diff --git a/homeassistant/components/fireservicerota/binary_sensor.py b/homeassistant/components/fireservicerota/binary_sensor.py
index 27f2c4a4526..d2f4e2e11f2 100644
--- a/homeassistant/components/fireservicerota/binary_sensor.py
+++ b/homeassistant/components/fireservicerota/binary_sensor.py
@@ -49,23 +49,10 @@ class ResponseBinarySensor(CoordinatorEntity, BinarySensorEntity):
         self._client = client
         self._attr_unique_id = f"{entry.unique_id}_Duty"
 
-        self._state: bool | None = None
-
-    @property
-    def icon(self) -> str:
-        """Return the icon to use in the frontend."""
-        if self._state:
-            return "mdi:calendar-check"
-
-        return "mdi:calendar-remove"
-
     @property
     def is_on(self) -> bool | None:
         """Return the state of the binary sensor."""
-
-        self._state = self._client.on_duty
-
-        return self._state
+        return self._client.on_duty
 
     @property
     def extra_state_attributes(self) -> dict[str, Any]:
diff --git a/homeassistant/components/fireservicerota/icons.json b/homeassistant/components/fireservicerota/icons.json
new file mode 100644
index 00000000000..8de4c444ca8
--- /dev/null
+++ b/homeassistant/components/fireservicerota/icons.json
@@ -0,0 +1,12 @@
+{
+  "entity": {
+    "binary_sensor": {
+      "duty": {
+        "default": "mdi:calendar-remove",
+        "state": {
+          "on": "mdi:calendar-check"
+        }
+      }
+    }
+  }
+}