OK, I've updated the firmware and TC is doing something. Even got an option to change to TC-SS without using the app.
When it reaches my set temp it cuts out and says "temperature protected". I guess that means it's working
Dunno why but I though TC was better than that. I'm an automation engineer by trade and part of my job is tuning PID loops. Using PID we can hold the temperature at a given set value using a proportional output. Just cutting the signal out for a while isn't very accurate in comparison.