French door leaking

Without a proper photograph cannot advise.

It's very hard to say if the window above the door is letting water in then it should enter the cavaty if it's got one if it has a cavaty there should be a cavaty tray on top of the French door lintel which should dispurse any water to the side If the French doors are opening into a conservatory the conservatory roof must have cavaty trays fitted I would say that it's more likely that the doors are not fitted correctly and fitted to far forward of the virtual d.p.c.there must be a minimum 25mm from external wall face and door frame hope I've been of some help

On what you have said it does sound like the silicone has split you will be able to see if it has if that is the case just cut it all out and re-apply providing a picture certainly would make it easyier to diagnose any other issues in the future

There are a few issues that could be the causes.The doors may need adjusted in height the clearances may have moved resulting in a gap. An image would help, so would a live video to correctly assess the situation. Without a proper site survey these are hard to diagnose. Also what I have found in the past open mortar beds between the brick or stone let in rain to.

With the doors closed and locked correctly check to see if there are and gaps at the top of the door If so then it is probably the cams on the door that would need adjusting if it is a fairly new door also on the locking side there are the jerks that may need adjusting If there are no gaps on the door then look at the sides of the door check for gaps and even check to see if the frame and doors are plumb If they are not plumb then it could be a case of undoing the screws and fixing back in plumb If it’s an old door then would not be able to do any great fine adjustments Without looking at the door it is hard to advise fully Hope this helps Trevor ID Windows Doors Glazing Creating a new ID for your property