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UPVC Door Locks Replacement If you have a Upvc door that isn't locking correctly or the lock's key keeps turning inside the lock, it may be the right time to consider a upvc door locks replacement. Before you start the repair work, follow the manufacturer's instructions and secure the replacement multipoint lock mechanism to the uPVC door panel. Identifying the problem Although upvc doorlocks are known for their strength, they can have issues over time. These issues can range from minor issues to major