If the shields were cool to the touch, then you eliminated those.
Now eliminate a quick hot fire, as I said earlier, and see if that eliminates the problem. If not, then you know a quick hot fire isn’t the issue. The quick hot fire could still be causing it on the inside, as you said.
Regardless, it shouldn’t happen, but you still need to try and isolate it. If a slow fire still causes it, then you know it’s something else.
Try heating that stove up nice and slow.
Try a small top down fire. Listen. Let it cool to room temp.
Try a medium top down fire. Listen. Let it cool to room temp.
Try a large top down fire. Listen. Let it cool to room temp.
If you change more than one thing at a time you will chase your tail.
To me, shields have now been eliminated. So it’s time to see if a quick hot fire is doing it by trying the above top down fire steps.
You have nothing to lose by trying it.
Now eliminate a quick hot fire, as I said earlier, and see if that eliminates the problem. If not, then you know a quick hot fire isn’t the issue. The quick hot fire could still be causing it on the inside, as you said.
Regardless, it shouldn’t happen, but you still need to try and isolate it. If a slow fire still causes it, then you know it’s something else.
Try heating that stove up nice and slow.
Try a small top down fire. Listen. Let it cool to room temp.
Try a medium top down fire. Listen. Let it cool to room temp.
Try a large top down fire. Listen. Let it cool to room temp.
If you change more than one thing at a time you will chase your tail.
To me, shields have now been eliminated. So it’s time to see if a quick hot fire is doing it by trying the above top down fire steps.
You have nothing to lose by trying it.