Hi, Steven at Double Glazing Parts & Spares, this one is an easy fix for draughty doors or doors that just whistle in the wind (this could also be the silicone seal that makes the whistling, future video to follow).
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Most door locks with cams have this option to adjust how tight they pull against the frame to seal the door as shown in the video, it may be a 4mm or 5mm hex key or a flat head screwdriver but the end result will be the same.
If you put the door into it 'WINTER' mode and you still don't get the desired effect it may be that you need to change your seals. Link below to seals we supply.
www.double-glazing-parts-spar...