Proper maintenance and fast repair of PVC windows is the key to thermal comfort and safety in the house. In this article, we will suggest how to fix plastic windows, what are the most common malfunctions, how to deal with them and when it is worth seeking help from specialists. If you are looking for information on repair of PVC window handles, Repair of the window mechanism whether Repair of window fittings, you've come to the right place. Check out our guide and learn how to restore full functionality to your windows!
The most common problems with PVC windows - or what breaks most often?
Plastic windows (PVC) are very popular due to their durability and energy efficiency. However, like any technical solution, they can undergo minor failures over time. The most common problems include:
Unsealing the window — air enters the interior, and thermal comfort decreases.
Problems with closing or opening — the sash locks or does not close properly, which reduces the comfort of using the window.
Unadjustable fittings — the handle works with resistance or vice versa - too large clearances are felt.
Damaged seals — even minor damage and wear of gaskets leads to significant heat loss.
Incorrect operation of the handle — rotation of the handle around its axis or loosening of the handle, can cause problems with the correct operation of the PVC window.
Damage to the tilting mechanism — problems with the tilting of the window make the PVC window joinery lose its functionality.
Each of these problems can in many cases be solved independently, which saves time and money. In the next part of the guide, we will tell you how to fix a plastic window step by step.
How to fix the most common malfunctions of a PVC window?
1. How to fix a cracked window?
If you feel a draft or see that the window does not adhere perfectly to the frame, the problem is most often a misalignment of the fittings or a worn gasket.
What can you do?
Adjustment of fittings — with the help of a hex wrench (most often 4 mm) you can adjust the settings of the sash relative to the door frame. The adjusting screw is usually located on the window hinges and the overhang.
The “Window Service” application is also available. This is a mobile application developed by the manufacturer of fittings - the company Winkhaus, which helps in servicing and maintaining windows, and also conducts a step-by-step process of their adjustment.
Adjusting the clamping force of the window leaf - There are eccentric rollers on the window leaf, which can be adjusted with a hex key. By changing the position of the rollers, you can increase the clamping force (the rollers must be turned in the direction of the seal) or reduced (rotation in the opposite direction).
Replacing the gasket — if the gasket is sparse or cracked, remove it, clean the groove thoroughly and press in a new gasket of suitable cross-section.
2. How to fix a non-closing window?
If the window does not close smoothly or hooks on the frame:
Check the hinges — may require adjustment of the tightening or slightly raising of the sash by adjusting the screws at the hinges.
Repair of window fittings — if the fitting is damaged (e.g. broken hooks), it may be necessary to replace it. In this case, it is necessary to contact a specialized service.
3. How to fix the problem of opening or tilting the window?
Repair of a tilt-and-turn window and its mechanism is a frequent topic raised among people who own PVC windows. If the sash opens or opens incorrectly:
Make sure that the handle on the tilting window is set in the appropriate positions (vertical, level). If it rotates loosely, it may be necessary to replace the latch, the lock cassette or the handle itself. Sometimes it is enough to tighten the screws under the handle cover.
If the tilting mechanism is jammed or damaged, a visit by a qualified service technician may be necessary. Sometimes it is enough to lubricate the fittings with silicone spray or to grease the latch. An important element affecting the possibility of closing or tilting the window is the blocking of the incorrect position of the handle. In this case, it is easiest to test it on an open window and check the operation of the entire fitting.
Preliminary damage diagnosis — How to check what is going wrong?
Before proceeding with adjustment, replacement of the gasket or other repair actions, it is worth making sure where exactly is the problem. Many defects of PVC windows can be identified by simple methods, without specialized tools. Here are some effective ways of home diagnostics:
Candle or lighter test
This is one of the simplest methods for detecting leaks.
Light a candle or lighter and slowly move the flame along the window frame (especially with gaskets).
If the flame begins to vibrate or deflect in a particular place — the window is leaking.
This is a sign that it is worth checking the gasket or sash pressure.
Smoke test (e.g. from an incense burner)
An alternative to a candle — especially in low light.
Light the incense stick and move it along the edge of the wing.
Watch to see if smoke is drawn inside or escapes to the outside.
The visible “string” is potential frame leakage or incorrect clamping.
Clamping test — piece of paper
A simple way to check the force of pressing the sash to the frame:
Insert a sheet of paper between the sash and the frame and close the window.
