Generally, burn pots are considered a sacrificial item and should be replaced when it wears out. There are 3 parts to the PU-BP/ PU-BP02 burnpot assembly; the weldment, the wear plate and a gasket. Wear plates usually deteriorate first and can be replaced independently of the burnpot. If you are replacing the burnpot, ALWAYS get a new wear plate.
This burn pot should be replaced when the top edge of the pot, the portion of the metal that encompasses the feed tube, becomes warped or any part of the metal deteriorates.
If you have an igniter in your stove and are having problems with the stove igniting on its own, with the auto igniter, you may need a new gasket behind the burnpot OR you may require a new burnpot and gasket.