diff --git a/custom_components/saleryd_hrv/__init__.py b/custom_components/saleryd_hrv/__init__.py
index eda0ead..7270ac4 100644
--- a/custom_components/saleryd_hrv/__init__.py
+++ b/custom_components/saleryd_hrv/__init__.py
@@ -18,8 +18,6 @@
     DOMAIN,
     PLATFORMS,
     STARTUP_MESSAGE,
-    SUPPORTED_FIRMWARES,
-    UNSUPPORTED_FIRMWARES,
 )
 from .coordinator import SalerydLokeDataUpdateCoordinator
 
@@ -28,24 +26,6 @@
 _LOGGER: logging.Logger = logging.getLogger(__package__)
 
 
-def log_unsupported_firmware(data):
-    """Write to logs if firmware version is unsupported"""
-    version = data.get("*SC")
-    if version:
-        if version not in SUPPORTED_FIRMWARES:
-            _LOGGER.warning(
-                "Your control system version is (%s). This integration has been verified to work with the following versions: %s",
-                version,
-                ", ".join(SUPPORTED_FIRMWARES),
-            )
-        if version in UNSUPPORTED_FIRMWARES:
-            _LOGGER.error(
-                "Your control system version is (%s). This integration is incompatible with the following versions: %s",
-                version,
-                ", ".join(UNSUPPORTED_FIRMWARES),
-            )
-
-
 async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry):
     """Set up this integration using UI."""
     if hass.data.get(DOMAIN) is None:
@@ -70,11 +50,7 @@ async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry):
         update_interval=SCAN_INTERVAL,
     )
 
-    await asyncio.sleep(
-        SCAN_INTERVAL.seconds
-    )  # sleep to ensure coordinator collects all data
     await coordinator.async_config_entry_first_refresh()
-    log_unsupported_firmware(coordinator.data)
 
     hass.data[DOMAIN][entry.entry_id] = coordinator
 
diff --git a/custom_components/saleryd_hrv/const.py b/custom_components/saleryd_hrv/const.py
index ddb58f7..65b5245 100644
--- a/custom_components/saleryd_hrv/const.py
+++ b/custom_components/saleryd_hrv/const.py
@@ -49,3 +49,5 @@
 
 HEATER_MODE_LOW = 0
 HEATER_MODE_HIGH = 1
+
+WARNING_POWER_OFF = "Avstängd"
diff --git a/custom_components/saleryd_hrv/sensor.py b/custom_components/saleryd_hrv/sensor.py
index 2ab2841..303981c 100644
--- a/custom_components/saleryd_hrv/sensor.py
+++ b/custom_components/saleryd_hrv/sensor.py
@@ -1,5 +1,7 @@
 """Sensor platform"""
 
+from datetime import timedelta
+import logging
 from typing import Any
 
 from homeassistant.components.sensor import (
@@ -18,7 +20,7 @@
 from homeassistant.helpers.entity import EntityCategory
 from homeassistant.helpers.entity_platform import AddEntitiesCallback
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
-from homeassistant.util import slugify
+from homeassistant.util import Throttle, slugify
 
 from .const import (
     CLIENT_STATE,
@@ -26,15 +28,21 @@
     DOMAIN,
     HEATER_MODE_HIGH,
     HEATER_MODE_LOW,
+    ISSUE_URL,
+    SUPPORTED_FIRMWARES,
     TEMPERATURE_MODE_COOL,
     TEMPERATURE_MODE_ECO,
     TEMPERATURE_MODE_NORMAL,
+    UNSUPPORTED_FIRMWARES,
     VENTILATION_MODE_AWAY,
     VENTILATION_MODE_BOOST,
     VENTILATION_MODE_HOME,
+    WARNING_POWER_OFF,
 )
 from .entity import SalerydLokeEntity
 
+_LOGGER: logging.Logger = logging.getLogger(__package__)
+
 
 class SalerydLokeSensor(SalerydLokeEntity, SensorEntity):
     """Sensor base class."""
@@ -50,12 +58,45 @@ def __init__(
 
         super().__init__(coordinator, entry_id, entity_description)
 
+    @Throttle(min_time=timedelta(minutes=1))
+    def _log_unknown_sensor_value(self, value):
+        _LOGGER.warning(
+            "Unknown value [%s] for sensor [%s] [%s], feel free to file an issue with the integration at %s and provide this message.",
+            value,
+            self.entity_description.name,
+            self.entity_description.key,
+            ISSUE_URL,
+        )
+
+    @Throttle(min_time=timedelta(days=1))
+    def _log_unsupported_firmware(self, version):
+        """Write to logs if firmware version is unsupported"""
+        _LOGGER.error(
+            "Your control system version is (%s). This integration is incompatible with the following versions: %s",
+            version,
+            ", ".join(UNSUPPORTED_FIRMWARES),
+        )
+
+    @Throttle(min_time=timedelta(days=1))
+    def _log_unknown_firmware(self, version):
+        _LOGGER.warning(
+            "Unknown support for your control system version (%s), feel free to file an issue with the integration at %s and provide this message. This integration has been verified to work with the following versions: %s",
+            version,
+            ISSUE_URL,
+            ", ".join(SUPPORTED_FIRMWARES),
+        )
+
     def _translate_value(self, value):
+        if value is None:
+            return value
+
         if self.entity_description.key == "MG":
             if value == HEATER_MODE_LOW:
                 return 900
             elif value == HEATER_MODE_HIGH:
                 return 1800
+            else:
+                self._log_unknown_sensor_value(value)
 
         if self.entity_description.key == "MT":
             if value == TEMPERATURE_MODE_NORMAL:
@@ -64,6 +105,8 @@ def _translate_value(self, value):
                 return "Eco"
             elif value == TEMPERATURE_MODE_COOL:
                 return "Cool"
+            else:
+                self._log_unknown_sensor_value(value)
 
         if self.entity_description.key == "MF":
             if value == VENTILATION_MODE_HOME:
@@ -72,6 +115,20 @@ def _translate_value(self, value):
                 return "Away"
             elif value == VENTILATION_MODE_BOOST:
                 return "Boost"
+            else:
+                self._log_unknown_sensor_value(value)
+
+        if self.entity_description.key == "*EB":
+            if isinstance(value, str):
+                if WARNING_POWER_OFF in value:
+                    return "Power off"
+            self._log_unknown_sensor_value(value)
+
+        if self.entity_description.key == "*SC":
+            if value not in SUPPORTED_FIRMWARES:
+                self._log_unknown_firmware(value)
+            if value in UNSUPPORTED_FIRMWARES:
+                self._log_unsupported_firmware(value)
 
         return value
 
@@ -277,6 +334,15 @@ def extra_state_attributes(self) -> dict[str, Any] | None:
             entity_category=EntityCategory.DIAGNOSTIC,
         ),
     },
+    "control_system_warning": {
+        "klass": SalerydLokeSensor,
+        "description": SensorEntityDescription(
+            key="*EB",
+            icon="mdi:alert",
+            name="System warning",
+            device_class=SensorDeviceClass.ENUM,
+        ),
+    },
 }