How to Repair Double Glazed Windows
There are a few telltale indicators that indicate that your double-glazed windows require repair. Evidently, water ingress or draughts leaking through the frames are an obvious indication of damage to your windows and should be repaired as soon as possible.
The misting could also mean that the window seals are in need of replacement. Replacing the seals can fix the issue and will stop condensation, draughts or leaks.

Broken Panes
Broken glass is among the most common problems that double-glazed windows have to face. Double-pane windows are harder to break than single panes, but accidents can still happen. It is important to repair a broken glass as soon as you can.
Take out any glass fragments that could be in the frame. Wear gloves and eye protection when you remove the glass because it could be extremely sharp. Once the shards have been removed, inspect the floor of your home for any additional loose pieces. Also, it is a good idea to search for any hooks made of metal that might be holding the panes in place and pull these out as well.
After the glass has been removed, you can begin the process of removing the old glazing compound and glazing points (small fasteners that secure the glass to the window frame) and replacing them with new ones. It is a long-winded procedure, and you'll need some tools to accomplish the task. These include latex glazing putty; metallic glazing points; pliers; heat gun; and a putty knife.
It is recommended to begin at the top and work your way down as you remove the old points and glazing compound. This will prevent getting any of the paint or sash's wood stuck to the tool. If you do remove some of the sash's wood make sure you employ a chisel or a utility knife instead of a chemical stripper, because this could cause damage.
Finally, when you're finished make sure you remove any wood that is not sanded to smooth it. Once the wood is smooth then you can seal it using linseed or clear wood sealer. This will shield it from water and further damage.
There are a few easy solutions you can try for a window that is cracked by a double-pane however, these methods will not repair the crack and should be used only as a temporary measure. The use of silicone caulk can help seal the gap. However, it is important to use high-quality caulk with proper application methods.
Condensation
If you notice a haze of moisture or mist between the glass panes of your double glazing it is a sign that the window seal isn't working. This can be a problem because it stops the gas or air that is used to insulate from being trapped between the two glass panes which means it cannot do its job properly and this will lead to temperature changes which can cause condensation to form.
Fortunately, the issue can be fixed by a double glazing expert. To fix the problem your window company will remove the affected window sash as well as the IGU (insulating glass unit) before blowing in a new gasket to make a strong and airtight seal that will prevent condensation from occurring again. They'll also apply a specific drying agent to aid in drying the area and prevent the condensation from occurring again.
Another reason you might notice a misty appearance between the glass panes of windows that are double-glazed is that the frame has moved over time, which causes cracks in the seal that is so crucial. repairs to double glazing can be a problem since it means that your windows won't function properly and lose their energy efficiency.
It is possible to replace a double-glazed window's panes however, this can be costly and is typically only needed if the window is beyond repair. If you have a problem with your double-glazed windows and are still within the warranty period, you may be able to repair it at no cost or for a reduced price.
Check your warranty terms before contacting the company to determine if they can resolve the problem without replacing the whole window. Double glazed windows are generally covered by guarantees of between 10 and 20 years, so you may find that they can repair the defective window units instead of replacing them completely. If this is the case, then they'll likely send a specialist out to repair your double glazed windows and are usually able to do so quickly. This is a cheaper alternative to purchasing and installing new double-glazed windows. It's also better on the environment!
Broken Locks & Handles
If the handle on your window is damaged or difficult to open, it could be a major issue since it hinders you from using your windows. It can also give burglars the chance to break into your house. There are several solutions to this problem however the most effective option is to connect with an uPVC professional. Depending on the severity of the issue they will usually be able to fix it for you, or at the very least, provide you with an alternative handle.
There are several kinds of window locks but the most popular is the Maco or Mila locks that are commonly found on uPVC frames. These locks employ bayonet rods to lock and these can easily seize up. If this occurs, the handle's nose will be stuck in the out position and cannot be returned to the locked wedge. This can be a frustrating issue, but it can be solved with a few easy steps.
To fix the issue, you will need to first remove the handle, which should be easy enough with the aid of a screwdriver. Once the handle is removed, you'll be able to see the screws that secure the lock to the frame. Once the screws are removed, you can attempt to grab the bolts using a wrench or pair of pliers. If this fails then you might need to insert the tool through the gap between the window and frame (the gap may be different on each end of the window) and then make an "u" shape with your hand to try to grasp the bolts.
You can shut your window by adjusting the handle to the closed position if you're capable of removing the bolts that shoot. But it won't be able to be able to open again using the handle because the gearbox (espag or espagnolette) will probably be faulty. It is possible to repair the gearbox without the shoot bolts, so the window can be opened using the handle (and it will remain secure) However, you'll have to purchase a new handle and gearbox.
Broken Hinges
It is possible to replace or repair your uPVC windows hinges if they aren't functioning smoothly. It could be because the window was opened too vigorously or the hinge snapped. Or, they may have a flaw. Thankfully the replacement of the hinge is easy and quick and doesn't require you to purchase a new window and you can have the old ones repaired instead.
Take off the hinges. This is accomplished by removing the screws that attach the hinges to the frame. After you've removed the hinges you can replace them with plywood boards cut to the proper size. Make sure the plywood is larger than the original one so that it can withstand the weight of the window both it is closed and open. It is also recommended to use a wood filler to ensure that the hole left by the old hinge is completely filled and will not leak or break in the near future.
After you've replaced hinges and filled the holes, you'll need paint them. Be sure to use a high-quality paint to ensure that it will last for as long as it can. Once the paint is dry, you can reattach the window. Secure any screws that are loose.
Window hinges also require regular maintenance. You can ensure they last longer by regularly cleaning the tracks of friction and lubricating the hinge mechanism. You can also use a wood preservative to shield them from the elements, which can help to stop corrosion and keep them looking great for as long as you can.
Having a double glazed window can help you save money on heating costs, as it's more energy efficient than windows with only one glass. However, like any other component of your home, windows will show wear and tear and might need repairing or replacing in time. Our Preston experts can assist you if there are signs that your double-glazed windows are not working properly.