diff --git a/homeassistant/components/modern_forms/binary_sensor.py b/homeassistant/components/modern_forms/binary_sensor.py
index e9aa1ab19eca..075cb7d4e14f 100644
--- a/homeassistant/components/modern_forms/binary_sensor.py
+++ b/homeassistant/components/modern_forms/binary_sensor.py
@@ -20,16 +20,19 @@ async def async_setup_entry(
     """Set up Modern Forms binary sensors."""
     coordinator = entry.runtime_data
 
-    binary_sensors: list[ModernFormsBinarySensor] = [
-        ModernFormsFanSleepTimerActive(entry.entry_id, coordinator),
-    ]
+    binary_sensors: list[ModernFormsBinarySensor] = []
 
-    # Only setup light sleep timer sensor if light unit installed
-    if coordinator.data.info.light_type:
+    if coordinator.data.has_sleep_timer():
         binary_sensors.append(
-            ModernFormsLightSleepTimerActive(entry.entry_id, coordinator)
+            ModernFormsFanSleepTimerActive(entry.entry_id, coordinator)
         )
 
+        # Only setup light sleep timer sensor if light unit installed
+        if coordinator.data.info.light_type:
+            binary_sensors.append(
+                ModernFormsLightSleepTimerActive(entry.entry_id, coordinator)
+            )
+
     async_add_entities(binary_sensors)
 
 
diff --git a/homeassistant/components/modern_forms/fan.py b/homeassistant/components/modern_forms/fan.py
index 5fad755792f4..e072bcb1bedf 100644
--- a/homeassistant/components/modern_forms/fan.py
+++ b/homeassistant/components/modern_forms/fan.py
@@ -7,6 +7,7 @@ import voluptuous as vol
 
 from homeassistant.components.fan import FanEntity, FanEntityFeature
 from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers import entity_platform
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 from homeassistant.util.percentage import (
@@ -19,6 +20,7 @@ from . import modernforms_exception_handler
 from .const import (
     ATTR_SLEEP_TIME,
     CLEAR_TIMER,
+    DOMAIN,
     OPT_ON,
     OPT_SPEED,
     OPT_WIND,
@@ -186,6 +188,11 @@ class ModernFormsFanEntity(FanEntity, ModernFormsDeviceEntity):
         sleep_time: int,
     ) -> None:
         """Set a Modern Forms light sleep timer."""
+        if not self.coordinator.data.has_sleep_timer():
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="sleep_timer_not_supported",
+            )
         await self.coordinator.modern_forms.fan(sleep=sleep_time * 60)
 
     @modernforms_exception_handler
@@ -193,4 +200,9 @@ class ModernFormsFanEntity(FanEntity, ModernFormsDeviceEntity):
         self,
     ) -> None:
         """Clear a Modern Forms fan sleep timer."""
+        if not self.coordinator.data.has_sleep_timer():
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="sleep_timer_not_supported",
+            )
         await self.coordinator.modern_forms.fan(sleep=CLEAR_TIMER)
diff --git a/homeassistant/components/modern_forms/light.py b/homeassistant/components/modern_forms/light.py
index 04707bd459a3..62ab29edfdc0 100644
--- a/homeassistant/components/modern_forms/light.py
+++ b/homeassistant/components/modern_forms/light.py
@@ -8,6 +8,7 @@ import voluptuous as vol
 
 from homeassistant.components.light import ATTR_BRIGHTNESS, ColorMode, LightEntity
 from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers import entity_platform
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 from homeassistant.util.percentage import (
@@ -19,6 +20,7 @@ from . import modernforms_exception_handler
 from .const import (
     ATTR_SLEEP_TIME,
     CLEAR_TIMER,
+    DOMAIN,
     OPT_BRIGHTNESS,
     OPT_ON,
     SERVICE_CLEAR_LIGHT_SLEEP_TIMER,
@@ -159,6 +161,11 @@ class ModernFormsLightEntity(ModernFormsDeviceEntity, LightEntity):
         sleep_time: int,
     ) -> None:
         """Set a Modern Forms light sleep timer."""
+        if not self.coordinator.data.has_sleep_timer():
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="sleep_timer_not_supported",
+            )
         await self._async_control_light(sleep=sleep_time * 60)
 
