diff --git a/homeassistant/components/openevse/sensor.py b/homeassistant/components/openevse/sensor.py
index 85b376c4aec..6321c70e22c 100644
--- a/homeassistant/components/openevse/sensor.py
+++ b/homeassistant/components/openevse/sensor.py
@@ -10,7 +10,6 @@ from openevsehttp.__main__ import OpenEVSE
 import voluptuous as vol
 
 from homeassistant.components.sensor import (
-    DOMAIN as HOMEASSISTANT_DOMAIN,
     PLATFORM_SCHEMA as SENSOR_PLATFORM_SCHEMA,
     SensorDeviceClass,
     SensorEntity,
@@ -27,7 +26,7 @@ from homeassistant.const import (
     UnitOfTemperature,
     UnitOfTime,
 )
-from homeassistant.core import HomeAssistant
+from homeassistant.core import DOMAIN as HOMEASSISTANT_DOMAIN, HomeAssistant
 from homeassistant.data_entry_flow import FlowResultType
 from homeassistant.helpers import config_validation as cv, issue_registry as ir
 from homeassistant.helpers.device_registry import CONNECTION_NETWORK_MAC, DeviceInfo
diff --git a/homeassistant/components/openevse/strings.json b/homeassistant/components/openevse/strings.json
index d5afcbfa951..f3f75f541d8 100644
--- a/homeassistant/components/openevse/strings.json
+++ b/homeassistant/components/openevse/strings.json
@@ -55,6 +55,10 @@
     }
   },
   "issues": {
+    "deprecated_yaml_import_issue_unavailable_host": {
+      "description": "Configuring {integration_title} using YAML is being removed but there was a connection error while trying to import the YAML configuration.\n\nEnsure your OpenEVSE charger is accessible and restart Home Assistant to try again.",
+      "title": "The {integration_title} YAML configuration import failed"
+    },
     "yaml_deprecated": {
       "description": "Configuring OpenEVSE using YAML is being removed. Your existing YAML configuration has been imported into the UI automatically. Remove the `openevse` configuration from your configuration.yaml file and restart Home Assistant to fix this issue.",
       "title": "OpenEVSE YAML configuration is deprecated"
diff --git a/tests/components/openevse/test_init.py b/tests/components/openevse/test_init.py
new file mode 100644
index 00000000000..5d99806abc0
--- /dev/null
+++ b/tests/components/openevse/test_init.py
@@ -0,0 +1,41 @@
+"""Tests for the OpenEVSE integration."""
+
+from unittest.mock import MagicMock
+
+from homeassistant.config_entries import ConfigEntryState
+from homeassistant.core import HomeAssistant
+
+from tests.common import MockConfigEntry
+
+
+async def test_setup_entry_timeout(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_charger: MagicMock,
+) -> None:
+    """Test setup entry raises ConfigEntryNotReady on timeout."""
+    mock_charger.test_and_get.side_effect = TimeoutError
+
+    mock_config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.SETUP_RETRY
+
+
+async def test_unload_entry(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_charger: MagicMock,
+) -> None:
+    """Test unload entry."""
+    mock_config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.LOADED
+
+    await hass.config_entries.async_unload(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    assert mock_config_entry.state is ConfigEntryState.NOT_LOADED
diff --git a/tests/components/openevse/test_sensor.py b/tests/components/openevse/test_sensor.py
index eed1f45afbc..67a656bf0d9 100644
--- a/tests/components/openevse/test_sensor.py
+++ b/tests/components/openevse/test_sensor.py
@@ -5,8 +5,12 @@ from unittest.mock import MagicMock
 import pytest
 from syrupy.assertion import SnapshotAssertion
 
+from homeassistant.components.openevse.const import DOMAIN
+from homeassistant.components.sensor import DOMAIN as SENSOR_DOMAIN
+from homeassistant.const import CONF_HOST, STATE_UNAVAILABLE
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers import entity_registry as er
+from homeassistant.helpers import entity_registry as er, issue_registry as ir
+from homeassistant.setup import async_setup_component
 
 from tests.common import MockConfigEntry, snapshot_platform
 
@@ -51,3 +55,89 @@ async def test_disabled_by_default_entities(
     assert entry
     assert entry.disabled
     assert entry.disabled_by is er.RegistryEntryDisabler.INTEGRATION
+
+
+async def test_sensor_unavailable_on_coordinator_timeout(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_charger: MagicMock,
+) -> None:
+    """Test sensors become unavailable when coordinator times out."""
+    mock_config_entry.add_to_hass(hass)
+    await hass.config_entries.async_setup(mock_config_entry.entry_id)
+    await hass.async_block_till_done()
+
+    state = hass.states.get("sensor.openevse_mock_config_charging_status")
+    assert state
+    assert state.state != STATE_UNAVAILABLE
+
+    mock_charger.update.side_effect = TimeoutError("Connection timed out")
+    await mock_config_entry.runtime_data.async_refresh()
+    await hass.async_block_till_done()
+
+    state = hass.states.get("sensor.openevse_mock_config_charging_status")
+    assert state
+    assert state.state == STATE_UNAVAILABLE
+
+
+async def test_yaml_import_success(
+    hass: HomeAssistant,
+    mock_charger: MagicMock,
+    issue_registry: ir.IssueRegistry,
+) -> None:
+    """Test successful YAML import creates deprecated_yaml issue."""
+    assert await async_setup_component(
+        hass,
+        SENSOR_DOMAIN,
+        {SENSOR_DOMAIN: {"platform": DOMAIN, CONF_HOST: "192.168.1.100"}},
+    )
+    await hass.async_block_till_done()
+
+    issue = issue_registry.async_get_issue("homeassistant", "deprecated_yaml")
+    assert issue is not None
+    assert issue.issue_domain == DOMAIN
+
+
+async def test_yaml_import_unavailable_host(
+    hass: HomeAssistant,
+    mock_charger: MagicMock,
+    issue_registry: ir.IssueRegistry,
+) -> None:
+    """Test YAML import with unavailable host creates domain-specific issue."""
+    mock_charger.test_and_get.side_effect = TimeoutError("Connection timed out")
+
+    assert await async_setup_component(
+        hass,
+        SENSOR_DOMAIN,
+        {SENSOR_DOMAIN: {"platform": DOMAIN, CONF_HOST: "192.168.1.100"}},
+    )
+    await hass.async_block_till_done()
+
+    issue = issue_registry.async_get_issue(
+        DOMAIN, "deprecated_yaml_import_issue_unavailable_host"
+    )
+    assert issue is not None
+
+
+async def test_yaml_import_already_configured(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_charger: MagicMock,
+    issue_registry: ir.IssueRegistry,
+) -> None:
+    """Test YAML import when already configured creates deprecated_yaml issue."""
+    # Only add the entry, don't set it up - this allows the YAML platform setup
+    # to run while the config flow will still see the existing entry
+    mock_config_entry.add_to_hass(hass)
+
+    assert await async_setup_component(
+        hass,
+        SENSOR_DOMAIN,
+        {SENSOR_DOMAIN: {"platform": DOMAIN, CONF_HOST: "192.168.1.100"}},
+    )
+    await hass.async_block_till_done()
+
+    # When already configured, it should still create deprecated_yaml issue
+    issue = issue_registry.async_get_issue("homeassistant", "deprecated_yaml")
+    assert issue is not None
+    assert issue.issue_domain == DOMAIN