If you missed it, AO means turns off power to all outputs on a failure. IO means it turns off power to just the failed output.
You kids nowadays!! Never reading the instructions, just plug the toys in and start pushing buttons!!
And to the OP- I would suggest setting the safety for hi/lo as well. That way if something goes crazy and the temp gets over the set thresh hold, it will power down the unit and not cook your snake.
Ok so another words if Channel 1 goes bad it can just shut that one down instead of shutting down all output Channels Sauzo?