     @modernforms_exception_handler
@@ -166,6 +173,11 @@ class ModernFormsLightEntity(ModernFormsDeviceEntity, LightEntity):
         self,
     ) -> None:
         """Clear a Modern Forms light sleep timer."""
+        if not self.coordinator.data.has_sleep_timer():
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="sleep_timer_not_supported",
+            )
         await self._async_control_light(sleep=CLEAR_TIMER)
 
     async def _async_control_light(self, **kwargs: Any) -> None:
diff --git a/homeassistant/components/modern_forms/sensor.py b/homeassistant/components/modern_forms/sensor.py
index 8ba086d4dfe0..ee8b0d61ab8c 100644
--- a/homeassistant/components/modern_forms/sensor.py
+++ b/homeassistant/components/modern_forms/sensor.py
@@ -22,16 +22,19 @@ async def async_setup_entry(
     """Set up Modern Forms sensor based on a config entry."""
     coordinator = entry.runtime_data
 
-    sensors: list[ModernFormsSensor] = [
-        ModernFormsFanTimerRemainingTimeSensor(entry.entry_id, coordinator),
-    ]
+    sensors: list[ModernFormsSensor] = []
 
-    # Only setup light sleep timer sensor if light unit installed
-    if coordinator.data.info.light_type:
+    if coordinator.data.has_sleep_timer():
         sensors.append(
-            ModernFormsLightTimerRemainingTimeSensor(entry.entry_id, coordinator)
+            ModernFormsFanTimerRemainingTimeSensor(entry.entry_id, coordinator)
         )
 
+        # Only setup light sleep timer sensor if light unit installed
+        if coordinator.data.info.light_type:
+            sensors.append(
+                ModernFormsLightTimerRemainingTimeSensor(entry.entry_id, coordinator)
+            )
+
     async_add_entities(sensors)
 
 
diff --git a/homeassistant/components/modern_forms/strings.json b/homeassistant/components/modern_forms/strings.json
index 0e864abda3f2..2cf7ed00be98 100644
--- a/homeassistant/components/modern_forms/strings.json
+++ b/homeassistant/components/modern_forms/strings.json
@@ -71,6 +71,9 @@
     },
     "invalid_response": {
       "message": "Invalid response from the Modern Forms device"
+    },
+    "sleep_timer_not_supported": {
+      "message": "This fan does not support sleep timers"
     }
   },
   "services": {
diff --git a/homeassistant/components/modern_forms/switch.py b/homeassistant/components/modern_forms/switch.py
index 93a59d83657b..f08a6bdef400 100644
--- a/homeassistant/components/modern_forms/switch.py
+++ b/homeassistant/components/modern_forms/switch.py
@@ -19,10 +19,13 @@ async def async_setup_entry(
     """Set up Modern Forms switch based on a config entry."""
     coordinator = entry.runtime_data
 
-    switches = [
+    switches: list[ModernFormsSwitch] = [
         ModernFormsAwaySwitch(entry.entry_id, coordinator),
-        ModernFormsAdaptiveLearningSwitch(entry.entry_id, coordinator),
     ]
+
+    if coordinator.data.has_adaptive_learning():
+        switches.append(ModernFormsAdaptiveLearningSwitch(entry.entry_id, coordinator))
+
     async_add_entities(switches)
 
 
diff --git a/tests/components/modern_forms/test_binary_sensor.py b/tests/components/modern_forms/test_binary_sensor.py
index a605b86d4844..9717c507b842 100644
--- a/tests/components/modern_forms/test_binary_sensor.py
+++ b/tests/components/modern_forms/test_binary_sensor.py
@@ -5,7 +5,7 @@ from homeassistant.components.modern_forms.const import DOMAIN
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers import entity_registry as er
 
