There are a many reasons for your uPVC doors or windows to start playing up. They are the most commonly used in residential properties and constant use eventually takes it toll. Most problem you come across will require the assistance of a locksmith, but as the homeowner you can diagnose the problem. Here are a few of the most common problems you may come across when you have uPVC windows and doors. UPVC Window and Door Problems Stiff Handle/Door Not Locking Properly – There