diff --git a/homeassistant/components/actron_air/config_flow.py b/homeassistant/components/actron_air/config_flow.py
index d882424ef01..3faefe7590f 100644
--- a/homeassistant/components/actron_air/config_flow.py
+++ b/homeassistant/components/actron_air/config_flow.py
@@ -120,7 +120,7 @@ class ActronAirConfigFlow(ConfigFlow, domain=DOMAIN):
             return self.async_show_form(
                 step_id="timeout",
             )
-        del self.login_task
+        self.login_task = None
         return await self.async_step_user()
 
     async def async_step_reauth(
diff --git a/homeassistant/components/actron_air/manifest.json b/homeassistant/components/actron_air/manifest.json
index 6fe0f14bb24..724ff101cb9 100644
--- a/homeassistant/components/actron_air/manifest.json
+++ b/homeassistant/components/actron_air/manifest.json
@@ -12,6 +12,6 @@
   "documentation": "https://www.home-assistant.io/integrations/actron_air",
   "integration_type": "hub",
   "iot_class": "cloud_polling",
-  "quality_scale": "bronze",
+  "quality_scale": "silver",
   "requirements": ["actron-neo-api==0.4.1"]
 }
diff --git a/homeassistant/components/actron_air/quality_scale.yaml b/homeassistant/components/actron_air/quality_scale.yaml
index cb608240459..240b3e4b185 100644
--- a/homeassistant/components/actron_air/quality_scale.yaml
+++ b/homeassistant/components/actron_air/quality_scale.yaml
@@ -37,7 +37,7 @@ rules:
   log-when-unavailable: done
   parallel-updates: done
   reauthentication-flow: done
-  test-coverage: todo
+  test-coverage: done
 
   # Gold
   devices: done
diff --git a/tests/components/actron_air/test_climate.py b/tests/components/actron_air/test_climate.py
index da471a3154a..61262dcc850 100644
--- a/tests/components/actron_air/test_climate.py
+++ b/tests/components/actron_air/test_climate.py
@@ -258,3 +258,61 @@ async def test_zone_set_hvac_mode_api_error(
             {ATTR_ENTITY_ID: "climate.living_room", ATTR_HVAC_MODE: HVACMode.OFF},
             blocking=True,
         )
+
+
+async def test_system_hvac_mode_unmapped(
+    hass: HomeAssistant,
+    mock_actron_api: MagicMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test system climate entity returns None for unmapped HVAC mode."""
+    status = mock_actron_api.state_manager.get_status.return_value
+    status.user_aircon_settings.is_on = True
+    status.user_aircon_settings.mode = "UNKNOWN_MODE"
+
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get("climate.test_system")
+    assert state.state == "unknown"
+
+
+async def test_zone_hvac_mode_unmapped(
+    hass: HomeAssistant,
+    mock_actron_api: MagicMock,
+    mock_config_entry: MockConfigEntry,
+    mock_zone: MagicMock,
+) -> None:
+    """Test zone climate entity returns None for unmapped HVAC mode."""
+    mock_zone.is_active = True
+    mock_zone.hvac_mode = "UNKNOWN_MODE"
+
+    status = mock_actron_api.state_manager.get_status.return_value
+    status.remote_zone_info = [mock_zone]
+    status.zones = {1: mock_zone}
+
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get("climate.living_room")
+    assert state.state == "unknown"
+
+
+async def test_zone_hvac_mode_inactive(
+    hass: HomeAssistant,
+    mock_actron_api: MagicMock,
+    mock_config_entry: MockConfigEntry,
+    mock_zone: MagicMock,
+) -> None:
+    """Test zone climate entity returns OFF when zone is inactive."""
+    mock_zone.is_active = False
+
+    status = mock_actron_api.state_manager.get_status.return_value
+    status.remote_zone_info = [mock_zone]
+    status.zones = {1: mock_zone}
+
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    state = hass.states.get("climate.living_room")
+    assert state.state == "off"
diff --git a/tests/components/actron_air/test_config_flow.py b/tests/components/actron_air/test_config_flow.py
index 113af461c89..6315304f1f4 100644
--- a/tests/components/actron_air/test_config_flow.py
+++ b/tests/components/actron_air/test_config_flow.py
@@ -252,3 +252,84 @@ async def test_reauth_flow_wrong_account(
     # Should abort because of wrong account
     assert result["type"] is FlowResultType.ABORT
     assert result["reason"] == "wrong_account"
+
+
+async def test_user_flow_timeout(
+    hass: HomeAssistant, mock_actron_api: AsyncMock, mock_setup_entry: AsyncMock
+) -> None:
+    """Test OAuth2 flow when login task raises a non-CannotConnect exception."""
