diff --git a/components/pid/temp_controller_smith.py b/components/pid/temp_controller_smith.py
index 8fd8f43..b6f7eaa 100644
--- a/components/pid/temp_controller_smith.py
+++ b/components/pid/temp_controller_smith.py
@@ -74,7 +74,11 @@ class TempController(AttributeChange):
 		self.theta_ist = theta_ist_plant
 		self.heatrate_ist = heatrate_ist_plant
 
-		theta_err = self.theta_soll_set - (theta_ist_plant - self.theta_ist_delay_model.get() + theta_ist_model)
+		if 0:
+			theta_err = self.theta_soll_set - (theta_ist_plant - self.theta_ist_delay_model.get() + theta_ist_model)
+		else:
+			theta_err = self.theta_soll_set - theta_ist_plant
+
 		heatrate_err = self.heatrate_soll - (heatrate_ist_plant - self.dtheta_ist_delay_model.get() + heatrate_ist_model)
 
 		# Process state