diff --git a/tests/components/flexit_bacnet/test_climate.py b/tests/components/flexit_bacnet/test_climate.py
index 79ee84bdc14..5baac1c5077 100644
--- a/tests/components/flexit_bacnet/test_climate.py
+++ b/tests/components/flexit_bacnet/test_climate.py
@@ -2,9 +2,17 @@
 
 from unittest.mock import AsyncMock
 
+from flexit_bacnet import VENTILATION_MODE_AWAY, VENTILATION_MODE_HOME
 from syrupy.assertion import SnapshotAssertion
 
-from homeassistant.const import Platform
+from homeassistant.components.climate import (
+    ATTR_PRESET_MODE,
+    PRESET_AWAY,
+    PRESET_HOME,
+    SERVICE_SET_PRESET_MODE,
+)
+from homeassistant.components.flexit_bacnet.const import PRESET_TO_VENTILATION_MODE_MAP
+from homeassistant.const import ATTR_ENTITY_ID, Platform
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import entity_registry as er
 
@@ -12,6 +20,8 @@ from . import setup_with_selected_platforms
 
 from tests.common import MockConfigEntry, snapshot_platform
 
+ENTITY_ID = "climate.device_name"
+
 
 async def test_climate_entity(
     hass: HomeAssistant,
@@ -24,3 +34,50 @@ async def test_climate_entity(
     await setup_with_selected_platforms(hass, mock_config_entry, [Platform.CLIMATE])
 
     await snapshot_platform(hass, entity_registry, snapshot, mock_config_entry.entry_id)
+
+
+async def test_set_hvac_preset_mode(
+    hass: HomeAssistant,
+    mock_flexit_bacnet: AsyncMock,
+    mock_config_entry: MockConfigEntry,
+) -> None:
+    """Test the initial parameters."""
+    await setup_with_selected_platforms(hass, mock_config_entry, [Platform.CLIMATE])
+
+    # Set preset mode to away
+    mock_flexit_bacnet.ventilation_mode = VENTILATION_MODE_AWAY
+    await hass.services.async_call(
+        Platform.CLIMATE,
+        SERVICE_SET_PRESET_MODE,
+        {
+            ATTR_ENTITY_ID: ENTITY_ID,
+            ATTR_PRESET_MODE: PRESET_AWAY,
+        },
+        blocking=True,
+    )
+
+    state = hass.states.get(ENTITY_ID)
+    assert state.attributes[ATTR_PRESET_MODE] == PRESET_AWAY
+
+    mock_flexit_bacnet.set_ventilation_mode.assert_called_once_with(
+        PRESET_TO_VENTILATION_MODE_MAP[PRESET_AWAY]
+    )
+
+    # Set preset mode to home
+    mock_flexit_bacnet.ventilation_mode = VENTILATION_MODE_HOME
+    await hass.services.async_call(
+        Platform.CLIMATE,
+        SERVICE_SET_PRESET_MODE,
+        {
+            ATTR_ENTITY_ID: ENTITY_ID,
+            ATTR_PRESET_MODE: PRESET_HOME,
+        },
+        blocking=True,
+    )
+
+    state = hass.states.get(ENTITY_ID)
+    assert state.attributes[ATTR_PRESET_MODE] == PRESET_HOME
+
+    mock_flexit_bacnet.set_ventilation_mode.assert_called_with(
+        PRESET_TO_VENTILATION_MODE_MAP[PRESET_HOME]
+    )