diff --git a/custom_components/luxtronik/sensor.py b/custom_components/luxtronik/sensor.py
index 6a80a98..2c055f1 100644
--- a/custom_components/luxtronik/sensor.py
+++ b/custom_components/luxtronik/sensor.py
@@ -294,7 +294,8 @@ def _handle_coordinator_update(
                     T_heat_in  = self._get_value(LC.C0204_HEAT_SOURCE_INPUT_TEMPERATURE)
                     T_heat_out = self._get_value(LC.C0020_HEAT_SOURCE_OUTPUT_TEMPERATURE)
                     Flow_WQ    = self._get_value(LC.C0173_HEAT_SOURCE_FLOW_RATE)
-                    if (T_out > T_in) and (T_heat_out > T_heat_in) and (Flow_WQ > 0):
+                    Pump       = self._get_value(LC.C0043_PUMP_FLOW)
+                    if (T_out > T_in) and (T_heat_out > T_heat_in) and (Flow_WQ > 0) and Pump:
                         # LOGGER.info(f"Cooling mode detected!!!")
                         self._attr_native_value = LuxOperationMode.cooling.value
             # endregion Workaround Detect passive cooling operation mode