This common issue can be frustrating, but it can often be addressed with basic know-how and simple tools. Understanding the various causes of a window that won’t lock can help you diagnose and fix the issue promptly. Below are some of the most common reasons for a window not locking and advice on how to resolve them.
One of the most frequent reasons a window won’t lock is that it simply isn’t closing fully. This can be due to a number of factors, but the most common are dirt and debris along the frame or issues with the window’s alignment.
Solution
Start by checking the window tracks and frame. Any dirt, dust, or small debris like leaves or even bits of plastic can prevent the window from closing flush with the frame. If you find any obstructions, clean them out thoroughly using a small brush (old toothbrush) or vacuum. Pay close attention to the corners, as dirt can accumulate in these areas and go unnoticed. Once the area is clean, try closing the window again.
If the window is still not closing fully, the problem could be an alignment issue. Over time, a window can become misaligned, especially if the frame has shifted due to changes in the building’s structure or natural settling. You can test this by gently lifting the window or pushing it from side to side. If there’s noticeable movement or if the window isn’t sitting evenly in the frame, it may need to be realigned.
To fix this, you may need to adjust the screws or hinges of the window. Often, modern windows will have adjustable hinges that allow you to change the angle or positioning slightly. Refer to the manufacturer’s guide if necessary, and make minor adjustments to see if it resolves the issue. If the window continues to misalign or it’s beyond a simple DIY fix, you may need the assistance of a professional locksmith or window repair specialist.
Window interlocks are designed to ensure that the two sashes of the window meet and lock properly. When these interlocks become distorted or bent, they prevent the window from locking, or it may require excessive force to engage the lock.
Solution
Examine the interlocks on both the top and bottom sash of the window. If you notice any bending or warping, this is likely the culprit. In some cases, the interlocks can be carefully bent back into place using pliers. Make sure to do this gently to avoid further damaging the mechanism.
If the interlocks are severely bent or damaged, they may need to be replaced. You can purchase new interlock strips from a hardware store or the manufacturer of the window. Depending on the type of window, replacing the interlocks may be a straightforward task that involves unscrewing the old parts and screwing in new ones.
For older windows, this may also be a good time to check the condition of the window seals, as worn or damaged seals can lead to further problems with alignment and energy efficiency.
The keeper is the part of the window where the locking mechanism engages. If the keeper is misaligned, even by a small margin, the lock won’t properly latch. This can happen over time due to shifting of the window frame or natural wear and tear.
Solution
To fix a misaligned keeper, first inspect the lock and keeper when attempting to close the window. You may notice that the lock isn’t engaging with the keeper properly, or the keeper may sit slightly off centre from the locking mechanism.
In most cases, adjusting the position of the keeper is a simple matter of loosening the screws, realigning it with the lock, and then tightening the screws back in place. Be careful to test the lock before fully tightening the screws to ensure that the alignment is perfect.
If the keeper is damaged or worn out, you might need to replace it. Fortunately, replacement keepers are relatively inexpensive and easy to find. Ensure you purchase one that matches the existing lock mechanism.
A window path blockage occurs when something within the window frame or track prevents the window from moving smoothly. This can prevent the window from fully closing and subsequently stop the lock from engaging. Blockages are common in sliding or sash windows, as dirt, dust, and debris can easily accumulate in the tracks.
Solution
Begin by cleaning the window tracks or path thoroughly. You can use a small brush, a vacuum with a narrow attachment, or a cloth to clear out dirt, leaves, and other debris. For tougher grime or sticky residue, use a mild soap and water solution to scrub the tracks.
After cleaning, inspect the tracks for any physical damage, such as dents or cracks, which could be causing the window to stick. If you notice any obstructions that cannot be removed or repaired easily, you may need to replace the track or sash, which should be handled by a professional.
Lubricating the tracks with a silicone-based lubricant after cleaning can also help the window move more smoothly, reducing the likelihood of future blockages. Be careful to avoid oil-based lubricants, which can attract dust and dirt over time.
Sometimes, the issue isn’t with the window itself but with the lock mechanism. If the lock isn’t engaging properly, this could be due to worn-out components, a broken lock, or something blocking the lock mechanism.
Solution
Check the lock itself by engaging and disengaging it several times. If the locking mechanism feels stiff or doesn’t seem to move smoothly, it could be a sign that the internal components are worn or broken. In this case, you will likely need to replace the lock. Most window locks are relatively simple to replace and involve unscrewing the old lock and attaching a new one.
If the lock is blocked by dirt or grime, clean the area around the lock thoroughly. Use a small brush to remove dirt and a spray lubricant to ensure smooth operation.
In some cases, the lock may appear to function correctly, but the window is still not secure. This can happen if the lock isn’t catching properly on the keeper. You can adjust the lock mechanism itself, or in some cases, the window frame may need to be realigned.
Additionally, check to ensure that all screws and hinges are properly tightened. Over time, the repeated opening and closing of a window can cause screws to loosen, which may lead to misalignment or difficulty locking.
If none of the above solutions have resolved the issue, there are other methods to try before calling a professional. One common problem is the warping or swelling of the window frame, particularly in wooden windows. This can occur due to changes in temperature or humidity and can prevent the window from closing properly. In this case, sanding down the window frame where it is swollen or warped can sometimes allow it to close more easily.
You might also consider replacing the weatherstripping around the window. Worn or damaged weatherstripping can lead to drafts and may affect the window’s ability to close securely. Replacing the weatherstripping is a simple and inexpensive fix that can improve both the security and energy efficiency of your windows.
If none of these fixes solves the problem, or if you’re unsure about attempting any repairs yourself, it’s best to call in a professional. A skilled locksmith or window repair specialist can assess the issue and provide a long-term solution, ensuring that your windows are secure and functioning properly.
