My UPVC door handle goes up but the door won't lock — what's wrong?

This is almost always a failed gearbox inside the multi-point mechanism. The gearbox is the central component that drives the locking points up and down as you lift the handle. When it fails, the handle movement is not translated to the bolts and the door appears unlocked even when the handle is raised. We replace gearboxes same-day and carry the most common sizes on the van.

Can you repair my UPVC lock without replacing the whole door mechanism?

In most cases, yes. The majority of UPVC lock faults are caused by a single failed component — usually the gearbox, the cylinder, or a locking point. We diagnose the fault on site and replace only what is necessary. A full mechanism replacement is only recommended when the strip itself is damaged or severely corroded.

My UPVC door key turns but the door won't open — what does that mean?

If the key turns freely but the door doesn't open, the problem is usually a failed cam follower or a broken connection between the cylinder and the gearbox. This is a common fault on older UPVC doors. We can diagnose and repair this in a single visit, and if the cylinder itself has worn we can upgrade to an anti-snap version at the same time.

UPVC multi-point lock mechanism exposed on a door being repaired in Ipswich

UPVC Lock Repair Ipswich

UPVC doors are the most common door type in Ipswich — and their multi-point locking systems are also the most frequently repaired. A gearbox failure, a seized cylinder, a broken locking point or a misaligned door frame can leave your home insecure and the door impossible to open or close properly.

Local Locksmith Ipswich specialises in UPVC lock repair across Ipswich and Suffolk. We carry the most common gearboxes, cylinders and locking points on the van, and most repairs are completed in a single same-day visit. Every repair is covered by our 12-month workmanship guarantee.

Common UPVC Lock Faults We Repair

UPVC multi-point locks are mechanical systems — and like all mechanical systems, they wear over time. These are the faults we see most often in Ipswich:

Gearbox failure — handle lifts but door won't lock; locking points don't engage when the key turns
Stiff or worn euro cylinder — key turns with difficulty or not at all; common after attempted break-in or general wear
Snapped key in lock — key breaks inside the cylinder; requires extraction and usually cylinder replacement
Misaligned locking points — bolts and hooks don't line up with the keeps in the frame; often caused by door sagging or frame settlement
Broken handle mechanism — handle spins freely, feels loose, or won't spring back; sprung cassette or spindle failure
Door won't close or latch — latch not catching the keep; adjustment or keep repositioning needed

Most UPVC lock faults are caused by a single failed component. Replacing just that part — not the whole mechanism — is the right fix in the majority of cases.
Local Locksmith Ipswich

Locksmith removing and replacing a UPVC door gearbox in Ipswich

New anti-snap euro cylinder being fitted to a UPVC door in Ipswich

Repair or Replace the Full Mechanism?

We always give an honest assessment on arrival. In most cases, replacing the gearbox alone restores full function. If the locking strip itself is cracked, corroded or has multiple failed points, a full mechanism replacement may be the better long-term value — and we'll explain both options with clear pricing before starting.

If the existing cylinder lacks anti-snap protection, we recommend combining the gearbox repair with a cylinder upgrade — it adds minimal cost and significantly improves security. See our anti-snap locks page for details. For non-UPVC door lock repairs, see our general lock repair service. If the door itself needs a replacement mechanism, see our lock replacement service.