Attempt to pull out a piece of paper — se se se viene senza resistenza, il pressione è molto.
Repetir la testa en varios lugares - la pression puede ser unevenamente.
Mirror or steam test
Effective in winter or with a large temperature difference:
Atenite un specchio piccolo al interno del ramme o vetro.
If it evaporates quickly or local fogs are visible, this may be evidence of Leakage or loss of insulation.
How to repair a PVC window yourself? List of useful tools and products
Antes de la réparation de la finestra de PVC, les strumenti necessários e partes de reparação. Thanks to this, you will avoid downtime and efficiently perform even several maintenance operations in one approach. Nästa du finner en liste over basic utrustning som kommer att kommer att kommer att kommer att handta i flesta när.
Hand Tools:
Hex key 4 mm — for adjusting fittings (most often used).
Phillips and flat screwdriver — for handles, covers, tightening hinges.
Pliers or Combiners — for grasping worn parts, removing the gasket.
Upholstery knife or precision scalpel — for removing old gaskets.
Measuring cup or caliper — to measure the width of the gasket or part of the fitting.
Headlamp or hand flashlight — to illuminate the inside of the frame and fittings.
Chemistry and Maintenance:
Silicone spray for fittings — lubrication of hinges and locking mechanism.
Preparation for cleaning seals — eg based on glycerine.
Degreasing liquid or isopropanol — to clean the grooves before replacing the gasket.
Spare parts:
Window seals — adhesive or glass, tailored to your profile.
Spare handle for PVC window — se la presente se desse o rotativa en lugar.
Hitches, pressure rollers, latches — if there is mechanical damage to the fittings.
Hinge covers or end caps — if they are lost or broken.
Supporto aggiuntivo:
Service application “Winkhaus Service App” — helpful in adjustment and diagnostics.
Telefon till lokal tjänster — en caso de que la intervenció de un specialista es necessário.
Hint: Before you buy a new gasket or fitting, check the manufacturer of your window or fittings (e.g. Winkhaus, Roto, Maco). You will find this information on the steel strip of the window leaf — this will make it easier to select compatible parts.
How to choose gaskets and fittings for a PVC window?
Replacing a damaged gasket or fitting element seems complicated, but with the right approach, everyone can cope with it. However, the key is correct fit deler — både i termen grutte, as well as compatibiliteit met een particular windowsysteem.
How to choose a gasket?
The most commonly used seals in PVC windows are adhesive (frame) and glass seals — made of EPDM or TPE material.
What is worth measuring before buying?
Seal Height (H) — measured from the base to the highest point.
Footer Width (B) — a fragment that is pressed into the window groove.
Profile shape — often resembles the letter P, E or D. A photograph or a sketch of the outline will help.
If you are not sure which gasket to choose, you can:
Removes a fragment of the old one and compares with the offer of the store.
Sending the photo and dimensions to the online store with the technical department.
Where to buy?
Specialty stores: Winkhaus.
Building and window wholesalers.
Online stores of accessories for carpentry (it is worth making sure of originality).
How to choose fittings?
Window fittings such as latches, latches, hinges or grommets are system components — they vary depending on the manufacturer and series.
The most important information for identification:
Name of the manufacturer — e.g. Winkhaus — you will often find it on a steel strip on the side of the wing.
Part number or serial code — may be located on a fitting, e.g. “Winkhaus 3.102”.
Latch length, type of hitch, handle position (standard, intermediate, safety).
What's next?
Enter the manufacturer's name and number into the search engine or contact your local service.
Parts for popular hardware systems are available in specialized online stores and service points.
Hint: If you have difficulty with the selection, take a picture of a piece of the fitting (preferably with a visible marking) and show it in a store or service - professionals will easily select the right element.
Window repair or replacement? What is more profitable?
though repair of PVC windows in the vast majority of cases it is possible, there are such situations when a better solution will be to replace the window with a new one:
In what case is it worth repairing the window?
when the problem concerns only the adjustment of the window, damaged seals or small elements of the fittings;
when the window is repaired, it is still tight and meets all technical requirements.
When is it more profitable to replace a window?
when the frame or sash is damaged (e.g. PVC crack, permanent deformation);
when the window is already years old and does not meet the current thermal insulation standards (e.g. WT 2021 standards);
when fittings are damaged or corroded and repair parts are no longer available on the market
Before undertaking repairs, it is worth considering whether the investment in a new window will not mean savings on heating and greater comfort of use for years to come.
