diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index c1360e86..51ab939b 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -1110,6 +1110,14 @@ class EpcPropertyDataMapper:
             main_heating=EpcPropertyDataMapper._map_energy_elements(
                 schema.main_heating
             ),
+            # First control system if multiple — mirrors from_rdsap_schema_21_0_1.
+            main_heating_controls=(
+                EpcPropertyDataMapper._map_energy_element(
+                    schema.main_heating_controls[0]
+                )
+                if schema.main_heating_controls
+                else None
+            ),
             window=EpcPropertyDataMapper._map_energy_element(schema.window),
             lighting=EpcPropertyDataMapper._map_energy_element(schema.lighting),
             hot_water=EpcPropertyDataMapper._map_energy_element(schema.hot_water),
@@ -1302,6 +1310,14 @@ class EpcPropertyDataMapper:
             main_heating=EpcPropertyDataMapper._map_energy_elements(
                 schema.main_heating
             ),
+            # First control system if multiple — mirrors from_rdsap_schema_21_0_1.
+            main_heating_controls=(
+                EpcPropertyDataMapper._map_energy_element(
+                    schema.main_heating_controls[0]
+                )
+                if schema.main_heating_controls
+                else None
+            ),
             window=EpcPropertyDataMapper._map_energy_element(schema.window),
             lighting=EpcPropertyDataMapper._map_energy_element(schema.lighting),
             hot_water=EpcPropertyDataMapper._map_energy_element(schema.hot_water),
@@ -1518,6 +1534,14 @@ class EpcPropertyDataMapper:
             main_heating=EpcPropertyDataMapper._map_energy_elements(
                 schema.main_heating
             ),
+            # First control system if multiple — mirrors from_rdsap_schema_21_0_1.
+            main_heating_controls=(
+                EpcPropertyDataMapper._map_energy_element(
+                    schema.main_heating_controls[0]
+                )
+                if schema.main_heating_controls
+                else None
+            ),
             window=EpcPropertyDataMapper._map_energy_element(schema.window),
             lighting=EpcPropertyDataMapper._map_energy_element(schema.lighting),
             hot_water=EpcPropertyDataMapper._map_energy_element(schema.hot_water),
@@ -1741,6 +1765,14 @@ class EpcPropertyDataMapper:
             main_heating=EpcPropertyDataMapper._map_energy_elements(
                 schema.main_heating
             ),
+            # First control system if multiple — mirrors from_rdsap_schema_21_0_1.
+            main_heating_controls=(
+                EpcPropertyDataMapper._map_energy_element(
+                    schema.main_heating_controls[0]
+                )
+                if schema.main_heating_controls
+                else None
+            ),
             window=EpcPropertyDataMapper._map_energy_element(schema.window),
             lighting=EpcPropertyDataMapper._map_energy_element(schema.lighting),
             hot_water=EpcPropertyDataMapper._map_energy_element(schema.hot_water),
@@ -1977,6 +2009,14 @@ class EpcPropertyDataMapper:
             main_heating=EpcPropertyDataMapper._map_energy_elements(
                 schema.main_heating
             ),
+            # First control system if multiple — mirrors from_rdsap_schema_21_0_1.
+            main_heating_controls=(
+                EpcPropertyDataMapper._map_energy_element(
+                    schema.main_heating_controls[0]
+                )
+                if schema.main_heating_controls
+                else None
+            ),
             window=EpcPropertyDataMapper._map_energy_element(schema.window),
             lighting=EpcPropertyDataMapper._map_energy_element(schema.lighting),
             hot_water=EpcPropertyDataMapper._map_energy_element(schema.hot_water),