diff --git a/homeassistant/components/flexit_bacnet/climate.py b/homeassistant/components/flexit_bacnet/climate.py
index b9ae16739b9..7dc855e3106 100644
--- a/homeassistant/components/flexit_bacnet/climate.py
+++ b/homeassistant/components/flexit_bacnet/climate.py
@@ -25,6 +25,7 @@ from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 
 from .const import (
+    DOMAIN,
     MAX_TEMP,
     MIN_TEMP,
     PRESET_TO_VENTILATION_MODE_MAP,
@@ -133,7 +134,13 @@ class FlexitClimateEntity(FlexitEntity, ClimateEntity):
         try:
             await self.device.set_ventilation_mode(ventilation_mode)
         except (asyncio.exceptions.TimeoutError, ConnectionError, DecodingError) as exc:
-            raise HomeAssistantError from exc
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="set_preset_mode",
+                translation_placeholders={
+                    "preset": str(ventilation_mode),
+                },
+            ) from exc
         finally:
             await self.coordinator.async_refresh()
 
@@ -153,6 +160,12 @@ class FlexitClimateEntity(FlexitEntity, ClimateEntity):
             else:
                 await self.device.set_ventilation_mode(VENTILATION_MODE_HOME)
         except (asyncio.exceptions.TimeoutError, ConnectionError, DecodingError) as exc:
-            raise HomeAssistantError from exc
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="set_hvac_mode",
+                translation_placeholders={
+                    "mode": str(hvac_mode),
+                },
+            ) from exc
         finally:
             await self.coordinator.async_refresh()
diff --git a/homeassistant/components/flexit_bacnet/coordinator.py b/homeassistant/components/flexit_bacnet/coordinator.py
index da9415f2b87..9148ec87883 100644
--- a/homeassistant/components/flexit_bacnet/coordinator.py
+++ b/homeassistant/components/flexit_bacnet/coordinator.py
@@ -49,7 +49,11 @@ class FlexitCoordinator(DataUpdateCoordinator[FlexitBACnet]):
             await self.device.update()
         except (asyncio.exceptions.TimeoutError, ConnectionError, DecodingError) as exc:
             raise ConfigEntryNotReady(
-                f"Timeout while connecting to {self.config_entry.data[CONF_IP_ADDRESS]}"
+                translation_domain=DOMAIN,
+                translation_key="not_ready",
+                translation_placeholders={
+                    "ip": str(self.config_entry.data[CONF_IP_ADDRESS]),
+                },
             ) from exc
 
         return self.device
diff --git a/homeassistant/components/flexit_bacnet/number.py b/homeassistant/components/flexit_bacnet/number.py
index 061860e7d0d..b8c329bd1d4 100644
--- a/homeassistant/components/flexit_bacnet/number.py
+++ b/homeassistant/components/flexit_bacnet/number.py
@@ -18,6 +18,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 
+from .const import DOMAIN
 from .coordinator import FlexitConfigEntry, FlexitCoordinator
 from .entity import FlexitEntity
 
@@ -249,6 +250,12 @@ class FlexitNumber(FlexitEntity, NumberEntity):
         try:
             await set_native_value_fn(int(value))
         except (asyncio.exceptions.TimeoutError, ConnectionError, DecodingError) as exc:
-            raise HomeAssistantError from exc
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="set_value_error",
+                translation_placeholders={
+                    "value": str(value),
+                },
+            ) from exc
         finally:
             await self.coordinator.async_refresh()
diff --git a/homeassistant/components/flexit_bacnet/quality_scale.yaml b/homeassistant/components/flexit_bacnet/quality_scale.yaml
index 548580f96d3..f59435bad0d 100644
--- a/homeassistant/components/flexit_bacnet/quality_scale.yaml
+++ b/homeassistant/components/flexit_bacnet/quality_scale.yaml
@@ -62,7 +62,7 @@ rules:
     comment: |
       Device type integration.
   diagnostics: todo
-  exception-translations: todo
+  exception-translations: done
   icon-translations: done
   reconfiguration-flow: todo
   dynamic-devices:
diff --git a/homeassistant/components/flexit_bacnet/strings.json b/homeassistant/components/flexit_bacnet/strings.json
index 488d93fbd61..e9acbd46a37 100644
--- a/homeassistant/components/flexit_bacnet/strings.json
+++ b/homeassistant/components/flexit_bacnet/strings.json
@@ -119,5 +119,22 @@
         "name": "Cooker hood mode"
       }
     }
+  },
+  "exceptions": {
+    "set_value_error": {
+      "message": "Failed setting the value {value}."
+    },
+    "switch_turn": {
+      "message": "Failed to turn the switch {state}."
+    },
+    "set_preset_mode": {
+      "message": "Failed to set preset mode {preset}."
+    },
+    "set_hvac_mode": {
+      "message": "Failed to set HVAC mode {mode}."
+    },
+    "not_ready": {
+      "message": "Timeout while connecting to {ip}."
+    }
   }
 }
diff --git a/homeassistant/components/flexit_bacnet/switch.py b/homeassistant/components/flexit_bacnet/switch.py
index ac69bb86023..bdeff006181 100644
--- a/homeassistant/components/flexit_bacnet/switch.py
+++ b/homeassistant/components/flexit_bacnet/switch.py
@@ -17,6 +17,7 @@ from homeassistant.core import HomeAssistant
 from homeassistant.exceptions import HomeAssistantError
 from homeassistant.helpers.entity_platform import AddConfigEntryEntitiesCallback
 
+from .const import DOMAIN
 from .coordinator import FlexitConfigEntry, FlexitCoordinator
 from .entity import FlexitEntity
 
@@ -97,19 +98,31 @@ class FlexitSwitch(FlexitEntity, SwitchEntity):
         return self.entity_description.is_on_fn(self.coordinator.data)
 
     async def async_turn_on(self, **kwargs: Any) -> None:
-        """Turn electric heater on."""
+        """Turn switch on."""
         try:
             await self.entity_description.turn_on_fn(self.coordinator.data)
         except (asyncio.exceptions.TimeoutError, ConnectionError, DecodingError) as exc:
-            raise HomeAssistantError from exc
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="switch_turn",
+                translation_placeholders={
+                    "state": "on",
+                },
+            ) from exc
         finally:
             await self.coordinator.async_refresh()
 
     async def async_turn_off(self, **kwargs: Any) -> None:
-        """Turn electric heater off."""
+        """Turn switch off."""
         try:
             await self.entity_description.turn_off_fn(self.coordinator.data)
         except (asyncio.exceptions.TimeoutError, ConnectionError, DecodingError) as exc:
-            raise HomeAssistantError from exc
+            raise HomeAssistantError(
+                translation_domain=DOMAIN,
+                translation_key="switch_turn",
+                translation_placeholders={
+                    "state": "off",
+                },
+            ) from exc
         finally:
             await self.coordinator.async_refresh()