diff --git a/homeassistant/components/comelit/const.py b/homeassistant/components/comelit/const.py
index 84d8fbd6315..f52f33fd6da 100644
--- a/homeassistant/components/comelit/const.py
+++ b/homeassistant/components/comelit/const.py
@@ -9,3 +9,5 @@ _LOGGER = logging.getLogger(__package__)
 DOMAIN = "comelit"
 DEFAULT_PORT = 80
 DEVICE_TYPE_LIST = [BRIDGE, VEDO]
+
+SCAN_INTERVAL = 5
diff --git a/homeassistant/components/comelit/coordinator.py b/homeassistant/components/comelit/coordinator.py
index b3be3a47825..df4965d9945 100644
--- a/homeassistant/components/comelit/coordinator.py
+++ b/homeassistant/components/comelit/coordinator.py
@@ -22,7 +22,7 @@ from homeassistant.exceptions import ConfigEntryAuthFailed
 from homeassistant.helpers import device_registry as dr
 from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
 
-from .const import _LOGGER, DOMAIN
+from .const import _LOGGER, DOMAIN, SCAN_INTERVAL
 
 type ComelitConfigEntry = ConfigEntry[ComelitBaseCoordinator]
 
@@ -53,7 +53,7 @@ class ComelitBaseCoordinator(DataUpdateCoordinator[T]):
             logger=_LOGGER,
             config_entry=entry,
             name=f"{DOMAIN}-{host}-coordinator",
-            update_interval=timedelta(seconds=5),
+            update_interval=timedelta(seconds=SCAN_INTERVAL),
         )
         device_registry = dr.async_get(self.hass)
         device_registry.async_get_or_create(
diff --git a/tests/components/comelit/test_coordinator.py b/tests/components/comelit/test_coordinator.py
new file mode 100644
index 00000000000..a8ef82a7e89
--- /dev/null
+++ b/tests/components/comelit/test_coordinator.py
@@ -0,0 +1,49 @@
+"""Tests for Comelit SimpleHome coordinator."""
+
+from unittest.mock import AsyncMock
+
+from aiocomelit.exceptions import CannotAuthenticate, CannotConnect, CannotRetrieveData
+from freezegun.api import FrozenDateTimeFactory
+import pytest
+
+from homeassistant.components.comelit.const import SCAN_INTERVAL
+from homeassistant.const import STATE_OFF, STATE_UNAVAILABLE
+from homeassistant.core import HomeAssistant
+
+from . import setup_integration
+
+from tests.common import MockConfigEntry, async_fire_time_changed
+
+
+@pytest.mark.parametrize(
+    "side_effect",
+    [
+        CannotConnect,
+        CannotRetrieveData,
+        CannotAuthenticate,
+    ],
+)
+async def test_coordinator_data_update_fails(
+    hass: HomeAssistant,
+    freezer: FrozenDateTimeFactory,
+    mock_serial_bridge: AsyncMock,
+    mock_serial_bridge_config_entry: MockConfigEntry,
+    side_effect: Exception,
+) -> None:
+    """Test coordinator data update exceptions."""
+
+    entity_id = "light.light0"
+
+    await setup_integration(hass, mock_serial_bridge_config_entry)
+
+    assert (state := hass.states.get(entity_id))
+    assert state.state == STATE_OFF
+
+    mock_serial_bridge.login.side_effect = side_effect
+
+    freezer.tick(SCAN_INTERVAL)
+    async_fire_time_changed(hass)
+    await hass.async_block_till_done(wait_background_tasks=True)
+
+    assert (state := hass.states.get(entity_id))
+    assert state.state == STATE_UNAVAILABLE