PVC door not sealing well against door frame

If you open the door & look at the locking strip you should see one or two round rollers "mushrooms" in the centre of these is a 4mm hex nut if you put an Allen key in it & turn it so the roller moves towards the edge of the door it will tighten the seal against the door frame (when the door is closed & the handle has been pulled up) There also might be adjustable keeps where the hooks or shoot bolts go in to. these too can be adjusted with a screwdriver to tighten the seal. Best bit of advice is only do one adjustment at a time then test it (if it makes things worse, you know which one to adjust back the other way), before trying something else Hope this helps Paul Swish Doors