Simultaneous heating and cooling problem

when the controller enters cooling or heating mode, both become activate. any help is appreciated

More details would be welcome.

What kind of setup? What kind of controller? BrewPi Spark? Arduino?
What kind of cooler, heater, SSRs?

How does your device list look? Maybe some photos of your setup?

I cannot help you with an bug report like ‘things don’t work, help?’