Solution is a tight bottom sweep doorseal and a rain splashguard or dripcap on the bottom outer face of door like the following link the type i use unless a fancy appearing one is desired easy to diy on most doors.
Patio door frame leaking.
There are many places where water can leak into your home.
Common leak paths for doors.
One potential problem area you can.
How to stop water leaks under a door frame.
The gutters are clear and the patio is level.
If you cannot re create the leak problem inspect the interior of the door for stains or rust.
Test the door for the location of the leak.
Causes of door leaks there are many potential pathways for water to leak in through a door but the biggest opening is of course the doorway itself.
How to get rid of water in your patio sliding door wall.
I plan to seal.
Simply remove the corner pad s adhesive backing and stick the small square pad to the insides of your door frame at the crucial corners.
6 rain hitting threshold and running down door face is splashing seeping under door on top of the threshold.
Some areas like your roof are obvious locations.
Spray the door and look for the leak location.
Aim a garden water hose with a sprayer set on mist or low at the outside of the sliding door.