diff --git a/homeassistant/components/vicare/sensor.py b/homeassistant/components/vicare/sensor.py
index 312a05e813d..cb76c910255 100644
--- a/homeassistant/components/vicare/sensor.py
+++ b/homeassistant/components/vicare/sensor.py
@@ -600,6 +600,7 @@ BURNER_SENSORS: tuple[ViCareSensorEntityDescription, ...] = (
         translation_key="burner_starts",
         icon="mdi:counter",
         value_getter=lambda api: api.getStarts(),
+        entity_category=EntityCategory.DIAGNOSTIC,
         state_class=SensorStateClass.TOTAL_INCREASING,
     ),
     ViCareSensorEntityDescription(
@@ -608,6 +609,7 @@ BURNER_SENSORS: tuple[ViCareSensorEntityDescription, ...] = (
         icon="mdi:counter",
         native_unit_of_measurement=UnitOfTime.HOURS,
         value_getter=lambda api: api.getHours(),
+        entity_category=EntityCategory.DIAGNOSTIC,
         state_class=SensorStateClass.TOTAL_INCREASING,
     ),
     ViCareSensorEntityDescription(
@@ -626,6 +628,7 @@ COMPRESSOR_SENSORS: tuple[ViCareSensorEntityDescription, ...] = (
         translation_key="compressor_starts",
         icon="mdi:counter",
         value_getter=lambda api: api.getStarts(),
+        entity_category=EntityCategory.DIAGNOSTIC,
         state_class=SensorStateClass.TOTAL_INCREASING,
     ),
     ViCareSensorEntityDescription(
@@ -634,6 +637,7 @@ COMPRESSOR_SENSORS: tuple[ViCareSensorEntityDescription, ...] = (
         icon="mdi:counter",
         native_unit_of_measurement=UnitOfTime.HOURS,
         value_getter=lambda api: api.getHours(),
+        entity_category=EntityCategory.DIAGNOSTIC,
         state_class=SensorStateClass.TOTAL_INCREASING,
     ),
     ViCareSensorEntityDescription(
@@ -642,6 +646,7 @@ COMPRESSOR_SENSORS: tuple[ViCareSensorEntityDescription, ...] = (
         icon="mdi:counter",
         native_unit_of_measurement=UnitOfTime.HOURS,
         value_getter=lambda api: api.getHoursLoadClass1(),
+        entity_category=EntityCategory.DIAGNOSTIC,
         state_class=SensorStateClass.TOTAL_INCREASING,
         entity_registry_enabled_default=False,
     ),
@@ -651,6 +656,7 @@ COMPRESSOR_SENSORS: tuple[ViCareSensorEntityDescription, ...] = (
         icon="mdi:counter",
         native_unit_of_measurement=UnitOfTime.HOURS,
         value_getter=lambda api: api.getHoursLoadClass2(),
+        entity_category=EntityCategory.DIAGNOSTIC,
         state_class=SensorStateClass.TOTAL_INCREASING,
         entity_registry_enabled_default=False,
     ),
@@ -660,6 +666,7 @@ COMPRESSOR_SENSORS: tuple[ViCareSensorEntityDescription, ...] = (
         icon="mdi:counter",
         native_unit_of_measurement=UnitOfTime.HOURS,
         value_getter=lambda api: api.getHoursLoadClass3(),
+        entity_category=EntityCategory.DIAGNOSTIC,
         state_class=SensorStateClass.TOTAL_INCREASING,
         entity_registry_enabled_default=False,
     ),
@@ -669,6 +676,7 @@ COMPRESSOR_SENSORS: tuple[ViCareSensorEntityDescription, ...] = (
         icon="mdi:counter",
         native_unit_of_measurement=UnitOfTime.HOURS,
         value_getter=lambda api: api.getHoursLoadClass4(),
+        entity_category=EntityCategory.DIAGNOSTIC,
         state_class=SensorStateClass.TOTAL_INCREASING,
         entity_registry_enabled_default=False,
     ),
@@ -678,6 +686,7 @@ COMPRESSOR_SENSORS: tuple[ViCareSensorEntityDescription, ...] = (
         icon="mdi:counter",
         native_unit_of_measurement=UnitOfTime.HOURS,
         value_getter=lambda api: api.getHoursLoadClass5(),
+        entity_category=EntityCategory.DIAGNOSTIC,
         state_class=SensorStateClass.TOTAL_INCREASING,
         entity_registry_enabled_default=False,
     ),