diff --git a/custom_components/luxtronik/climate.py b/custom_components/luxtronik/climate.py
index d124e6d..fc77af1 100644
--- a/custom_components/luxtronik/climate.py
+++ b/custom_components/luxtronik/climate.py
@@ -103,8 +103,7 @@
         hvac_mode_mapping=HVAC_MODE_MAPPING_HEAT,
         hvac_action_mapping=HVAC_ACTION_MAPPING_HEAT,
         preset_modes=[PRESET_NONE, PRESET_AWAY, PRESET_BOOST],
-        supported_features=ClimateEntityFeature.AUX_HEAT
-        | ClimateEntityFeature.PRESET_MODE  # noqa: W503
+        supported_features=ClimateEntityFeature.PRESET_MODE
         | ClimateEntityFeature.TARGET_TEMPERATURE,  # noqa: W503
         luxtronik_key=LuxParameter.P0003_MODE_HEATING,
         # luxtronik_key_current_temperature=LuxCalculation.C0227_ROOM_THERMOSTAT_TEMPERATURE,
@@ -172,7 +171,7 @@ class LuxtronikClimateExtraStoredData(ExtraStoredData):
     _attr_target_temperature: float | None = None
     _attr_hvac_mode: HVACMode | str | None = None
     _attr_preset_mode: str | None = None
-    _attr_is_aux_heat: bool | None = None
+    # _attr_is_aux_heat: bool | None = None
     last_hvac_mode_before_preset: str | None = None
 
     def as_dict(self) -> dict[str, Any]:
@@ -194,7 +193,7 @@ class LuxtronikThermostat(LuxtronikEntity, ClimateEntity, RestoreEntity):
     _attr_target_temperature_low = 18.0
     _attr_target_temperature_step = 0.5
 
-    _attr_is_aux_heat: bool | None = None
+    # _attr_is_aux_heat: bool | None = None
     _attr_hvac_mode: HVACMode | str | None = None
     _attr_preset_mode: str | None = None
 
@@ -254,10 +253,10 @@ def _handle_coordinator_update(
             if lux_action is None
             else self.entity_description.hvac_action_mapping[lux_action]
         )
-        self._attr_is_aux_heat = (
-            None if mode is None else mode == LuxMode.second_heatsource.value
-        )
-        if self._attr_preset_mode == PRESET_NONE or self._attr_is_aux_heat:
+        # self._attr_is_aux_heat = (
+        #     None if mode is None else mode == LuxMode.second_heatsource.value
+        # )
+        if self._attr_preset_mode == PRESET_NONE:  # or self._attr_is_aux_heat:
             self._last_hvac_mode_before_preset = None
         key = self.entity_description.luxtronik_key_current_temperature
         if isinstance(key, str):
@@ -339,27 +338,27 @@ async def async_set_preset_mode(self, preset_mode: str) -> None:
             lux_mode = LuxMode.off.value
         await self._async_set_lux_mode(lux_mode)
 
-    async def async_turn_aux_heat_on(self) -> None:
-        """Turn auxiliary heater on."""
-        self._attr_is_aux_heat = True
-        if self._last_hvac_mode_before_preset is None:
-            self._last_hvac_mode_before_preset = self._attr_hvac_mode
-        await self._async_set_lux_mode(LuxMode.second_heatsource.value)
-
-    async def async_turn_aux_heat_off(self) -> None:
-        """Turn auxiliary heater off."""
-        self._attr_is_aux_heat = False
-        if (self._last_hvac_mode_before_preset is None) or (
-            not self._last_hvac_mode_before_preset in HVAC_PRESET_MAPPING
-        ):
-            await self._async_set_lux_mode(LuxMode.automatic.value)
-        else:
-            lux_mode = [
-                k
-                for k, v in HVAC_PRESET_MAPPING.items()
-                if v == self._last_hvac_mode_before_preset
-            ][0]
-            await self._async_set_lux_mode(lux_mode)
+    # async def async_turn_aux_heat_on(self) -> None:
+    #     """Turn auxiliary heater on."""
+    #     self._attr_is_aux_heat = True
+    #     if self._last_hvac_mode_before_preset is None:
+    #         self._last_hvac_mode_before_preset = self._attr_hvac_mode
+    #     await self._async_set_lux_mode(LuxMode.second_heatsource.value)
+
+    # async def async_turn_aux_heat_off(self) -> None:
+    #     """Turn auxiliary heater off."""
+    #     self._attr_is_aux_heat = False
+    #     if (self._last_hvac_mode_before_preset is None) or (
+    #         not self._last_hvac_mode_before_preset in HVAC_PRESET_MAPPING
+    #     ):
+    #         await self._async_set_lux_mode(LuxMode.automatic.value)
+    #     else:
+    #         lux_mode = [
+    #             k
+    #             for k, v in HVAC_PRESET_MAPPING.items()
+    #             if v == self._last_hvac_mode_before_preset
+    #         ][0]
+    #         await self._async_set_lux_mode(lux_mode)
 
     @property
     def extra_restore_state_data(self) -> LuxtronikClimateExtraStoredData:
@@ -368,6 +367,6 @@ def extra_restore_state_data(self) -> LuxtronikClimateExtraStoredData:
             self._attr_target_temperature,
             self._attr_hvac_mode,
             self._attr_preset_mode,
-            self._attr_is_aux_heat,
+            # self._attr_is_aux_heat,
             self._last_hvac_mode_before_preset,
         )
diff --git a/custom_components/luxtronik/const.py b/custom_components/luxtronik/const.py
index 3b9f127..9fe9d50 100644
--- a/custom_components/luxtronik/const.py
+++ b/custom_components/luxtronik/const.py
@@ -172,7 +172,7 @@ class LuxStatus3Option(StrEnum):
     thermal_desinfection: Final = ("thermal desinfection",)
     cooling: Final = ("cooling",)
     swimming_pool_solar: Final = ("swimming pool/solar",)
-    heating_external_energy_source: Final = ("heating external engery source",)
+    heating_external_energy_source: Final = ("heating external energy source",)
     domestic_water_external_energy_source: Final = (
         "domestic water external energy source",
     )
diff --git a/custom_components/luxtronik/lux_helper.py b/custom_components/luxtronik/lux_helper.py
index 3757a07..ea36081 100644
--- a/custom_components/luxtronik/lux_helper.py
+++ b/custom_components/luxtronik/lux_helper.py
@@ -6,7 +6,6 @@
 import struct
 import threading
 import time
-import asyncio
 
 from async_timeout import timeout
 
diff --git a/custom_components/luxtronik/manifest.json b/custom_components/luxtronik/manifest.json
index a8f1a21..5bf1d90 100755
--- a/custom_components/luxtronik/manifest.json
+++ b/custom_components/luxtronik/manifest.json
@@ -9,7 +9,7 @@
   "after_dependencies": [],
   "codeowners": ["@BenPru"],
   "iot_class": "local_polling",
-  "version": "2023.11.30",
+  "version": "2024.9.23",
   "homeassistant": "2023.1.0",
   "dhcp": [
     { "macaddress": "000E8C*" },