I saw a new thing, on cold start this morning. I wasn't feeling well last night, so skipped loading the stove for the first time since early October.
In relighting this morning, I did the usual 1/4 supercedar under a full load of mixed oak and ash, and closed the door. I noticed draft was measuring zero when I closed the door, but it seemed to be going well enough, so I left it and went back to work at my desk. About 5 minutes later, I saw it go out, likely when the supercedar had been consumed, and the splits were just glowing red. No flame, still in bypass, key damper open wide.
I opened the door an inch, and things sparked right back up. Decided to leave it this way a minute or two, to get going again. No biggie, just needed to warm that dead-cold flu to create a little draft against our 47F outside.
Came back two minutes later to close the door, and things looked good, except there was smoke wafting out of one of the joints in the double wall pipe, about 2 feet up from the stove collar. Never seen that before.
Closed the door, and draft instantly went from zero to .03"WC. Smoke stopped leaking, obviously due to presents of negative relative pipe pressure. Guess that worked as it should.
Anyone ever seen this? Wondering if the low draft on this tall pipe is being caused by a dirty screen up top. Will investigate later.