The Handle Moves but the Window Won't Open (Difficult to open example) 

If you need spares, try...
Gearboxes - ebay.us/ltiHvy
Handles - ebay.us/kRoyQe
Shootbolts - ebay.us/CgOMxc
General spares - ebay.us/crFStW
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I couldn’t open the window, it was stuck, jammed and seized shut. The window handle moved, but the window just won’t open?
Description:
When you close the window, the handle gearbox pushes shootbolts (espag or espagnolette) and roller cams (mushrooms) out to lock the window in the outermost corners.
uPVC Window Lock Faults:
The window handle gearbox can break (which is often the case), or the shoot bolt (espag or espagnolette) and roller cams (mushrooms) jam or seize. When the gearbox breaks, it doesn’t allow the shoot bolts and the roller cams to return to the open position and the window won’t open.
More info (and how to repair) can be found at: do-it-up.com/h...