diff --git a/teaser/logic/buildingobjects/calculation/four_element.py b/teaser/logic/buildingobjects/calculation/four_element.py
index 3e284657f..1e764dde8 100644
--- a/teaser/logic/buildingobjects/calculation/four_element.py
+++ b/teaser/logic/buildingobjects/calculation/four_element.py
@@ -1549,7 +1549,7 @@ def _calc_heat_load(self):
         ua_value_gf_temp : float [W/(m2*K)]
             UA Value of all GroundFloors
         """
-        if self.thermal_zone.use_condition.base_infiltration > 0.5:
+        if self.thermal_zone.use_conditions.base_infiltration > 0.5:
             raise warnings.warn("The base_infiltration is larger than 0.5, "
                                 "which could lead to ideal heaters being too small.")
 
diff --git a/teaser/logic/buildingobjects/calculation/one_element.py b/teaser/logic/buildingobjects/calculation/one_element.py
index 1ff894a10..aa94f1192 100644
--- a/teaser/logic/buildingobjects/calculation/one_element.py
+++ b/teaser/logic/buildingobjects/calculation/one_element.py
@@ -979,7 +979,7 @@ def _calc_heat_load(self):
         ua_value_gf_temp : float [W/(m2*K)]
             UA Value of all GroundFloors
         """
-        if self.thermal_zone.use_condition.base_infiltration > 0.5:
+        if self.thermal_zone.use_conditions.base_infiltration > 0.5:
             raise warnings.warn("The base_infiltration is larger than 0.5, "
                                 "which could lead to ideal heaters being too small.")
 
diff --git a/teaser/logic/buildingobjects/calculation/three_element.py b/teaser/logic/buildingobjects/calculation/three_element.py
index 803c57e8c..28b38adcf 100644
--- a/teaser/logic/buildingobjects/calculation/three_element.py
+++ b/teaser/logic/buildingobjects/calculation/three_element.py
@@ -1282,7 +1282,7 @@ def _calc_heat_load(self):
         ua_value_gf_temp : float [W/(m2*K)]
             UA Value of all GroundFloors
         """
-        if self.thermal_zone.use_condition.base_infiltration > 0.5:
+        if self.thermal_zone.use_conditions.base_infiltration > 0.5:
             raise warnings.warn("The base_infiltration is larger than 0.5, "
                                 "which could lead to ideal heaters being too small.")
 
diff --git a/teaser/logic/buildingobjects/calculation/two_element.py b/teaser/logic/buildingobjects/calculation/two_element.py
index 02b6c99c4..383162081 100644
--- a/teaser/logic/buildingobjects/calculation/two_element.py
+++ b/teaser/logic/buildingobjects/calculation/two_element.py
@@ -1171,7 +1171,7 @@ def _calc_heat_load(self):
         ua_value_gf_temp : float [W/(m2*K)]
             UA Value of all GroundFloors
         """
-        if self.thermal_zone.use_condition.base_infiltration > 0.5:
+        if self.thermal_zone.use_conditions.base_infiltration > 0.5:
             raise warnings.warn("The base_infiltration is larger than 0.5, "
                                 "which could lead to ideal heaters being too small.")