diff --git a/homeassistant/components/duco/fan.py b/homeassistant/components/duco/fan.py
index 480f2381d125e2..612156abbd1d45 100644
--- a/homeassistant/components/duco/fan.py
+++ b/homeassistant/components/duco/fan.py
@@ -27,6 +27,10 @@
 ]
 
 PRESET_AUTO = "auto"
+PRESET_MAN1 = "man1"
+PRESET_MAN2 = "man2"
+PRESET_MAN3 = "man3"
+PRESET_EMPT = "empt"
 
 # Upper-bound percentages for 3 speed levels: 33 / 66 / 100.
 # Using upper bounds guarantees that reading a percentage back and writing it
@@ -36,21 +40,35 @@
     for i, _ in enumerate(ORDERED_NAMED_FAN_SPEEDS)
 ]
 
-# Maps every active Duco state (including timed MAN variants) to its
-# display percentage so externally-set timed modes show the correct level.
 _STATE_TO_PERCENTAGE: dict[VentilationState, int] = {
     VentilationState.CNT1: _SPEED_LEVEL_PERCENTAGES[0],
-    VentilationState.MAN1: _SPEED_LEVEL_PERCENTAGES[0],
-    VentilationState.MAN1x2: _SPEED_LEVEL_PERCENTAGES[0],
-    VentilationState.MAN1x3: _SPEED_LEVEL_PERCENTAGES[0],
     VentilationState.CNT2: _SPEED_LEVEL_PERCENTAGES[1],
-    VentilationState.MAN2: _SPEED_LEVEL_PERCENTAGES[1],
-    VentilationState.MAN2x2: _SPEED_LEVEL_PERCENTAGES[1],
-    VentilationState.MAN2x3: _SPEED_LEVEL_PERCENTAGES[1],
     VentilationState.CNT3: _SPEED_LEVEL_PERCENTAGES[2],
-    VentilationState.MAN3: _SPEED_LEVEL_PERCENTAGES[2],
-    VentilationState.MAN3x2: _SPEED_LEVEL_PERCENTAGES[2],
-    VentilationState.MAN3x3: _SPEED_LEVEL_PERCENTAGES[2],
+}
+
+_STATE_TO_PRESET: dict[VentilationState, str] = {
+    VentilationState.AUTO: PRESET_AUTO,
+    VentilationState.AUT1: PRESET_AUTO,
+    VentilationState.AUT2: PRESET_AUTO,
+    VentilationState.AUT3: PRESET_AUTO,
+    VentilationState.MAN1: PRESET_MAN1,
+    VentilationState.MAN1x2: PRESET_MAN1,
+    VentilationState.MAN1x3: PRESET_MAN1,
+    VentilationState.MAN2: PRESET_MAN2,
+    VentilationState.MAN2x2: PRESET_MAN2,
+    VentilationState.MAN2x3: PRESET_MAN2,
+    VentilationState.MAN3: PRESET_MAN3,
+    VentilationState.MAN3x2: PRESET_MAN3,
+    VentilationState.MAN3x3: PRESET_MAN3,
+    VentilationState.EMPT: PRESET_EMPT,
+}
+
+_PRESET_TO_STATE: dict[str, VentilationState] = {
+    PRESET_AUTO: VentilationState.AUTO,
+    PRESET_MAN1: VentilationState.MAN1,
+    PRESET_MAN2: VentilationState.MAN2,
+    PRESET_MAN3: VentilationState.MAN3,
+    PRESET_EMPT: VentilationState.EMPT,
 }
 
 
@@ -76,7 +94,13 @@ class DucoVentilationFanEntity(DucoEntity, FanEntity):
     _attr_translation_key = "ventilation"
     _attr_name = None
     _attr_supported_features = FanEntityFeature.SET_SPEED | FanEntityFeature.PRESET_MODE
-    _attr_preset_modes = [PRESET_AUTO]
+    _attr_preset_modes = [
+        PRESET_AUTO,
+        PRESET_MAN1,
+        PRESET_MAN2,
+        PRESET_MAN3,
+        PRESET_EMPT,
+    ]
     _attr_speed_count = len(ORDERED_NAMED_FAN_SPEEDS)
 
     def __init__(self, coordinator: DucoCoordinator, node: Node) -> None:
@@ -86,7 +110,7 @@ def __init__(self, coordinator: DucoCoordinator, node: Node) -> None:
 
     @property
     def percentage(self) -> int | None:
-        """Return the current speed as a percentage, or None when in AUTO mode."""
+        """Return the current speed as a percentage, or None when a preset is active."""
         node = self._node
         if node.ventilation is None:
             return None
@@ -94,18 +118,16 @@ def percentage(self) -> int | None:
 
     @property
     def preset_mode(self) -> str | None:
-        """Return the current preset mode (auto when Duco controls, else None)."""
+        """Return the active preset, or None when a CNT speed level is set."""
         node = self._node
         if node.ventilation is None:
             return None
-        if node.ventilation.state not in _STATE_TO_PERCENTAGE:
-            return PRESET_AUTO
-        return None
+        return _STATE_TO_PRESET.get(node.ventilation.state)
 
     async def async_set_preset_mode(self, preset_mode: str) -> None:
-        """Set preset mode: 'auto' hands control back to Duco."""
+        """Set the ventilation preset mode."""
         self._valid_preset_mode_or_raise(preset_mode)
-        await self._async_set_state(VentilationState.AUTO)
+        await self._async_set_state(_PRESET_TO_STATE[preset_mode])
 
     async def async_set_percentage(self, percentage: int) -> None:
         """Set the fan speed as a percentage (maps to low/medium/high)."""
diff --git a/homeassistant/components/duco/strings.json b/homeassistant/components/duco/strings.json
index d44cbef2d044bf..213a47606031b5 100644
--- a/homeassistant/components/duco/strings.json
+++ b/homeassistant/components/duco/strings.json
@@ -40,7 +40,11 @@
         "state_attributes": {
           "preset_mode": {
             "state": {
-              "auto": "[%key:common::state::auto%]"
+              "auto": "[%key:common::state::auto%]",
+              "empt": "Empty house",
+              "man1": "Timed low speed",
+              "man2": "Timed medium speed",
+              "man3": "Timed high speed"
             }
           }
         }
diff --git a/tests/components/duco/snapshots/test_fan.ambr b/tests/components/duco/snapshots/test_fan.ambr
index acbaa0a4d7a2ac..44991b466cd201 100644
--- a/tests/components/duco/snapshots/test_fan.ambr
+++ b/tests/components/duco/snapshots/test_fan.ambr
@@ -8,6 +8,10 @@
     'capabilities': dict({
       'preset_modes': list([
         'auto',
+        'man1',
+        'man2',
+        'man3',
+        'empt',
       ]),
     }),
     'config_entry_id': <ANY>,
@@ -49,6 +53,10 @@
       'preset_mode': 'auto',
       'preset_modes': list([
         'auto',
+        'man1',
+        'man2',
+        'man3',
+        'empt',
       ]),
       'supported_features': <FanEntityFeature: 9>,
     }),
diff --git a/tests/components/duco/test_fan.py b/tests/components/duco/test_fan.py
index 6069fde48004de..89610f352c2dbd 100644
--- a/tests/components/duco/test_fan.py
+++ b/tests/components/duco/test_fan.py
@@ -1,9 +1,15 @@
 """Tests for the Duco fan platform."""
 
-import logging
 from unittest.mock import AsyncMock, patch
 
 from duco.exceptions import DucoConnectionError, DucoError, DucoRateLimitError
+from duco.models import (
+    Node,
+    NodeGeneralInfo,
+    NodeSensorInfo,
+    NodeVentilationInfo,
+    VentilationState,
+)
 from freezegun.api import FrozenDateTimeFactory
 import pytest
 from syrupy.assertion import SnapshotAssertion
@@ -60,6 +66,10 @@ async def test_fan_entity_state(
         (SERVICE_SET_PERCENTAGE, {ATTR_PERCENTAGE: 66}, "CNT2"),
         (SERVICE_SET_PERCENTAGE, {ATTR_PERCENTAGE: 100}, "CNT3"),
         (SERVICE_SET_PRESET_MODE, {ATTR_PRESET_MODE: "auto"}, "AUTO"),
+        (SERVICE_SET_PRESET_MODE, {ATTR_PRESET_MODE: "man1"}, "MAN1"),
+        (SERVICE_SET_PRESET_MODE, {ATTR_PRESET_MODE: "man2"}, "MAN2"),
+        (SERVICE_SET_PRESET_MODE, {ATTR_PRESET_MODE: "man3"}, "MAN3"),
+        (SERVICE_SET_PRESET_MODE, {ATTR_PRESET_MODE: "empt"}, "EMPT"),
     ],
 )
 async def test_fan_set_state(
@@ -84,6 +94,87 @@ async def test_fan_set_state(
     )
 