-from . import init_integration
+from . import init_integration, init_integration_gen4
 
 from tests.test_util.aiohttp import AiohttpClientMocker
 
@@ -43,3 +43,26 @@ async def test_binary_sensors(
     state = hass.states.get("binary_sensor.modernformsfan_fan_sleep_timer_active")
     assert state
     assert state.state == "off"
+
+
+async def test_no_sleep_timer_binary_sensors_on_gen4(
+    hass: HomeAssistant,
+    entity_registry: er.EntityRegistry,
+    aioclient_mock: AiohttpClientMocker,
+) -> None:
+    """Test the sleep-timer binary sensors aren't created for Gen4 fans."""
+    await init_integration_gen4(hass, aioclient_mock)
+
+    # Both entities are disabled by default, so checking hass.states here
+    # wouldn't distinguish "not created" from "created but disabled" --
+    # check the entity registry instead.
+    assert (
+        entity_registry.async_get("binary_sensor.modernformsfan_fan_sleep_timer_active")
+        is None
+    )
+    assert (
+        entity_registry.async_get(
+            "binary_sensor.modernformsfan_light_sleep_timer_active"
+        )
+        is None
+    )
diff --git a/tests/components/modern_forms/test_fan.py b/tests/components/modern_forms/test_fan.py
index f81ce39dba81..8400cc6ad824 100644
--- a/tests/components/modern_forms/test_fan.py
+++ b/tests/components/modern_forms/test_fan.py
@@ -43,6 +43,7 @@ from homeassistant.helpers import entity_registry as er
 
 from . import (
     init_integration,
+    init_integration_gen4,
     modern_forms_breeze_active_call_mock,
     modern_forms_breeze_call_mock,
 )
@@ -395,3 +396,41 @@ async def test_turn_off_does_not_touch_wind(
         )
         await hass.async_block_till_done()
         fan_mock.assert_called_once_with(on=False)
+
+
+async def test_fan_sleep_timer_not_supported_gen4(
+    hass: HomeAssistant,
+    aioclient_mock: AiohttpClientMocker,
+) -> None:
+    """Test setting a sleep timer on a Gen4 fan raises an error."""
+    await init_integration_gen4(hass, aioclient_mock)
+
+    with pytest.raises(HomeAssistantError) as exc_info:
+        await hass.services.async_call(
+            DOMAIN,
+            SERVICE_SET_FAN_SLEEP_TIMER,
+            {ATTR_ENTITY_ID: "fan.modernformsfan_fan", ATTR_SLEEP_TIME: 1},
+            blocking=True,
+        )
+
+    assert exc_info.value.translation_domain == DOMAIN
+    assert exc_info.value.translation_key == "sleep_timer_not_supported"
+
+
+async def test_clear_fan_sleep_timer_not_supported_gen4(
+    hass: HomeAssistant,
+    aioclient_mock: AiohttpClientMocker,
+) -> None:
+    """Test clearing a sleep timer on a Gen4 fan raises an error."""
+    await init_integration_gen4(hass, aioclient_mock)
+
+    with pytest.raises(HomeAssistantError) as exc_info:
+        await hass.services.async_call(
+            DOMAIN,
+            SERVICE_CLEAR_FAN_SLEEP_TIMER,
+            {ATTR_ENTITY_ID: "fan.modernformsfan_fan"},
+            blocking=True,
+        )
+
+    assert exc_info.value.translation_domain == DOMAIN
+    assert exc_info.value.translation_key == "sleep_timer_not_supported"
diff --git a/tests/components/modern_forms/test_light.py b/tests/components/modern_forms/test_light.py
index f7e4b5e98013..300db5bde54f 100644
--- a/tests/components/modern_forms/test_light.py
+++ b/tests/components/modern_forms/test_light.py
@@ -326,28 +326,39 @@ async def test_light_change_state_gen4(
         light_mock.assert_not_called()
 
 
-async def test_sleep_timer_services_gen4(
-    hass: HomeAssistant, aioclient_mock: AiohttpClientMocker
+async def test_light_sleep_timer_not_supported_gen4(
+    hass: HomeAssistant,
+    aioclient_mock: AiohttpClientMocker,
 ) -> None:
-    """Test Gen4 sleep timer services pass sleep through light_fixture()."""
+    """Test setting a sleep timer on a Gen4 light fixture raises an error."""
     await init_integration_gen4(hass, aioclient_mock)
 
