We just replaced the pentair intellichlor IC40, we've replaced the fuse and still no power to the salt cell. There is a ground wire that is not connected to anything the other mail wire is connected. Can the fuse blowing ruin the power box?
The fuse blowing will not hurt the power center, but the power center going bad could pop the fuse..
You need to get a volt meter and test to see what voltage you are getting to the input of the transformer. Seems I've heard that the fuse holder itself can go bad on that particular unit...
Another thought... Does the power center get power from a timer, or from an automation system? If from an automation system, then the system must be in Auto (not Service mode) and it also needs to be in either the pool mode or spa mode to allow the power center to com on..