diff --git a/homeassistant/components/modbus/binary_sensor.py b/homeassistant/components/modbus/binary_sensor.py
index 979888d0a198..d04938c929ad 100644
--- a/homeassistant/components/modbus/binary_sensor.py
+++ b/homeassistant/components/modbus/binary_sensor.py
@@ -35,7 +35,6 @@ from .const import (
     DEFAULT_SCAN_INTERVAL,
     MODBUS_DOMAIN,
 )
-from .modbus import ModbusHub
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -84,14 +83,12 @@ async def async_setup_platform(
             CONF_NAME: "no name",
             CONF_BINARY_SENSORS: config[CONF_INPUTS],
         }
-        config = None
 
     for entry in discovery_info[CONF_BINARY_SENSORS]:
         if CONF_HUB in entry:
-            # from old config!
-            hub: ModbusHub = hass.data[MODBUS_DOMAIN][entry[CONF_HUB]]
+            hub = hass.data[MODBUS_DOMAIN][entry[CONF_HUB]]
         else:
-            hub: ModbusHub = hass.data[MODBUS_DOMAIN][discovery_info[CONF_NAME]]
+            hub = hass.data[MODBUS_DOMAIN][discovery_info[CONF_NAME]]
         if CONF_SCAN_INTERVAL not in entry:
             entry[CONF_SCAN_INTERVAL] = DEFAULT_SCAN_INTERVAL
         sensors.append(
diff --git a/homeassistant/components/modbus/climate.py b/homeassistant/components/modbus/climate.py
index d98cda3ed437..cc8f74577c78 100644
--- a/homeassistant/components/modbus/climate.py
+++ b/homeassistant/components/modbus/climate.py
@@ -242,7 +242,7 @@ class ModbusThermostat(ClimateEntity):
             )
         if result is None:
             self._available = False
-            return
+            return -1
 
         byte_string = b"".join(
             [x.to_bytes(2, byteorder="big") for x in result.registers]
@@ -255,11 +255,11 @@ class ModbusThermostat(ClimateEntity):
             )
             return -1
 
-        val = val[0]
+        val2 = val[0]
         register_value = format(
-            (self._scale * val) + self._offset, f".{self._precision}f"
+            (self._scale * val2) + self._offset, f".{self._precision}f"
         )
-        register_value = float(register_value)
+        register_value2 = float(register_value)
         self._available = True
 
-        return register_value
+        return register_value2
diff --git a/homeassistant/components/modbus/sensor.py b/homeassistant/components/modbus/sensor.py
index c1a33c41f6d3..91f80864f73b 100644
--- a/homeassistant/components/modbus/sensor.py
+++ b/homeassistant/components/modbus/sensor.py
@@ -58,7 +58,6 @@ from .const import (
     DEFAULT_STRUCT_FORMAT,
     MODBUS_DOMAIN,
 )
-from .modbus import ModbusHub
 
 _LOGGER = logging.getLogger(__name__)
 
@@ -120,7 +119,6 @@ async def async_setup_platform(
             entry[CONF_INPUT_TYPE] = entry[CONF_REGISTER_TYPE]
             del entry[CONF_REGISTER]
             del entry[CONF_REGISTER_TYPE]
-        config = None
 
     for entry in discovery_info[CONF_SENSORS]:
         if entry[CONF_DATA_TYPE] == DATA_TYPE_STRING:
@@ -175,9 +173,9 @@ async def async_setup_platform(
                 continue
         if CONF_HUB in entry:
             # from old config!
-            hub: ModbusHub = hass.data[MODBUS_DOMAIN][entry[CONF_HUB]]
+            hub = hass.data[MODBUS_DOMAIN][entry[CONF_HUB]]
         else:
-            hub: ModbusHub = hass.data[MODBUS_DOMAIN][discovery_info[CONF_NAME]]
+            hub = hass.data[MODBUS_DOMAIN][discovery_info[CONF_NAME]]
         if CONF_SCAN_INTERVAL not in entry:
             entry[CONF_SCAN_INTERVAL] = DEFAULT_SCAN_INTERVAL
         sensors.append(
diff --git a/mypy.ini b/mypy.ini
index 30fe27177a6c..42e5c0101f2c 100644
--- a/mypy.ini
+++ b/mypy.ini
@@ -993,9 +993,6 @@ ignore_errors = true
 [mypy-homeassistant.components.mobile_app.*]
 ignore_errors = true
 
-[mypy-homeassistant.components.modbus.*]
-ignore_errors = true
-
 [mypy-homeassistant.components.motion_blinds.*]
 ignore_errors = true
 
diff --git a/script/hassfest/mypy_config.py b/script/hassfest/mypy_config.py
index 05763fb65179..a840723b20e5 100644
--- a/script/hassfest/mypy_config.py
+++ b/script/hassfest/mypy_config.py
@@ -134,7 +134,6 @@ IGNORED_MODULES: Final[list[str]] = [
     "homeassistant.components.metoffice.*",
     "homeassistant.components.minecraft_server.*",
     "homeassistant.components.mobile_app.*",
-    "homeassistant.components.modbus.*",
     "homeassistant.components.motion_blinds.*",
     "homeassistant.components.motioneye.*",
     "homeassistant.components.mqtt.*",