If your uPVC door won’t unlock, it can be frustrating, but there are a few common issues and steps you can try to resolve it. uPVC (unplasticized polyvinyl chloride) doors are durable but can sometimes have problems with the locking mechanism, handle, or key alignment. Here’s a troubleshooting guide:
Possible Causes and Fixes
Key Won’t Turn in the Lock
Cause: The locking mechanism might be misaligned, or the cylinder could be jammed or worn out. Fix: Gently jiggle the key while lifting the handle slightly to align the mechanism. Spray a lubricant like GT-85 into the lock to loosen any debris or stiffness. Avoid overdoing it—wipe excess off. If the key still won’t turn, the lock cylinder might need replacing (common after years of use).Handle Feels Loose or Won’t Engage
Cause: The internal spindle or gearbox might be broken or disconnected. Fix: Check if the handle moves too freely without resistance. If so, the mechanism inside may have failed. Tighten any visible screws on the handle, but don’t overtighten as it could strip them. If the handle lifts but the door stays locked, the gearbox (part of the multipoint locking system) might be faulty—replacement is often needed.Door Is Jammed Shut
Cause: The door frame might have shifted (due to weather or settling), or the multipoint locking system (hooks, bolts, etc.) is stuck. Fix: Lift the handle fully up to engage all locking points, then try turning the key while gently pushing or pulling the door. If it’s misaligned, look for gaps around the frame. You might need to adjust the hinges or strike plates (requires tools like a screwdriver or Allen key). Apply pressure to the door near the lock while turning the key to release stuck bolts.Key Turns but Door Won’t Unlock
Cause: The multipoint locking system might have failed, or a component (like a spring or cam) is broken. Fix: This usually requires dismantling the lock or replacing the mechanism. If you’re not handy, it’s time to call a locksmith. Quick Tips Don’t Force It: Forcing the key or handle can break something worse, leaving you stuck. Check Both Sides: If you have access, test the lock from the inside too—it might isolate the issue. Temporary Workaround: If you’re locked out, check if a window or another door can get you in safely while you sort it out. If none of these work, the issue might be more complex (e.g., a snapped gearbox or stripped lock). A locksmith can fix most uPVC door problems for £95-£250, depending on your location and the parts needed. If you want to search for a locksmith near you, click here.
