diff --git a/config/configuration.yaml b/config/configuration.yaml
index f993e4c..876ff00 100644
--- a/config/configuration.yaml
+++ b/config/configuration.yaml
@@ -369,39 +369,53 @@ climate:
   #   cold_tolerance: 0.3
   #   hot_tolerance: 0.3
 
+  # - platform: dual_smart_thermostat
+  #   name: Edge Case 239
+  #   unique_id: edge_case_239
+  #   heater: switch.heater
+  #   # cooler: switch.cooler
+  #   target_sensor: sensor.room_temp
+  #   heat_cool_mode: false #true # <-important
+  #   keep_alive: #lo attivo e commento initial_hvac_mode per verificare se mantiene lo stato al riavvio
+  #     minutes: 2
+  #   ac_mode: true
+  #   min_temp: 16
+  #   max_temp: 32
+  #   cold_tolerance: 0.4
+  #   hot_tolerance: 0.1
+  #   target_temp_step: 0.1
+  #   min_cycle_duration:
+  #     minutes: 1
+  #   away:
+  #     temperature: 28.0
+  #     target_temp_low: 27
+  #     target_temp_high: 29.5
+  #   home:
+  #     temperature: 23.0
+  #     target_temp_low: 22.5
+  #     target_temp_high: 23.5
+  #   comfort:
+  #     temperature: 25.0
+  #     target_temp_low: 24
+  #     target_temp_high: 25.5
+  #   sleep:
+  #     temperature: 27.5
+  #     target_temp_low: 26.5
+  #     target_temp_high: 28.0
+
   - platform: dual_smart_thermostat
-    name: Edge Case 239
-    unique_id: edge_case_239
+    name: Edge Case 289
+    unique_id: edge_case_289
     heater: switch.heater
-    # cooler: switch.cooler
+    cooler: switch.cooler
     target_sensor: sensor.room_temp
-    heat_cool_mode: false #true # <-important
-    keep_alive: #lo attivo e commento initial_hvac_mode per verificare se mantiene lo stato al riavvio
-      minutes: 2
-    ac_mode: true
+    ac_mode: false
     min_temp: 16
-    max_temp: 32
-    cold_tolerance: 0.4
-    hot_tolerance: 0.1
+    max_temp: 30
+    cold_tolerance: 1
+    hot_tolerance: 1
     target_temp_step: 0.1
-    min_cycle_duration:
-      minutes: 1
-    away:
-      temperature: 28.0
-      target_temp_low: 27
-      target_temp_high: 29.5
-    home:
-      temperature: 23.0
-      target_temp_low: 22.5
-      target_temp_high: 23.5
-    comfort:
-      temperature: 25.0
-      target_temp_low: 24
-      target_temp_high: 25.5
-    sleep:
-      temperature: 27.5
-      target_temp_low: 26.5
-      target_temp_high: 28.0
+    precision: 0.1
 
   # - platform: dual_smart_thermostat
   #   name: Edge Case 210
diff --git a/custom_components/dual_smart_thermostat/managers/environment_manager.py b/custom_components/dual_smart_thermostat/managers/environment_manager.py
index 0b33703..1018d7c 100644
--- a/custom_components/dual_smart_thermostat/managers/environment_manager.py
+++ b/custom_components/dual_smart_thermostat/managers/environment_manager.py
@@ -765,14 +765,17 @@ def _set_temps_when_target_mode(
             self.target_temp = self.saved_target_temp
         # switching from preset NONE to NONE
         elif supports_temp_range:
-            if hvac_mode in [HVACMode.COOL, HVACMode.FAN_ONLY]:
+            if (
+                hvac_mode in [HVACMode.COOL, HVACMode.FAN_ONLY]
+                and self.target_temp_high is not None
+            ):
                 _LOGGER.debug(
                     "Setting temperatures from no preset target mode. HVACMode.COOL, target temp: %s",
                     self.target_temp,
                 )
                 self.target_temp = self.target_temp_high
 
-            elif hvac_mode == HVACMode.HEAT:
+            elif hvac_mode == HVACMode.HEAT and self.target_temp_low is not None:
                 _LOGGER.debug(
                     "Setting temperatures from no preset target mode. HVACMode.HEAT, target temp: %s",
                     self.target_temp,
diff --git a/tests/test_dual_mode.py b/tests/test_dual_mode.py
index 2ad8d90..8a61722 100644
--- a/tests/test_dual_mode.py
+++ b/tests/test_dual_mode.py
@@ -425,6 +425,25 @@ async def test_heat_cool_get_hvac_modes_fan_configured(
     )
 
 
+async def test_set_hvac_mode_chnage_trarget_temp(
+    hass: HomeAssistant, setup_comp_dual  # noqa: F811
+) -> None:
+    """Test the changing of the hvac mode avoid invalid target temp."""
+    await common.async_set_temperature(hass, 30)
+    state = hass.states.get(common.ENTITY)
+    assert state.attributes.get("temperature") == 30
+
+    await common.async_set_hvac_mode(hass, HVACMode.COOL)
+    await hass.async_block_till_done()
+    state = hass.states.get(common.ENTITY)
+    assert state.attributes.get("temperature") == 30
+
+    await common.async_set_hvac_mode(hass, HVACMode.HEAT)
+    await hass.async_block_till_done()
+    state = hass.states.get(common.ENTITY)
+    assert state.attributes.get("temperature") == 30
+
+
 async def test_set_target_temp_dual(
     hass: HomeAssistant, setup_comp_dual  # noqa: F811
 ) -> None: