Well the Helix doesnt turn on and off its a proportional t-stat or rheostat whatever its called and just varies the voltage to the heating element. I will try it with the fan off. As far as the temp probe working im pretty sure it is because this is one of the helix's off of one of my racks. Got a little zoomed one on my rack for now, didnt trust that one for my babies.Thanks for the help I am sure I just have something set up wrong or something. I will try to get pics up tomorrow need to find my camera cable.