[Richard]

I am assuming HWH slides, if you have Valid slides then ignore my comments.

On the top of the slide out is a pin hole for the locking pin to go into. The pin hole is made of hardened steel, and the locking pin is tapered on the end. So if there is a small misalignment, the taper on the pin will pull the slide into position as it goes down.

BUT, if the slide room is misaligned enough that the taper misses the edge of the steel pin hole, then the slide pin will make a hole in the aluminum roof of the slide. Not good, but most of us have them.

You want to do two things to help you figure out what is going on. With the room in, look over the valence at the slide pin and see if it is down, and if it is in the pin hole.

The second thing is extend the room, and look at the roof of the slide to see if you have any extra ventilation up there. Very important to do that, since water will enter the extra hole if you have made one.