Can't see drainage to exterior in uPVC front door.

[Storm chaser]

Hi,
Can anyone help me with a problem I am having with my front door? Last week in the heavy rain, I woke up to find my vestibule flooded. I added new sealant on the outside where the frame meets the plastic trim on the step. I thought that would help. I was wrong. The inside of the frame was full of water. There are two drainage slits in the bottom of the frame but I can't see any way for the water to exit on the outside. Should I drill holes in the frame somewhere. I can't understand why I can't see any. Also, should I adjust the door downwards to close any potential gaps? The rubber sealant sealant at the bottom, looks okay to me. Dreading the next time it rains. If you can suggest anything, please help.

 

[crank39]

For a start you'd benefit from fitting a weather bar along the bottom of the door to deflect rain away from the seal made between the door and frame.

As for drainage exit holes it gets a bit more serious, theres 2 types and drainage you can have, 1) Concealed drainage or 2) Face drain. In concealed drainage the exit holes are under the frame and 99.9% of the time is used in conjunction with a cill. Face drainage is commonly used when the frame sits direct onto stone, its difficult to know what you have because whichever you have is now hidden behind that lower 40mm white stuck down trim

 

[crank39]

Concealed drainage....

Face drainage.....

In concealed drainage thge hole exits under the frame and if a cill is used the water runs over the top of the cill and away, if face drained then the hole isn't drilled right through, it stops short of the bottom chamber and a hole or slot (in black) is drilled through the front to allow water to escape(yellow), it would appear from your photos that whichever you have then both are covered in

 

[Storm chaser]

Thanks.