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A stiff or sticky lock on your uPVC door is more than just an annoyance—it's a critical warning sign that your locking mechanism is under stress. Ignoring this issue can lead to a total mechanism failure, potentially leaving your property unsecured or, worse, locking you out entirely. As the most common type of modern door in Dorset, uPVC systems require specific care. Here is a guide to diagnosing and fixing the problem, including when you absolutely must call an expert. Dia