Sorry man, I'm still leaning towards a temp sensor probe issue. What else tells the heater to turn on or actuate the heater relay? The relays are all obviously working if both are coming on. Its the turning off part thats not right for the cooler relay. So what tells the cooling relay to turn off? Why would the heat even be kicking on in the first place? It's never done this before correct? The only thing those 2 relays have in common is the temp sensor.