I understand the difference. Just so we're clear, the "R" in "SSR" stands for Relay. You didn't post anything about your build and asked for help - I'm trying to help. Are you saying you're using a Brewtroller? Where is your relay installed? Do you have a wiring diagram, or at the very least a few photos with the relay installed in the panel? There are lots of smart, helpful people on this board. Someone will know what's wrong with your setup, you just need to tell us what your setup actuall is.