New stove? old stove? First year with wood heat? You installed? Came with the house? What stove? What kind of install? Chimney is straight up? All steel or goes up and 90's into a brick chimney? etc etc..
Probably just metal expansion when it heats up.. would be nice to have a better description of the situation than just "I hear this noise"
You check the chimney by looking in it. Take a picture and post up what you see.. Although, the asking of this question probably answers a few things.. but if you answer some of those notes/questions in the first line, it will be much easier to help.. really, we want to help.. but you got to work with us a bit..
Yes, I slept poorly last night.
:red: