diff --git a/homeassistant/components/modbus/binary_sensor.py b/homeassistant/components/modbus/binary_sensor.py
index 3dabeee081c..39174ae8931 100644
--- a/homeassistant/components/modbus/binary_sensor.py
+++ b/homeassistant/components/modbus/binary_sensor.py
@@ -122,10 +122,7 @@ class ModbusBinarySensor(BasePlatform, RestoreEntity, BinarySensorEntity):
                 self._result = result.bits
             else:
                 self._result = result.registers
-            if len(self._result) >= 1:
-                self._attr_is_on = bool(self._result[0] & 1)
-            else:
-                self._attr_available = False
+            self._attr_is_on = bool(self._result[0] & 1)
 
         self.async_write_ha_state()
         if self._coordinator:
diff --git a/homeassistant/components/modbus/climate.py b/homeassistant/components/modbus/climate.py
index 3acf8d7ac29..df2983e9070 100644
--- a/homeassistant/components/modbus/climate.py
+++ b/homeassistant/components/modbus/climate.py
@@ -247,10 +247,6 @@ class ModbusThermostat(BaseStructPlatform, RestoreEntity, ClimateEntity):
         # remark "now" is a dummy parameter to avoid problems with
         # async_track_time_interval
 
-        # do not allow multiple active calls to the same platform
-        if self._call_active:
-            return
-        self._call_active = True
         self._attr_target_temperature = await self._async_read_register(
             CALL_TYPE_REGISTER_HOLDING, self._target_temperature_register
         )
@@ -282,7 +278,6 @@ class ModbusThermostat(BaseStructPlatform, RestoreEntity, ClimateEntity):
             if onoff == 0:
                 self._attr_hvac_mode = HVACMode.OFF
 
-        self._call_active = False
         self.async_write_ha_state()
 
     async def _async_read_register(
diff --git a/homeassistant/components/modbus/cover.py b/homeassistant/components/modbus/cover.py
index 3c4247c61fb..27f9cb1fc18 100644
--- a/homeassistant/components/modbus/cover.py
+++ b/homeassistant/components/modbus/cover.py
@@ -138,14 +138,9 @@ class ModbusCover(BasePlatform, CoverEntity, RestoreEntity):
         """Update the state of the cover."""
         # remark "now" is a dummy parameter to avoid problems with
         # async_track_time_interval
-        # do not allow multiple active calls to the same platform
-        if self._call_active:
-            return
-        self._call_active = True
         result = await self._hub.async_pb_call(
             self._slave, self._address, 1, self._input_type
         )
-        self._call_active = False
         if result is None:
             if self._lazy_errors:
                 self._lazy_errors -= 1
diff --git a/homeassistant/components/modbus/modbus.py b/homeassistant/components/modbus/modbus.py
index 31179a23583..db8a4d47fdc 100644
--- a/homeassistant/components/modbus/modbus.py
+++ b/homeassistant/components/modbus/modbus.py
@@ -261,7 +261,7 @@ class ModbusHub:
         """Initialize the Modbus hub."""
 
         if CONF_CLOSE_COMM_ON_ERROR in client_config:
-            async_create_issue(  # pragma: no cover
+            async_create_issue(
                 hass,
                 DOMAIN,
                 "deprecated_close_comm_config",