diff --git a/custom_components/dual_smart_thermostat/hvac_device/cooler_fan_device.py b/custom_components/dual_smart_thermostat/hvac_device/cooler_fan_device.py
index 035ea43..d5d6424 100644
--- a/custom_components/dual_smart_thermostat/hvac_device/cooler_fan_device.py
+++ b/custom_components/dual_smart_thermostat/hvac_device/cooler_fan_device.py
@@ -160,7 +160,8 @@ async def async_control_hvac(self, time=None, force=False):
                 await self.async_turn_off()
                 self.HVACActionReason = HVACActionReason.NONE
             case _:
-                _LOGGER.warning("Invalid HVAC mode: %s", self._hvac_mode)
+                if self._hvac_mode is not None:
+                    _LOGGER.warning("Invalid HVAC mode: %s", self._hvac_mode)
 
     async def async_turn_on(self):
         """self._control_hvac will handle the logic for turning on the heater and aux heater."""
diff --git a/custom_components/dual_smart_thermostat/hvac_device/heater_cooler_device.py b/custom_components/dual_smart_thermostat/hvac_device/heater_cooler_device.py
index bcfa48f..2b57d85 100644
--- a/custom_components/dual_smart_thermostat/hvac_device/heater_cooler_device.py
+++ b/custom_components/dual_smart_thermostat/hvac_device/heater_cooler_device.py
@@ -122,7 +122,8 @@ async def async_control_hvac(self, time=None, force=False):
             case HVACMode.OFF:
                 await self.async_turn_off()
             case _:
-                _LOGGER.warning("Invalid HVAC mode: %s", self._hvac_mode)
+                if self._hvac_mode is not None:
+                    _LOGGER.warning("Invalid HVAC mode: %s", self._hvac_mode)
 
     def is_cold_or_hot(self) -> tuple[bool, bool, ToleranceDevice]:
         """Check if the floor is too cold or too hot."""