diff --git a/tests/components/tuya/test_number.py b/tests/components/tuya/test_number.py
index 7da514964aa..26b853c2879 100644
--- a/tests/components/tuya/test_number.py
+++ b/tests/components/tuya/test_number.py
@@ -8,9 +8,11 @@ import pytest
 from syrupy.assertion import SnapshotAssertion
 from tuya_sharing import CustomerDevice
 
+from homeassistant.components.number import DOMAIN as NUMBER_DOMAIN, SERVICE_SET_VALUE
 from homeassistant.components.tuya import ManagerCompat
 from homeassistant.const import Platform
 from homeassistant.core import HomeAssistant
+from homeassistant.exceptions import ServiceValidationError
 from homeassistant.helpers import entity_registry as er
 
 from . import DEVICE_MOCKS, initialize_entry
@@ -53,3 +55,67 @@ async def test_platform_setup_no_discovery(
     assert not er.async_entries_for_config_entry(
         entity_registry, mock_config_entry.entry_id
     )
+
+
+@pytest.mark.parametrize(
+    "mock_device_code",
+    ["mal_alarm_host"],
+)
+async def test_set_value(
+    hass: HomeAssistant,
+    mock_manager: ManagerCompat,
+    mock_config_entry: MockConfigEntry,
+    mock_device: CustomerDevice,
+) -> None:
+    """Test set value."""
+    entity_id = "number.multifunction_alarm_arm_delay"
+    await initialize_entry(hass, mock_manager, mock_config_entry, mock_device)
+
+    state = hass.states.get(entity_id)
+    assert state is not None, f"{entity_id} does not exist"
+    await hass.services.async_call(
+        NUMBER_DOMAIN,
+        SERVICE_SET_VALUE,
+        {
+            "entity_id": entity_id,
+            "value": 18,
+        },
+    )
+    await hass.async_block_till_done()
+    mock_manager.send_commands.assert_called_once_with(
+        mock_device.id, [{"code": "delay_set", "value": 18}]
+    )
+
+
+@pytest.mark.parametrize(
+    "mock_device_code",
+    ["mal_alarm_host"],
+)
+async def test_set_value_no_function(
+    hass: HomeAssistant,
+    mock_manager: ManagerCompat,
+    mock_config_entry: MockConfigEntry,
+    mock_device: CustomerDevice,
+) -> None:
+    """Test set value when no function available."""
+
+    # Mock a device with delay_set in status but not in function or status_range
+    mock_device.function.pop("delay_set")
+    mock_device.status_range.pop("delay_set")
+
+    entity_id = "number.multifunction_alarm_arm_delay"
+    await initialize_entry(hass, mock_manager, mock_config_entry, mock_device)
+
+    state = hass.states.get(entity_id)
+    assert state is not None, f"{entity_id} does not exist"
+    with pytest.raises(ServiceValidationError) as err:
+        await hass.services.async_call(
+            NUMBER_DOMAIN,
+            SERVICE_SET_VALUE,
+            {
+                "entity_id": entity_id,
+                "value": 18,
+            },
+            blocking=True,
+        )
+    assert err.value.translation_key == "action_dpcode_not_found"