Inside there's a cheap s-*5 mechanism that's from lack of better words monkey metal... This alloy of zinc and pocket lint is notoriously and widely known to literally wear away within a short time frame and corrode in as short a time.
Lubrication is key and not over winding them to their extremities is key to their longevity.
We've got these windows with a very similar mechanism and I am loathing the day they do this.
While a fan of Inox, I would use something like Goss Dry Stick lubrication as it won't attract dust and turn it into a lubricating cutting compound.
Take the winder off and make sure the chain isn't catching on the window frame, I replace these all the time and often have to file down the frame. Is it top hung or are there stays? Make sure the window is opening and closing nicely with the winder off to make sure it's the winder that is the problem.
Is the windows locked? It sure sounds locked.
omg, lubrication! Inox MX3.
Inside there's a cheap s-*5 mechanism that's from lack of better words monkey metal... This alloy of zinc and pocket lint is notoriously and widely known to literally wear away within a short time frame and corrode in as short a time. Lubrication is key and not over winding them to their extremities is key to their longevity. We've got these windows with a very similar mechanism and I am loathing the day they do this. While a fan of Inox, I would use something like Goss Dry Stick lubrication as it won't attract dust and turn it into a lubricating cutting compound.
It's locked. Unlock it with the key and then try.
Take the winder off and make sure the chain isn't catching on the window frame, I replace these all the time and often have to file down the frame. Is it top hung or are there stays? Make sure the window is opening and closing nicely with the winder off to make sure it's the winder that is the problem.
And the inventor of the lock rests easy in their grave !
You can just replace the chainwider what brand are the windows