+
+    # Override the default mock to raise a generic exception (not CannotConnect)
+    async def raise_generic_error(device_code):
+        raise RuntimeError("Unexpected error")
+
+    mock_actron_api.poll_for_token = raise_generic_error
+
+    # Start the config flow
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    # Task raises a non-CannotConnect exception, so it goes to timeout
+    assert result["type"] is FlowResultType.SHOW_PROGRESS_DONE
+    assert result["step_id"] == "timeout"
+
+    # Continue to the timeout step
+    result = await hass.config_entries.flow.async_configure(result["flow_id"])
+
+    # Should show the timeout form
+    assert result["type"] is FlowResultType.FORM
+    assert result["step_id"] == "timeout"
+
+    # Now fix the mock to allow successful token polling for recovery
+    async def successful_poll_for_token(device_code):
+        await asyncio.sleep(0.1)
+        return {
+            "access_token": "test_access_token",
+            "refresh_token": "test_refresh_token",
+        }
+
+    mock_actron_api.poll_for_token = successful_poll_for_token
+
+    # User clicks retry button
+    result = await hass.config_entries.flow.async_configure(result["flow_id"], {})
+
+    # Should start progress again
+    assert result["type"] is FlowResultType.SHOW_PROGRESS
+    assert result["step_id"] == "user"
+    assert result["progress_action"] == "wait_for_authorization"
+
+    # Wait for the progress to complete
+    await hass.async_block_till_done()
+
+    # Continue the flow after progress is done
+    result = await hass.config_entries.flow.async_configure(result["flow_id"])
+
+    # Should create entry on successful recovery
+    assert result["type"] is FlowResultType.CREATE_ENTRY
+    assert result["title"] == "test@example.com"
+
+
+async def test_finish_login_auth_error(
+    hass: HomeAssistant, mock_actron_api: AsyncMock, mock_setup_entry: AsyncMock
+) -> None:
+    """Test finish_login step when get_user_info raises ActronAirAuthError."""
+    # Start the config flow
+    result = await hass.config_entries.flow.async_init(
+        DOMAIN, context={"source": config_entries.SOURCE_USER}
+    )
+
+    # Wait for the progress to complete
+    await hass.async_block_till_done()
+
+    # Now make get_user_info fail with auth error
+    mock_actron_api.get_user_info = AsyncMock(
+        side_effect=ActronAirAuthError("Auth error getting user info")
+    )
+
+    # Continue the flow after progress is done
+    result = await hass.config_entries.flow.async_configure(result["flow_id"])
+
+    # Should abort with oauth2_error
+    assert result["type"] is FlowResultType.ABORT
+    assert result["reason"] == "oauth2_error"
diff --git a/tests/components/actron_air/test_coordinator.py b/tests/components/actron_air/test_coordinator.py
new file mode 100644
index 00000000000..f1af0c1c476
--- /dev/null
+++ b/tests/components/actron_air/test_coordinator.py
@@ -0,0 +1,58 @@
+"""Tests for the Actron Air coordinator."""
+
+from unittest.mock import AsyncMock, patch
+
+from actron_neo_api import ActronAirAPIError, ActronAirAuthError
+from freezegun.api import FrozenDateTimeFactory
+
+from homeassistant.components.actron_air.coordinator import SCAN_INTERVAL
+from homeassistant.config_entries import ConfigEntryState
+from homeassistant.const import Platform
+from homeassistant.core import HomeAssistant
+
+from . import setup_integration
+
+from tests.common import MockConfigEntry, async_fire_time_changed
+
+
+async def test_coordinator_update_auth_error(
+    hass: HomeAssistant,
+    mock_actron_api: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+    freezer: FrozenDateTimeFactory,
+) -> None:
+    """Test coordinator handles auth error during update."""
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    assert mock_config_entry.state is ConfigEntryState.LOADED
+
+    mock_actron_api.update_status.side_effect = ActronAirAuthError("Auth expired")
+
+    freezer.tick(SCAN_INTERVAL)
+    async_fire_time_changed(hass)
+    await hass.async_block_till_done()
+
+    # ConfigEntryAuthFailed triggers a reauth flow
+    assert len(hass.config_entries.flow.async_progress()) == 1
+
+
+async def test_coordinator_update_api_error(
+    hass: HomeAssistant,
+    mock_actron_api: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+    freezer: FrozenDateTimeFactory,
+) -> None:
+    """Test coordinator handles API error during update."""
+    with patch("homeassistant.components.actron_air.PLATFORMS", [Platform.CLIMATE]):
+        await setup_integration(hass, mock_config_entry)
+
+    mock_actron_api.update_status.side_effect = ActronAirAPIError("API error")
+
+    freezer.tick(SCAN_INTERVAL)
+    async_fire_time_changed(hass)
+    await hass.async_block_till_done()
+
+    # UpdateFailed sets last_update_success to False on the coordinator
+    coordinator = list(mock_config_entry.runtime_data.system_coordinators.values())[0]
+    assert coordinator.last_update_success is False
diff --git a/tests/components/actron_air/test_init.py b/tests/components/actron_air/test_init.py
new file mode 100644
index 00000000000..5a13dd61853
--- /dev/null
+++ b/tests/components/actron_air/test_init.py
@@ -0,0 +1,38 @@
+"""Tests for the Actron Air integration setup."""
+
+from unittest.mock import AsyncMock
+
+from actron_neo_api import ActronAirAPIError, ActronAirAuthError
+
+from homeassistant.config_entries import ConfigEntryState
+from homeassistant.core import HomeAssistant
+
+from . import setup_integration
+
+from tests.common import MockConfigEntry
+
+
+async def test_setup_entry_auth_error(
+    hass: HomeAssistant,
+    mock_actron_api: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test setup entry raises ConfigEntryAuthFailed on auth error."""
+    mock_actron_api.get_ac_systems.side_effect = ActronAirAuthError("Auth failed")
+
+    await setup_integration(hass, mock_config_entry)
+
+    assert mock_config_entry.state is ConfigEntryState.SETUP_ERROR
+
+
+async def test_setup_entry_api_error(
+    hass: HomeAssistant,
+    mock_actron_api: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test setup entry raises ConfigEntryNotReady on API error."""
+    mock_actron_api.get_ac_systems.side_effect = ActronAirAPIError("API failed")
+
+    await setup_integration(hass, mock_config_entry)
+
+    assert mock_config_entry.state is ConfigEntryState.SETUP_RETRY