diff --git a/custom_components/bluetti_bt/binary_sensor.py b/custom_components/bluetti_bt/binary_sensor.py
index 67cfe38..ecf00d9 100644
--- a/custom_components/bluetti_bt/binary_sensor.py
+++ b/custom_components/bluetti_bt/binary_sensor.py
@@ -35,7 +35,7 @@ _LOGGER = logging.getLogger(__name__)
 async def async_setup_entry(
     hass: HomeAssistant, entry: ConfigEntry, async_add_entities: AddEntitiesCallback
 ) -> None:
-    """Setup sensor entities."""
+    """Setup binary_sensor entities."""
 
     device_name = entry.data.get(CONF_NAME)
     address = entry.data.get(CONF_ADDRESS)
@@ -43,7 +43,7 @@ async def async_setup_entry(
         _LOGGER.error("Device has no address")
 
     # Generate device info
-    _LOGGER.info("Creating sensors for device with address %s", address)
+    _LOGGER.info("Creating binary_sensors for device with address %s", address)
     device_info = dev_info(entry)
 
     # Add sensors according to device_info
@@ -105,8 +105,8 @@ class BluettiBinarySensor(CoordinatorEntity, BinarySensorEntity):
         """Handle updated data from the coordinator."""
         _LOGGER.debug("Updating state of %s", self._attr_unique_id)
         if not isinstance(self.coordinator.data, dict):
-            _LOGGER.error(
-                "Invalid data from coordinator (sensor.%s)", self._attr_unique_id
+            _LOGGER.debug(
+                "Invalid data from coordinator (binary_sensor.%s)", self._attr_unique_id
             )
             self._attr_available = False
             return
@@ -118,7 +118,7 @@ class BluettiBinarySensor(CoordinatorEntity, BinarySensorEntity):
 
         if not isinstance(response_data, bool):
             _LOGGER.warning(
-                "Invalid response data type from coordinator (sensor.%s): %s",
+                "Invalid response data type from coordinator (binary_sensor.%s): %s",
                 self._attr_unique_id,
                 response_data,
             )
diff --git a/custom_components/bluetti_bt/config_flow.py b/custom_components/bluetti_bt/config_flow.py
index 6dcb071..025f2ef 100644
--- a/custom_components/bluetti_bt/config_flow.py
+++ b/custom_components/bluetti_bt/config_flow.py
@@ -108,6 +108,11 @@ class OptionsFlowHandler(config_entries.OptionsFlow):
     ) -> FlowResult:
         """Manage the options."""
         if user_input is not None:
+
+            # Validate update interval
+            if user_input[CONF_POLLING_INTERVAL] < 5:
+                return self.async_abort(reason="invalid_interval")
+
             changed = self.hass.config_entries.async_update_entry(
                 self.config_entry,
                 data={
diff --git a/custom_components/bluetti_bt/sensor.py b/custom_components/bluetti_bt/sensor.py
index 66ca581..1347396 100644
--- a/custom_components/bluetti_bt/sensor.py
+++ b/custom_components/bluetti_bt/sensor.py
@@ -131,7 +131,7 @@ class BluettiSensor(CoordinatorEntity, SensorEntity):
         """Handle updated data from the coordinator."""
         _LOGGER.debug("Updating state of %s", self._attr_unique_id)
         if not isinstance(self.coordinator.data, dict):
-            _LOGGER.error(
+            _LOGGER.debug(
                 "Invalid data from coordinator (sensor.%s)", self._attr_unique_id
             )
             self._attr_available = False
diff --git a/custom_components/bluetti_bt/switch.py b/custom_components/bluetti_bt/switch.py
index 0d6a83e..2945226 100644
--- a/custom_components/bluetti_bt/switch.py
+++ b/custom_components/bluetti_bt/switch.py
@@ -50,7 +50,7 @@ async def async_setup_entry(
         _LOGGER.error("Device has no address")
 
     # Generate device info
-    _LOGGER.info("Creating sensors for device with address %s", address)
+    _LOGGER.info("Creating switches for device with address %s", address)
     device_info = dev_info(entry)
 
     # Add sensors according to device_info
@@ -116,7 +116,7 @@ class BluettiSwitch(CoordinatorEntity, SwitchEntity):
         _LOGGER.debug("Updating state of %s", self._attr_unique_id)
         if not isinstance(self.coordinator.data, dict):
             _LOGGER.error(
-                "Invalid data from coordinator (sensor.%s)", self._attr_unique_id
+                "Invalid data from coordinator (switch.%s)", self._attr_unique_id
             )
             self._attr_available = False
             return
@@ -128,7 +128,7 @@ class BluettiSwitch(CoordinatorEntity, SwitchEntity):
 
         if not isinstance(response_data, bool):
             _LOGGER.warning(
-                "Invalid response data type from coordinator (sensor.%s): %s",
+                "Invalid response data type from coordinator (switch.%s): %s",
                 self._attr_unique_id,
                 response_data,
             )
diff --git a/custom_components/bluetti_bt/translations/de.json b/custom_components/bluetti_bt/translations/de.json
index abe7a9e..b30d9f9 100644
--- a/custom_components/bluetti_bt/translations/de.json
+++ b/custom_components/bluetti_bt/translations/de.json
@@ -4,10 +4,13 @@
       "init": {
         "data": {
           "use_controls": "Steuerung aktivieren (auf eigenes Risiko)",
-          "persistant_conn": "Dauerhafte Verbindung",
+          "persistant_conn": "Dauerhafte Verbindung (Neustart erforderlich)",
           "polling_interval": "Datenabruf-Intervall in Sekunden (Neustart erforderlich)"
         }
       }
+    },
+    "abort": {
+      "invalid_interval": "Ungültiger Datenabruf-Intervall. Verwende 5 Sekunden oder mehr"
     }
   }
 }
\ No newline at end of file
diff --git a/custom_components/bluetti_bt/translations/en.json b/custom_components/bluetti_bt/translations/en.json
index 5aa6eb7..3d0e7e6 100644
--- a/custom_components/bluetti_bt/translations/en.json
+++ b/custom_components/bluetti_bt/translations/en.json
@@ -4,10 +4,13 @@
       "init": {
         "data": {
           "use_controls": "Use controls (use at own risk)",
-          "persistant_conn": "Persistant connection",
+          "persistant_conn": "Persistant connection (restart required)",
           "polling_interval": "Polling interval in seconds (restart required)"
         }
       }
+    },
+    "abort": {
+      "invalid_interval": "Invalid polling interval. Use 5 seconds or more"
     }
   }
 }
\ No newline at end of file