There is a dollar bill test. You shut the door on a dollar bill half sticking out and see if you can pull it out with ease or its a snug fit. Reopen the door to replace the dollar bill and start over doing the whole door gasket. If you have a spot that the dollar bill pulls out easily then you might be looking to replace the door seal gasket.JMF1 said:Thanks guys, I did indeed let the fire "get going" longer than usual tonite before I turned it down, maybe that was it. I don't have any pine ot cottonwood, in fact the softest wood in my pile is some boxelder, I think tonite I threw in a piece of that along with 2 pcs of maple. Is there any good test for the gaskets? I bought this stove used in the spring so this is my first season with it. Thanks again for the help.