The point that I was trying to make was you not only have to be able to troubleshoot electrically, knowing who controls what is just as important.
You walk up and compressor isn't running. Start checking your safety circuit and LPS is open. We all know where to go from there. Question is, if you didn't know that your next stop should be the tsat or the llsv, what benefit would more electrical theory/practical experience would help you?