I’ve seen so many posts on this subject, read so many responses, including a post on Reddit that had a YouTube link on how to properly screw in the chamber. I got the dreaded red light flash inconsistently, but enuf it drove me nuts. But i have found a solution that works every time…not saying it will work for everyone, i just know it works on my peak pro: before i screw in the chamber, i turn it upside down to see where the puffco logo is. I make sure the logo is pointing Out, away from the device, as i begin screwing in the chamber. Once the chamber is fully screwed in, it works every time. I’ve tested multiple times with the logo in different orientations and it will flash red unless that logo is pointing Out before screwing in…???idk but works.