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WINDOW OPENING FAULTS

Window Won’t Close

A window that will not close often has dropped hinges, misaligned locking points, swollen material or a damaged handle or mechanism.

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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

Dropped hinges The sash no longer sits square in the frame.
Locking-point misalignment Cams or hooks miss their keeps.
Seal obstruction Folded or displaced seals prevent closure.
Frame or sash movement The opening has distorted or swollen.
◫ Symptom variations Match the opening, closing or support fault. ⌄
  • One corner remains open
  • Handle will not return fully
  • Window closes only when lifted
  • Locking points scrape
  • Seal bunches up
✓ Quick checks Safe checks before dismantling hardware. ⌄
  1. Check for objects or folded seals in the frame.
  2. Support the sash gently and see whether lifting helps.
  3. Inspect hinge arms and screws.
  4. Check locking cams against keeps.
  5. Do not force the handle.
Important: Test gently and support the sash. Excess force can twist the frame or crack glazing.
1 Step 1 — Remove simple obstructions Make the smallest safe correction and retest. ⌄

Clear debris and reseat displaced seals.

2 Step 2 — Correct sash alignment Make the smallest safe correction and retest. ⌄

Adjust or replace hinges where the sash has dropped.

3 Step 3 — Realign locking points Make the smallest safe correction and retest. ⌄

Adjust keeps or mechanism only after the sash sits correctly.

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

A small drop at the hinge side can move every locking point out of position and stop the handle completing its travel.

⌘ Advanced checks Further diagnosis for persistent window faults. ⌄
  1. Check frame diagonals.
  2. Inspect friction hinge geometry.
  3. Assess gearbox and espagnolette movement.
  4. Check seal compression.
  5. Look for structural movement around the opening.
◇ Tools and information needed Useful items for accurate checks. ⌄
  • Screwdrivers
  • Allen keys
  • Spirit level
  • Tape measure
  • Torch
▣ Parts that may need replacing Common hardware linked to this fault. ⌄
  • Friction hinges
  • Window handle
  • Espagnolette or gearbox
  • Keeps
  • Weather seals
! When to call a professional Conditions that should end basic DIY diagnosis. ⌄
  • The window is high-level or very heavy.
  • The glass is strained.
  • The frame is significantly distorted.
  • The lock is jammed partly engaged.
  • The window affects security or weather protection.
? Frequently asked questions Common window opening questions. ⌄

Why does lifting the sash help?

The hinges have probably dropped or worn.

Can I force the handle down?

No. This can break the gearbox.

Could the seal be the cause?

Yes, folded or over-compressed seals can stop closure.