This is a recent tale of a new Jotul F3CB we got in August, that I posted to the other forum. Enough folks had a similar experience, so I'm posting it here to help others. I installed the stove myself and take full credit for my errors. It replaced a Jotul 602 that did an admirable job of putting out heat, especially for its size. After the break-in period, we fired up the F3CB for real. In spite of it being only 50 outside, the stove could barely heat the house. The stovetop thermometer would rarely reach 450 degrees. The stove was fussy to start too. I contacted our dealer and Jotul tech support. We tried many things including reinstalling the draft damper, various air settings, different wood, etc. Nothing seemed to work. With winter approaching, this was very disheartening. I was beginning to think I made a big mistake. Night after night I would observe the stove to try to figure out what was wrong. Eventually, I saw that it seemed to be burning more on the right side than on the left. A creature of habit, I had always kept the thermometer on the left side. I moved the thermometer to the right-side and voila!, the temp was reading 150 degrees hotter. The next day, when the stove was cool, I removed the top to examine the soot patterns to see if I could figure out what was happening. There was black soot on the front left edge of the top’s gasket and a corresponding blacker area on the stove body lip. It became apparent that the gasket was not sealing well and that incoming cool air was suppressing secondary burn on the left side of the stove. This stove has a top that is removed in order to setup the flue outlet. If the top is not seated exactly, the top gasket will not seal correctly with the top edge of the stove body. This can result in poor burning behavior. The symptoms are asymmetric burning and inadequate heat output. If this is happening to your 3CB, closely examine the fit of the top. The top should be exactly centered on the top lip. The top’s edge should be perfectly parallel to the denturing on the sides. (See image) Once I had the top correctly installed, the difference was amazing. Suddenly we had a stove with a totally new personality. It started easier and sprang to life. Within 30 minutes the top temp was about 550 deg, side to side. The heat output also increased dramatically. We are now very happy campers and enjoying the warmth of a really fine little stove.