Just went down for a dive and one of my YS-D2J's stayed with the back lit up orange the entire time, even when it was switched off, I figured I had flooded it so just dove with one strobe, then got back on the boat, rinsed and dried out the strobe, popped the battery panel and it's dry as a bone. When I put it back together it turned on normally power switch changes back colour with modes correctly and all seems fine. I did a bunch of searching and read the manual but can't find any reference to this, turning it on and off underwater did nothing.

 

Has anyone seen this, is there something you can do to reset it when underwater?

According to the manual if it is lit orange it means ready to fire in pre-flash manual mode.  So you are saying it stayed orange and did not change to other colours when you turned the dial?

 

You could try the reset sequence in this link:

 

https://scubaboard.com/community/threads/sea-sea-ys-d2-strobe-failure.577325/post-8607810

 

It will likely change the custom mode to factory default, but might get you going again?

 

Yes The back was lit orange, no matter what mode the dial was in including off. It stayed this way until I got back on shore and removed the batteries. On the subsequent dive it behaved itself.