How to Fix a UPVC Window Locking Mechanism ?

UPVC windows are widely popular for their durability, low maintenance, and energy efficiency. However, like any mechanical system, their locking mechanisms can sometimes fail. Knowing how to fix a UPVC window locking mechanism yourself can save time and money. This guide will walk you through the process, step-by-step, ensuring you have the tools and knowledge to get your window secure again.

Understanding UPVC Window Locking Mechanisms

Before diving into fixing any issues, it’s crucial to understand how UPVC window Hardware/locks work. Typically, these mechanisms consist of multiple components:

1. Gearbox: The internal mechanism that controls the locking points
2. Espagnolette: The multi-point locking system that secures the window at multiple points
3. Handle: The external control that engages and disengages the locking system
4. Keeps: The metal plates attached to the window frame that the locks engage with

Common Issues with UPVC Window Locking Mechanisms

Before diving into the solution, it’s essential to identify the problem. Some of the Common issues include:

Misaligned Window: The sash doesn’t align with the frame, preventing the lock from engaging properly.

Broken Handle: The handle feels loose or doesn’t turn.

Faulty Gearbox: The locking mechanism inside the window frame is jammed or broken.

Damaged Espag: The espagnolette locking strip may be bent or worn.

Worn Keeps: The keeps (striker plates) may have shifted or degraded over time.

Tools You’ll Need

• Screwdrivers (Flathead and Phillips)
• Allen keys
• Lubricant (such as WD-40)
• Replacement parts (handle, gearbox, espag, or keeps)
• Spirit level (to check alignment)

Steps To Fix  a UPVC Window Locking Mechanism

Diagnose the Problem

Before attempting any repairs, carefully examine your window:

• Checking if the handle moves freely. If it’s stiff, it might need lubrication or replacement.
• Inspecting the alignment of the window sash and frame. Look for gaps or uneven spacing.
• Listening for unusual sounds, such as grinding or clicking, when turning the handle.

Lubricate the Mechanism

Sometimes, a simple application of lubricant can solve the problem. Before applying, check for signs that lubrication might be the issue, such as stiffness in the handle movement, squeaking noises, or difficulty engaging the lock.

• The locking strip (espag)
• The gearbox inside the frame
• The keeps and hinges

Move the handle several times to distribute the lubricant evenly.

Adjust the Hinges

Look for signs of misalignment, such as uneven gaps between the sash and the frame or difficulty closing the window.

If the window is misaligned:

• Use an Allen key to adjust the friction hinges. Most UPVC windows have adjustment screws that allow you to raise, lower, or shift the sash left or right.
• Check the alignment with a spirit level.

If you need a new one, explore our range of Friction Hinges for UPVC windows.

Replace the Handle

If the handle is damaged, you can often spot the issue by:

• Checking for visible cracks or wear on the handle.
• Testing if the handle is loose or wobbles excessively.
• Observing difficulty when turning the handle or it failing to engage the locking mechanism.

If the handle is damaged, It requires replacing

• Remove the screws holding the handle in place.
• Pull out the handle and inspect the spindle for wear.
• Insert the new handle, ensuring the spindle aligns with the gearbox.
• Secure the handle with screws.

You can always find Our high-quality replacement handles at Handles for UPVC Windows.

Repair or Replace the Gearbox

A faulty gearbox can often be identified. For instance, if the handle turns without engaging the locking mechanism, or if it feels unusually stiff or jammed, the gearbox may be damaged. Additionally, inspect the gearbox visually after removing it from the frame. Look for signs of wear, such as broken or worn teeth inside the mechanism. If these issues are present, it is likely the gearbox needs replacement.

A faulty gearbox is a common issue. To fix it:

• Unscrew the handle and remove the espag locking strip from the frame.
• Locate the gearbox (it’s the central part of the espag strip).
• Inspect the gearbox for visible signs of wear or damage, such as worn or broken teeth inside the mechanism.
• Check if the locking points fail to engage or if the gearbox feels stiff when operating the handle.
• If broken, replace it with a compatible part.

Looking for replacement gearboxes? Check out our extensive collection at Gearboxes for UPVC Windows to find the perfect fit for your window.

• Remove the handle and the espag locking strip to access the gearbox.
• Inspect the gearbox for signs of damage, such as worn or broken teeth or jammed components.
• Purchase a compatible replacement gearbox from a trusted source. Ensure it matches your window’s specifications.
• Install the new gearbox by aligning it with the espag locking strip and securing it within the frame.
• Test the handle and locking points to ensure smooth operation.

Check and Adjust the Keeps

Keeps that are out of alignment can prevent proper locking. To identify misaligned keeps:

• Look for visible gaps between the sash and the frame when the window is closed.
• Check if the window is difficult to close or if the locking points fail to engage smoothly.

To fix:

• Loosen the screws on the keeps.
• Adjust their position so they align with the locking cams on the espag.
• Tighten the screws.

Keeps play a vital role in ensuring your UPVC window locks function properly. If your keeps are misaligned or damaged, replacing them can restore smooth operation. Explore our selection of Keeps for UPVC Windows to find the right fit for your needs.

Common Mistakes to Avoid

Using Excessive Force: Forcing the handle can worsen the damage.

Skipping Lubrication: Neglecting lubrication can lead to premature wear.

Misaligning Components: Ensure all parts are properly aligned before tightening screws.

Ignoring Regular Maintenance: Regularly clean and lubricate moving parts to extend their lifespan.

Understanding and maintaining your UPVC window locking mechanism can save you money, improve home security, and extend the life of your windows. Regular maintenance and timely repairs are key to keeping your windows functioning smoothly. By following this comprehensive guide, you can effectively fix a UPVC window locking mechanism and keep your windows functioning smoothly for years to come. For high-quality replacement parts, browse our extensive collection of locks and keys.

FAQs About Fixing UPVC Window Locking Mechanisms

Why won’t my UPVC window lock?

Misalignment, worn parts, or a broken gearbox are common causes. Follow the steps above to diagnose and fix the issue.

How do I know if my gearbox is faulty?

If the handle turns without engaging the locks or feels jammed, the gearbox is likely the issue.

Can I fix the locking mechanism myself?

Yes, with the right tools and replacement parts, most homeowners can fix their UPVC window-locking mechanisms. However, for complex issues, consult a professional.

Are UPVC window locks secure?

Modern UPVC window hardware offers excellent security features, especially multi-point locking systems.