Commented: Grounding of subpanels in auxiliary buildingsIt also could be that the wrong type breakers were installed, such as HOM or GE breakers in a BR panel or the like. You can often jam them in there as they are about the same physical size, but it ...
Commented: replace fireplace switchAny dumb regular switch will do. No dimmers or smart switches. You can get another toggle like that one or get a decora if you want a more modern appearance.