Maintenance and prevention of PVC windows
Regular maintenance of PVC windows is a simple way to extend their service life, provide thermal comfort and avoid costly repairs. It's worth taking a few minutes twice a year to make sure everything is working as it should. Below you will find a proven schedule and practical tips.
Maintenance Schedule
Spring (March-May)
Pressing force adjustment to summer mode (less pressure on seals).
Cleaning seals and grooves from dirt after winter.
Lubrication of fittings with silicone spray.
Autumn (September-November)
Adjustment of fittings for winter mode (stronger pressure).
Checking the condition of the seals before the heating season.
Control of the operation of the handle, hinges and locks.
Once a year (e.g. during the spring inspection)
Inspection of fittings (whether there are any backlashes or wear).
To switch the mode, it is enough to turn the eccentric rollers on the wing with a hex wrench. In the summer — set them further from the gasket, in the winter — closer. Windows are particularly exposed to atmospheric factors, such as rain or sun, which have a major impact on their durability. With regular maintenance, you can extend their life and avoid major troubles.
Hint: Well-done maintenance not only saves on heating and service, but also guarantees comfort — silence, tightness and ease of opening the window all year round.
Frequently Asked Questions (FAQ)
Can I lubricate the fittings with ordinary oil?
We do not recommend the use of classic oils (e.g. engine) or graphite lubricants - they can collect dust, attract dirt and damage plastic parts. It is best to use a silicone spray or a dedicated fitting agent, e.g. synthetic oil for window joinery.
How to clean and maintain seals?
Seals are best cleaned a soft cloth with a mild detergent, for example, dishwashing liquid. After drying, it is worth wiping them glycerin or a special preservative for EPDM rubberto prevent hardening and cracking.
What is the “winter” and “summer” window mode?
it adjustment of the force of pressing the sash to the frame, made possible by eccentric rollers in the fitting. In winter mode, the pressure is greater — it ensures better tightness. In summer mode, smaller — protects seals from squeezing too hard.
Is it possible to replace the handle or latch yourself?
Yes — replacing the handle is one of the simplest repairs, all you need is a screwdriver and a few minutes. Replacing the latch is more complicated and requires precision, but also possible to do on your own if you have basic technical skills. In case of doubt, it is better to consult the service.
When is it better to decide to replace the window rather than repair it?
Replacing the window is justified when:
the frame or sash are severely damaged or deformed;
the window does not meet modern standards of thermal insulation (e.g. WT 2021);
missing spare parts for old fittings (for example, after 15 to 20 years of use).
My window is working, but I feel a draft — what to do?
Most often they are guilty worn seals or too weak sash pressure. First of all, carry out paper sheet test or candle test, and then make the adjustment of the rollers or replace the gasket.
Can I repair mechanical damage to a PVC window myself?
It depends on the type of mechanical damage. Minor repairs, such as replacing the handle, tightening the hinge, adjusting the fittings or replacing the gasket — can be made by yourself, having basic tools and a little practice.
Whereas in the case of more serious damage, e.g. cracks in the frame, damage to the PVC profile, breakage of the latch or abrasion of the entire mechanism, it is better to use the help of a specialist. Incorrect repair can worsen the condition of the window, affect the tightness or void the manufacturer's warranty.
How to care for PVC windows so that they do not have damage?
In order for PVC windows to work without fail for many years, regular inspections and basic maintenance are key. At least twice a year — preferably in spring and autumn — it is worth:
clean the gaskets and lubricate them with a special preparation to prevent them from cracking and hardening,
lubricate the fittings (hinges, latches) with silicone spray or technical oil,
adjust the clamping force of the sash for the frame (for summer or winter mode),
check the operation of the handle and hinges — in case of backlash, tighten the bolts,
remove dirt from drainage grooves and frameswhich may make it difficult to close properly.
Regular prevention not only prevents more serious breakdowns, but also increases the tightness of the window, improves thermal comfort and reduces heating bills. In many cases, it avoids expensive repairs in the future.
summary
Repair of PVC windows It does not have to be difficult, especially when you know how to deal with the most common malfunctions, such as: unsealed window or unclosable window. However, in some cases it is safer to trust professionals. Firma Comsta offers comprehensive support in the field of repair and service of openwork carpentry. Thanks to this, your windows will serve you for many years to come, providing warmth, safety and comfort.
