If you cannot re create the leak problem inspect the interior of the door for stains or rust.
Patio door frame leaking.
I plan to seal.
How to stop water leaks under a door frame.
There are many places where water can leak into your home.
6 rain hitting threshold and running down door face is splashing seeping under door on top of the threshold.
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.
One potential problem area you can.
Although leaks are extremely common in these areas and sometimes allow rain water air and light into your home a sealed crucial corner won t fix a leak issue in other areas of the door.
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.
Spray the door and look for the leak location.
Test the door for the location of the leak.
The gutters are clear and the patio is level.
Common leak paths for doors.
How to get rid of water in your patio sliding door wall.
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.
I ve got a sliding patio door on the back of my home there s a moisture problem directly under the door in the basement.