Handle Daikin connection errors gracefully in coordinator

homeassistant/components/daikin/coordinator.py

@@ -4,10 +4,11 @@
 import logging
 
 from pydaikin.daikin_base import Appliance
+from pydaikin.exceptions import DaikinException
 
 from homeassistant.config_entries import ConfigEntry
 from homeassistant.core import HomeAssistant
-from homeassistant.helpers.update_coordinator import DataUpdateCoordinator
+from homeassistant.helpers.update_coordinator import DataUpdateCoordinator, UpdateFailed
 
 from .const import DOMAIN, TIMEOUT_SEC
 
@@ -33,4 +34,11 @@ def __init__(
         self.device = device
 
     async def _async_update_data(self) -> None:
-        await self.device.update_status()
+        try:
+            await self.device.update_status()
+        except DaikinException as err:
+            raise UpdateFailed(
+                translation_domain=DOMAIN,
+                translation_key="error_communicating",
+                translation_placeholders={"error": str(err)},
+            ) from err

homeassistant/components/daikin/strings.json

@@ -59,6 +59,9 @@
     }
   },
   "exceptions": {
+    "error_communicating": {
+      "message": "Error communicating with Daikin device: {error}"
+    },
     "zone_hvac_mode_unsupported": {
       "message": "Zone temperature can only be changed when the main climate mode is heat or cool."
     },