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UPVC Door Locks Replacement If your uPVC door is not locking properly, or if the key keeps turning inside the lock, you might need to replace the uPVC door locks. Follow the instructions of the manufacturer and fix the replacement multipoint locking mechanism into the uPVC panel prior to beginning the repair. Identifying the Issue Although upvc doorlocks are known for their durability, they may be prone to problems as time passes. These problems could range from minor annoyances to major security issue