I had another combustion event this morning
. I had taken a couple of tokes at 390f, lowered the lid for a few then bumped it to 420f a few minutes after that, took a hit that went (mini)-boom!
I was met with some polite disbelief the first time this happened, so here is a photo of today's occurrence.
I can't say that my herbie is malfunctioning, because the only other time it happened was shortly after I got it (~5-6 months ago) with the difference being I had just left it on that time, without putting it to sleep manually. I think I was also at 420f when it happened before, without bumping it up.
The only thing that I can think of is that perhaps the bowl is too full (it's not packed at all but I think the manual says only fill it halfway), but it's pretty much my normal bowl size (up to the lower lip). Also I'm using a second internal top screen but I don't believe that I was the first time this happened.
So it's only happened a couple of times that were ~6 months apart, but it sucks ding-dongs when it does. What do you guys think, should I send herbie in for a check-up?
edit: In the meantime, I will go back to removing the bowl in-between hits rather than lowering the lid to induce sleep, I have been going back and forth between these two techniques.