diff --git a/homeassistant/components/modbus/__init__.py b/homeassistant/components/modbus/__init__.py
index d6fe41f66fc..fd8e15b9b7e 100644
--- a/homeassistant/components/modbus/__init__.py
+++ b/homeassistant/components/modbus/__init__.py
@@ -136,7 +136,7 @@ BASE_STRUCT_SCHEMA = BASE_COMPONENT_SCHEMA.extend(
             ]
         ),
         vol.Optional(CONF_COUNT): cv.positive_int,
-        vol.Optional(CONF_DATA_TYPE, default=DataType.INT): vol.In(
+        vol.Optional(CONF_DATA_TYPE, default=DataType.INT16): vol.In(
             [
                 DataType.INT8,
                 DataType.INT16,
@@ -150,9 +150,6 @@ BASE_STRUCT_SCHEMA = BASE_COMPONENT_SCHEMA.extend(
                 DataType.FLOAT32,
                 DataType.FLOAT64,
                 DataType.STRING,
-                DataType.INT,
-                DataType.UINT,
-                DataType.FLOAT,
                 DataType.STRING,
                 DataType.CUSTOM,
             ]
diff --git a/homeassistant/components/modbus/const.py b/homeassistant/components/modbus/const.py
index 7244e2a16e6..b09d75f27e0 100644
--- a/homeassistant/components/modbus/const.py
+++ b/homeassistant/components/modbus/const.py
@@ -76,9 +76,6 @@ class DataType(str, Enum):
     """Data types used by sensor etc."""
 
     CUSTOM = "custom"
-    FLOAT = "float"  # deprecated
-    INT = "int"  # deprecated
-    UINT = "uint"  # deprecated
     STRING = "string"
     INT8 = "int8"
     INT16 = "int16"
diff --git a/homeassistant/components/modbus/validators.py b/homeassistant/components/modbus/validators.py
index 4f910043d12..646e1129c4e 100644
--- a/homeassistant/components/modbus/validators.py
+++ b/homeassistant/components/modbus/validators.py
@@ -39,23 +39,6 @@ from .const import (
 
 _LOGGER = logging.getLogger(__name__)
 
-OLD_DATA_TYPES = {
-    DataType.INT: {
-        1: DataType.INT16,
-        2: DataType.INT32,
-        4: DataType.INT64,
-    },
-    DataType.UINT: {
-        1: DataType.UINT16,
-        2: DataType.UINT32,
-        4: DataType.UINT64,
-    },
-    DataType.FLOAT: {
-        1: DataType.FLOAT16,
-        2: DataType.FLOAT32,
-        4: DataType.FLOAT64,
-    },
-}
 ENTRY = namedtuple("ENTRY", ["struct_id", "register_count"])
 DEFAULT_STRUCT_FORMAT = {
     DataType.INT8: ENTRY("b", 1),
@@ -81,19 +64,14 @@ def struct_validator(config: dict[str, Any]) -> dict[str, Any]:
     name = config[CONF_NAME]
     structure = config.get(CONF_STRUCTURE)
     swap_type = config.get(CONF_SWAP)
-    if data_type in (DataType.INT, DataType.UINT, DataType.FLOAT):
-        error = f"{name}  with {data_type} is not valid, trying to convert"
-        _LOGGER.warning(error)
-        try:
-            data_type = OLD_DATA_TYPES[data_type][config.get(CONF_COUNT, 1)]
-            config[CONF_DATA_TYPE] = data_type
-        except KeyError as exp:
-            error = f"{name}  cannot convert automatically {data_type}"
-            raise vol.Invalid(error) from exp
     if config[CONF_DATA_TYPE] != DataType.CUSTOM:
         if structure:
             error = f"{name}  structure: cannot be mixed with {data_type}"
             raise vol.Invalid(error)
+        if data_type not in DEFAULT_STRUCT_FORMAT:
+            error = f"Error in sensor {name}. data_type `{data_type}` not supported"
+            raise vol.Invalid(error)
+
         structure = f">{DEFAULT_STRUCT_FORMAT[data_type].struct_id}"
         if CONF_COUNT not in config:
             config[CONF_COUNT] = DEFAULT_STRUCT_FORMAT[data_type].register_count
diff --git a/tests/components/modbus/test_init.py b/tests/components/modbus/test_init.py
index b416ebad537..127389ee50f 100644
--- a/tests/components/modbus/test_init.py
+++ b/tests/components/modbus/test_init.py
@@ -176,7 +176,7 @@ async def test_ok_struct_validator(do_config):
         {
             CONF_NAME: TEST_ENTITY_NAME,
             CONF_COUNT: 8,
-            CONF_DATA_TYPE: DataType.INT,
+            CONF_DATA_TYPE: "int",
         },
         {
             CONF_NAME: TEST_ENTITY_NAME,