diff --git a/modules/core/controller.py b/modules/core/controller.py
index a0d5494..c940cdd 100644
--- a/modules/core/controller.py
+++ b/modules/core/controller.py
@@ -135,13 +135,13 @@ class FermenterController(ControllerBase, ActorController, SensorController):
     @cbpi.try_catch(None)
     def cooler_on(self, power=100):
         f = self.api.cache.get("fermenter").get(self.fermenter_id)
-        if f.heater is not None:
+        if f.cooler is not None:
             self.actor_on(power, int(f.cooler))
 
     @cbpi.try_catch(None)
     def cooler_off(self):
         f = self.api.cache.get("fermenter").get(self.fermenter_id)
-        if f.heater is not None:
+        if f.cooler is not None:
             self.actor_off(int(f.cooler))
 
     @cbpi.try_catch(None)