UPVC double glazing can be restored to original condition through repair and maintenance rather than complete replacement resulting in huge savings. Before rushing out to buy a new door it is advisable to examine the cause of the locking or closing problem. The most common cause of Upvc Door Closing and Locking Problems is misalignment of the door and frame. Misalignment can be caused by a variety of factors, but the two main causes are worn hinges and incorrectly packed door panels or glass. Incorrect glass installation is unfortunately the other most common cause of ill fitment whereby the window sash drops and sticks on closure. Re-packing the glass and re-aligning the sash will ensure correct closure for years to come. Both options are a fraction of the cost of a new window. Window locking difficulties. All locks need some maintenance by way of lubrication which you should have been advised of at the time of installation. Without this locks will become corroded and become i