diff --git a/homeassistant/components/lamarzocco/sensor.py b/homeassistant/components/lamarzocco/sensor.py
index a432f5b8dae..1f4983a03a8 100644
--- a/homeassistant/components/lamarzocco/sensor.py
+++ b/homeassistant/components/lamarzocco/sensor.py
@@ -56,6 +56,13 @@ ENTITIES: tuple[LaMarzoccoSensorEntityDescription, ...] = (
                 CoffeeBoiler, config[WidgetType.CM_COFFEE_BOILER]
             ).ready_start_time
         ),
+        available_fn=(
+            lambda coordinator: cast(
+                CoffeeBoiler,
+                coordinator.device.dashboard.config[WidgetType.CM_COFFEE_BOILER],
+            ).ready_start_time
+            is not None
+        ),
         entity_category=EntityCategory.DIAGNOSTIC,
     ),
     LaMarzoccoSensorEntityDescription(
@@ -67,11 +74,18 @@ ENTITIES: tuple[LaMarzoccoSensorEntityDescription, ...] = (
                 SteamBoilerLevel, config[WidgetType.CM_STEAM_BOILER_LEVEL]
             ).ready_start_time
         ),
-        entity_category=EntityCategory.DIAGNOSTIC,
         supported_fn=(
             lambda coordinator: coordinator.device.dashboard.model_name
             in (ModelName.LINEA_MICRA, ModelName.LINEA_MINI_R)
         ),
+        available_fn=(
+            lambda coordinator: cast(
+                SteamBoilerLevel,
+                coordinator.device.dashboard.config[WidgetType.CM_STEAM_BOILER_LEVEL],
+            ).ready_start_time
+            is not None
+        ),
+        entity_category=EntityCategory.DIAGNOSTIC,
     ),
     LaMarzoccoSensorEntityDescription(
         key="brewing_start_time",
diff --git a/tests/components/lamarzocco/snapshots/test_sensor.ambr b/tests/components/lamarzocco/snapshots/test_sensor.ambr
index eea4616d0ff..3dd1ff9b665 100644
--- a/tests/components/lamarzocco/snapshots/test_sensor.ambr
+++ b/tests/components/lamarzocco/snapshots/test_sensor.ambr
@@ -94,7 +94,7 @@
     'last_changed': <ANY>,
     'last_reported': <ANY>,
     'last_updated': <ANY>,
-    'state': 'unknown',
+    'state': 'unavailable',
   })
 # ---
 # name: test_sensors[sensor.gs012345_last_cleaning_time-entry]