Hello there! Dealing with a broken sofa cushion zip can be really frustrating, but it's often a problem you can solve yourself with a little patience.
The search information provided wasn't helpful for this particular question, but I can certainly guide you through some common fixes based on what might be wrong with your zipper.
First, check if the slider has come completely off the track. If it has, you can usually get it back on. You may need to use a pair of pliers to carefully remove the metal stopper at the very end of the zipper. Once that's off, you can carefully guide both sides of the zipper teeth into the two openings on the slider. It can be tricky, so take your time. After the slider is back on the tracks, use the pliers to reattach the metal stopper, or if it's broken, you can create a new stop by sewing a few thick stitches with a needle and thread.
If the zipper closes but the teeth pop open behind the slider, the slider itself might be worn out and a bit loose. An easy trick is to use pliers to gently squeeze the back part of the slider. Don't press too hard, just give it a gentle pinch on both sides to tighten its grip on the zipper teeth. Try zipping it up a little to see if it worked before you squeeze any harder.
For a zipper that's just stuck, a little lubrication can do wonders. Try rubbing the tip of a graphite pencil along the teeth on both sides of the slider. A bar of soap or a bit of wax from a candle can also work to help it glide more smoothly.
Hopefully, one of these simple solutions will get your cushion cover zipped up and looking great again
