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WINDOW OPENING FAULTS

Window Keeps Falling Open

A window that will not hold position usually has worn friction hinges, failed stays, weak balances or incorrectly adjusted hardware.

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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

Worn friction stays The hinges no longer provide enough resistance.
Failed balance system Spring or spiral balances cannot support the sash.
Loose stay hardware Fixings or pivots have movement.
Incorrect adjustment Friction or balance tension is too low.
◫ Symptom variations Match the opening, closing or support fault. ⌄
  • Casement drops fully open
  • Sash slides down
  • Window will not stay partly open
  • Problem worsens over time
  • One side falls faster
✓ Quick checks Safe checks before dismantling hardware. ⌄
  1. Identify the window type.
  2. Inspect stays, hinges or balances.
  3. Check fixings and visible damage.
  4. Support the sash during testing.
  5. Look for broken cords or springs.
Important: Test gently and support the sash. Excess force can twist the frame or crack glazing.
1 Step 1 — Identify the support system Make the smallest safe correction and retest. ⌄

Casement, tilt, sash and roof windows use different hardware.

2 Step 2 — Check adjustment and fixings Make the smallest safe correction and retest. ⌄

Correct minor looseness only where designed for adjustment.

3 Step 3 — Replace failed supports Make the smallest safe correction and retest. ⌄

Fit matched hinges, stays or balances rated for the sash.

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

Window support hardware is selected for the sash weight. Wear, loss of tension or broken parts allow gravity to take over.

⌘ Advanced checks Further diagnosis for persistent window faults. ⌄
  1. Measure sash size and weight.
  2. Identify hinge or balance codes.
  3. Check both sides for equal tension.
  4. Inspect restrictor function.
  5. Assess frame fixing points.
◇ Tools and information needed Useful items for accurate checks. ⌄
  • Screwdrivers
  • Tape measure
  • Support prop
  • Manufacturer information
  • Safety gloves
▣ Parts that may need replacing Common hardware linked to this fault. ⌄
  • Friction stays
  • Spiral balances
  • Spring balances
  • Restrictors
  • Fixing screws
! When to call a professional Conditions that should end basic DIY diagnosis. ⌄
  • The sash is heavy.
  • The window is high-level.
  • The sash could fall onto someone.
  • Balance replacement requires sash removal.
  • The window is a roof or specialist system.
? Frequently asked questions Common window opening questions. ⌄

Can friction hinges be tightened?

Some have limited adjustment, but worn hinges usually need replacement.

Why does one side drop first?

One hinge, balance or cord may have failed before the other.

Should I prop the window open?

Only temporarily and safely. Repair the failed support system.