-    with patch("aiomodernforms.ModernFormsDevice.light_fixture") as light_fixture_mock:
+    with pytest.raises(HomeAssistantError) as exc_info:
         await hass.services.async_call(
             DOMAIN,
             SERVICE_SET_LIGHT_SLEEP_TIMER,
             {ATTR_ENTITY_ID: "light.modernformsfan_uplight", ATTR_SLEEP_TIME: 1},
             blocking=True,
         )
-        await hass.async_block_till_done()
-        light_fixture_mock.assert_called_once_with(2, sleep=60)
 
-    with patch("aiomodernforms.ModernFormsDevice.light_fixture") as light_fixture_mock:
+    assert exc_info.value.translation_domain == DOMAIN
+    assert exc_info.value.translation_key == "sleep_timer_not_supported"
+
+
+async def test_clear_light_sleep_timer_not_supported_gen4(
+    hass: HomeAssistant,
+    aioclient_mock: AiohttpClientMocker,
+) -> None:
+    """Test clearing a sleep timer on a Gen4 light fixture raises an error."""
+    await init_integration_gen4(hass, aioclient_mock)
+
+    with pytest.raises(HomeAssistantError) as exc_info:
         await hass.services.async_call(
             DOMAIN,
             SERVICE_CLEAR_LIGHT_SLEEP_TIMER,
             {ATTR_ENTITY_ID: "light.modernformsfan_uplight"},
             blocking=True,
         )
-        await hass.async_block_till_done()
-        light_fixture_mock.assert_called_once_with(2, sleep=0)
+
+    assert exc_info.value.translation_domain == DOMAIN
+    assert exc_info.value.translation_key == "sleep_timer_not_supported"
diff --git a/tests/components/modern_forms/test_sensor.py b/tests/components/modern_forms/test_sensor.py
index 9058808443ef..65f5370dc949 100644
--- a/tests/components/modern_forms/test_sensor.py
+++ b/tests/components/modern_forms/test_sensor.py
@@ -6,7 +6,7 @@ from homeassistant.components.sensor import SensorDeviceClass
 from homeassistant.const import ATTR_DEVICE_CLASS
 from homeassistant.core import HomeAssistant
 
-from . import init_integration, modern_forms_timers_set_mock
+from . import init_integration, init_integration_gen4, modern_forms_timers_set_mock
 
 from tests.test_util.aiohttp import AiohttpClientMocker
 
@@ -51,3 +51,14 @@ async def test_active_sensors(
     assert state
     assert state.attributes.get(ATTR_DEVICE_CLASS) == SensorDeviceClass.TIMESTAMP
     datetime.fromisoformat(state.state)
+
+
+async def test_no_sleep_timer_sensors_on_gen4(
+    hass: HomeAssistant,
+    aioclient_mock: AiohttpClientMocker,
+) -> None:
+    """Test the sleep-timer sensors aren't created for Gen4 fans."""
+    await init_integration_gen4(hass, aioclient_mock)
+
+    assert hass.states.get("sensor.modernformsfan_fan_sleep_time") is None
+    assert hass.states.get("sensor.modernformsfan_light_sleep_time") is None
diff --git a/tests/components/modern_forms/test_switch.py b/tests/components/modern_forms/test_switch.py
index 3ba6305dfcff..cd80778cd6cf 100644
--- a/tests/components/modern_forms/test_switch.py
+++ b/tests/components/modern_forms/test_switch.py
@@ -18,7 +18,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers import entity_registry as er
 
-from . import init_integration
+from . import init_integration, init_integration_gen4
 
 from tests.test_util.aiohttp import AiohttpClientMocker
 
@@ -156,3 +156,14 @@ async def test_switch_connection_error(
 
     state = hass.states.get("switch.modernformsfan_away_mode")
     assert state.state == STATE_UNAVAILABLE
+
+
+async def test_no_adaptive_learning_switch_on_gen4(
+    hass: HomeAssistant,
+    aioclient_mock: AiohttpClientMocker,
+) -> None:
+    """Test the adaptive learning switch isn't created for Gen4 fans."""
+    await init_integration_gen4(hass, aioclient_mock)
+
+    assert hass.states.get("switch.modernformsfan_adaptive_learning") is None
+    assert hass.states.get("switch.modernformsfan_away_mode") is not None