
uPVC Window Won't Lock or Handle Won't Turn?
Most window-locking faults are a quick fix, not a new window. How the espag and gearbox work, what each symptom means, the DIY checks to try, and the part-matching trap.
Calm, step-by-step fixes for everyday lock and door problems — the ones that aren't an emergency yet, and how to keep them from becoming one.

Most window-locking faults are a quick fix, not a new window. How the espag and gearbox work, what each symptom means, the DIY checks to try, and the part-matching trap.

Most “key won’t turn” cases are simple and free to fix — the steering lock is the usual culprit. The checks to try in order, and the one mistake that snaps the key.

Most dead-fob problems are small and cheap — usually the battery. The checks to run in order, and how to tell a flat remote from a chip the car no longer recognises.

Before you force it — why windows jam, the safe way to free a stuck handle, sash or seized mechanism, and why it is usually the lock that has failed, not the whole window.

A spinning handle and a stuck latch are usually a small, cheap part — until they're forced. The finger test that finds the fault, the likely culprits, and how to avoid a door-off job.

When a composite door won't lock, it's almost never the part you can see. The heavy-slab failure pattern explained — dropped doors, gearbox failure, cylinder faults — what you can safely fix yourself, and when to stop before a stiff handle becomes a snapped one.

Two different problems wear the same words. How to tell a door-and-mechanism fault (a garage-door engineer's job) from a lock fault (ours) — and why the springs are the one thing never to touch.

The key won't turn — or it turns but nothing happens. One quick test tells you whether it's the door, the mechanism or the cylinder, and what to try before you force it.

A stiff door is an early warning, not a quirk. The 30-second test, the seasonal damp-cloth trick, the dropped-door gap check, the right lubricant, and the moment it becomes a security problem.

The 30-second test that tells you whether it's the door or the mechanism, why forcing the handle turns a quick fix into a lockout, and what a repair really involves.
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