news is that these faults usually give warning signs before they fail completely.
What usually causes a uPVC door to stop locking
- Door misalignment. The door has dropped slightly, so the hooks or rollers no longer line up cleanly with the keeps.
- A worn euro cylinder. The key starts sticking, turning roughly, or refusing to come out smoothly.
- A failing multipoint mechanism. Internal parts wear out, especially if the door has been stiff for months.
- Heat, cold or swelling. Composite and uPVC doors can move enough through the seasons to expose an underlying alignment issue.
What you can safely try before calling
First, test the door while it is open. If the handle lifts and locks properly when open but not when shut, that points to alignment rather than the cylinder itself. Check whether the door needs to be lifted, pulled or slammed to engage. If it does, stop forcing it. Repeatedly wrenching the handle is how a repair turns into a full mechanism replacement.
If the key is stiff, try a graphite-based lock lubricant if you have one. Do not flood the cylinder with random oil sprays, and definitely do not keep twisting harder. If the key snaps, you have added a second problem to the first.
When it is an emergency
Call straight away if the door is stuck locked with you outside, jammed shut with someone trapped inside, or it will close but not secure at all. Those are the situations where a same-day or evening locksmith visit makes sense. If the door still locks reliably and the issue is only occasional, it can often be booked as a planned repair before it fails completely.
Repair or replace?
Not every faulty uPVC door needs a full new mechanism. Sometimes a careful adjustment and a correctly sized new cylinder solves it. Sometimes the gearbox or centre case has worn out and the mechanism needs replacing. The key is diagnosing the actual fault instead of swapping parts blindly.
If your door has also been hard to lift or unlock for a while, read our guide to anti-snap cylinders as well. A local visit can also combine a repair with a more secure cylinder upgrade. See emergency locksmith callouts or lock changes and upgrades for the next step.
We also cover nearby areas including Addlestone, Chertsey and Staines-upon-Thames, so if you are just outside Egham or Thorpe it is still worth calling.
Emergency locksmith
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We cover Egham · Addlestone · Chertsey · Staines-upon-Thames and the wider Surrey, west London and east Berkshire area — see full coverage.