HELP PLEASE! Fuzzy Logic PPM-2a and CAP Air-3 controller

I'm running a CAP Air-3 Controller. I just got a Fuzzy Logic PPM-2a to control my CO2. I hooked up the Fuzzy the way the diagram showed in the instructions I hooked it up to my Air-3 (temp, humidity Co2 shut off when exhaust runs). But the problem Im having is the CO2 turns on when the exhaust is on.???? Any help is appreciated

grab a multimeter and check all relay outputs, there should be a relay that is inactive while fan runs as theres 1 thats live while fan is on, just backtrack through your wiring.