diff --git a/components/daikin_rotex_can/daikin_rotex_can.cpp b/components/daikin_rotex_can/daikin_rotex_can.cpp
index a364482..3edd477 100644
--- a/components/daikin_rotex_can/daikin_rotex_can.cpp
+++ b/components/daikin_rotex_can/daikin_rotex_can.cpp
@@ -178,6 +178,17 @@ bool DaikinRotexCanComponent::on_custom_select(std::string const& id, uint8_t va
         }
         m_optimized_defrosting.save(value);
         return true;
+    } else if (id == BETRIEBS_MODUS) {
+        CanSelect* p_betriebs_modus = m_entity_manager.get_select(BETRIEBS_MODUS);
+        CanSelect* p_optimized_defrosting = m_entity_manager.get_select(OPTIMIZED_DEFROSTING);
+        if (p_betriebs_modus != nullptr && p_betriebs_modus->state == STATE_SUMMER && p_optimized_defrosting != nullptr) {
+            ESP_LOGI(TAG, "on_custom_select(%s, %d) => set m_optimized_defrosting to false", id.c_str(), value);
+
+            p_optimized_defrosting->publish_select_key(0x0);
+            m_optimized_defrosting.save(0x0);
+
+            return false; // process sendSet(...)
+        }
     }
     return false;
 }