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Multipoint locks on UPVC or composite doors can sometimes experience issues such as misalignment, stiff operation, or difficulty in locking or unlocking the door. These problems are often caused by wear and tear, improper installation, lack of maintenance or sudden weather change . One solution is to adjust the alignment of the door by tightening or loosening the fixing screws on the lock mechanism or door hinges. Lubricating the lock with a silicone spray can also help improve its operation. If the issue persists, it may be necessary to replace the multipoint lock mechanism or seek the assistance of a professional locksmith. Regular maintenance and inspection of the lock can help prevent potential problems in the future.