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WINDOW OPENING FAULTS

Window Lock Broken

A broken window lock may involve the handle, spindle, espagnolette gearbox, locking strip or frame keeps.

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Avoid forcing the sash or levering near glass

Large, high-level and emergency escape windows can be hazardous. Support heavy sashes and stop if the frame, glass or locking mechanism is under stress.

MOST LIKELY CAUSES

Start with locks, hinges and alignment

Broken handle The lever no longer drives the spindle.
Worn spindle Rotation is not transferred to the gearbox.
Failed gearbox Internal parts no longer move the locking points.
Damaged keeps Locking points cannot engage securely.
◫ Symptom variations Match the opening, closing or support fault. ⌄
  • Handle spins
  • Window will not lock
  • Locking points stay still
  • Handle is jammed
  • Window locks only at one point
✓ Quick checks Safe checks before dismantling hardware. ⌄
  1. Test with the window open if possible.
  2. Check handle screws and spindle.
  3. Observe locking-point movement.
  4. Inspect keeps for damage.
  5. Do not force a jammed handle.
Important: Test gently and support the sash. Excess force can twist the frame or crack glazing.
1 Step 1 — Identify the failed layer Make the smallest safe correction and retest. ⌄

Separate handle, spindle and gearbox faults.

2 Step 2 — Match the replacement Make the smallest safe correction and retest. ⌄

Measure screw centres, spindle and gearbox dimensions.

3 Step 3 — Restore alignment Make the smallest safe correction and retest. ⌄

Make sure the repaired lock engages without excessive force.

⌁ Why the problem happens How locks, hinges, balances and frames affect movement. ⌄

Modern window locks combine several components. A fault in one small part can stop all locking points working.

⌘ Advanced checks Further diagnosis for persistent window faults. ⌄
  1. Identify espagnolette markings.
  2. Measure backset.
  3. Check shoot bolts.
  4. Inspect corner drives.
  5. Assess sash alignment before fitting parts.
◇ Tools and information needed Useful items for accurate checks. ⌄
  • Screwdrivers
  • Tape measure
  • Torch
  • Replacement handle
  • Manufacturer information
▣ Parts that may need replacing Common hardware linked to this fault. ⌄
  • Window handle
  • Spindle
  • Espagnolette or gearbox
  • Keeps
  • Locking strip
! When to call a professional Conditions that should end basic DIY diagnosis. ⌄
  • The window cannot be secured.
  • The lock has failed shut.
  • The opening is high-level.
  • There are signs of forced entry.
  • A full locking strip or specialist system has failed.
? Frequently asked questions Common window opening questions. ⌄

Is the handle always the problem?

No. A healthy handle can still be connected to a failed gearbox.

Can I replace the gearbox only?

Often yes, if a matching part is available.

Why did the new handle not fix it?

The spindle or internal locking mechanism may be the actual fault.