 
+def _box_node_with_state(state: VentilationState) -> Node:
+    """Return a BOX node fixture with the given ventilation state."""
+    return Node(
+        node_id=1,
+        general=NodeGeneralInfo(
+            node_type="BOX",
+            sub_type=1,
+            network_type="VIRT",
+            parent=0,
+            asso=0,
+            name="Living",
+            identify=0,
+        ),
+        ventilation=NodeVentilationInfo(
+            state=state.value,
+            time_state_remain=0,
+            time_state_end=0,
+            mode="AUTO",
+            flow_lvl_tgt=0,
+        ),
+        sensor=NodeSensorInfo(
+            co2=None,
+            iaq_co2=None,
+            rh=None,
+            iaq_rh=None,
+            temp=27.9,
+        ),
+    )
+
+
+@pytest.mark.parametrize(
+    ("ventilation_state", "expected_preset", "expected_percentage"),
+    [
+        (VentilationState.AUTO, "auto", None),
+        (VentilationState.AUT1, "auto", None),
+        (VentilationState.AUT2, "auto", None),
+        (VentilationState.AUT3, "auto", None),
+        (VentilationState.MAN1, "man1", None),
+        (VentilationState.MAN1x2, "man1", None),
+        (VentilationState.MAN1x3, "man1", None),
+        (VentilationState.MAN2, "man2", None),
+        (VentilationState.MAN2x2, "man2", None),
+        (VentilationState.MAN2x3, "man2", None),
+        (VentilationState.MAN3, "man3", None),
+        (VentilationState.MAN3x2, "man3", None),
+        (VentilationState.MAN3x3, "man3", None),
+        (VentilationState.EMPT, "empt", None),
+        (VentilationState.CNT1, None, 33),
+        (VentilationState.CNT2, None, 66),
+        (VentilationState.CNT3, None, 100),
+    ],
+)
+async def test_fan_read_state(
+    hass: HomeAssistant,
+    mock_config_entry: MockConfigEntry,
+    mock_duco_client: AsyncMock,
+    mock_nodes: list[Node],
+    freezer: FrozenDateTimeFactory,
+    ventilation_state: VentilationState,
+    expected_preset: str | None,
+    expected_percentage: int | None,
+) -> None:
+    """Test that preset_mode and percentage reflect the reported VentilationState."""
+    mock_config_entry.add_to_hass(hass)
+    with patch("homeassistant.components.duco.PLATFORMS", [Platform.FAN]):
+        await hass.config_entries.async_setup(mock_config_entry.entry_id)
+        await hass.async_block_till_done()
+
+    updated_nodes = [_box_node_with_state(ventilation_state), *mock_nodes[1:]]
+    mock_duco_client.async_get_nodes = AsyncMock(return_value=updated_nodes)
+
+    freezer.tick(SCAN_INTERVAL)
+    async_fire_time_changed(hass)
+    await hass.async_block_till_done(wait_background_tasks=True)
+
+    state = hass.states.get(_FAN_ENTITY)
+    assert state is not None
+    assert state.attributes.get("preset_mode") == expected_preset
+    assert state.attributes.get("percentage") == expected_percentage
+
+
 @pytest.mark.usefixtures("init_integration")
 @pytest.mark.parametrize(
     ("exception", "match"),
@@ -122,10 +213,7 @@ async def test_fan_set_state_rate_limit_logs_warning(
         side_effect=DucoRateLimitError()
     )
 
-    with (
-        pytest.raises(HomeAssistantError),
-        caplog.at_level(logging.WARNING, logger="homeassistant.components.duco.fan"),
-    ):
+    with pytest.raises(HomeAssistantError):
         await hass.services.async_call(
             FAN_DOMAIN,
             SERVICE_SET_PERCENTAGE,