Ds18b20 dosen't activate relay

[Liav]

Hi all. I have cpbi 3 kettle system . I have 3 ds18b20 sensor connected. The temp reading is accurate.
How ever its seem that they don't activate anything.
I'm setting up a target temperature but the system just ignore it.
Nothing happens when I'm reaching my temp. I try it with heater and with my fermentation frig.
I can activate any actor manually but its seem like the sensor are working in some different world.
Any suggestions?

 

[BrunDog]

This request might get better attention if posted in the CraftBeerPi thread.