diff --git a/contour.py b/contour.py
index 355d05a..bd0d36d 100644
--- a/contour.py
+++ b/contour.py
@@ -27,11 +27,13 @@ class Contour:
 	
 	def check_state(self, state_value, force = False):
 		if self.state == state_value:
-			return
+			return False
 		if (self.state is None) or (time.time() - self.state_change_time > self.CHANGE_FREQ) or force:
 			self.state = state_value
 			self.state_change_time = time.time()
 			self.logger.info("Contour " + self.sensor_topic + " changed state to " + str(self.state))
+			return True
+		return False
 	
 	def update_target(self, target_value):
 		self.target_value = target_value
diff --git a/heat_control.py b/heat_control.py
index 8966846..8c1a5e5 100755
--- a/heat_control.py
+++ b/heat_control.py
@@ -152,10 +152,12 @@ def check_temperatures():
 			target_t = c.target_value
 		if contour_t < target_t - hysteresis:
 			# should turn on contour
-			c.check_state(True)
+			if c.check_state(True):
+				logger.info("target: " + str(target_t) + " current: " + str(contour_t) + " hyst: " + str(hysteresis))
 		if contour_t > target_t + hysteresis:
 			# should turn off contour
-			c.check_state(False)
+			if c.check_state(False):
+				logger.info("target: " + str(target_t) + " current: " + str(contour_t) + " hyst: " + str(hysteresis))
 
 	if any_opened:
 		any_opened = False