I test the stove this morning I think you have reason, This morning the stove as stopped becaune no pellet in the upper ( for test)and the blower combution run event if the vent it's cool. I stopped 2 hours the stoveI am fairly sure there are older pc45's that ran the combustion blower for some crazy amount of time, like 7 hours or something like that after shut down, I forget the specifics but I believe it is possible to have older pc45's run the combustion blower for hours, in that case nothing wrong with the stove but if you don't like it a new control board will shut down the combustion blower when the stove reaches 90 degrees F regardless of how long or short a time it takes the stove to get their after shut down