Handle Daikin connection errors gracefully in coordinator

[frenck]

Proposed change

When a Daikin device is powered off or unreachable, update_status() raises DaikinException which propagates as an unhandled exception. The coordinator logs a full traceback every polling interval (~83 seconds), flooding the logs indefinitely until the device comes back online.

The fix catches DaikinException and raises UpdateFailed with a translated error message. The coordinator then handles this gracefully: marks the entity as unavailable, logs at debug level, and retries on the next interval without log spam.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes Daikin integration fills log with errors when device powered off #125752
• This PR is related to issue:
• Link to documentation pull request:
• Link to developer documentation pull request:
• Link to frontend pull request:

Checklist

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[home-assistant]

Hey there @fredrike, mind taking a look at this pull request as it has been labeled with an integration (daikin) you are listed as a code owner for? Thanks!

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[Copilot]

Pull request overview

Catches DaikinException from pydaikin's update_status() in the coordinator and re-raises as a translated UpdateFailed, so the coordinator marks entities unavailable and stops emitting tracebacks every poll when a Daikin device is unreachable.

Changes:

• Wrap update_status() in a try/except DaikinException and raise UpdateFailed with a translation key.
• Add a new error_communicating exception message to strings.json.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
homeassistant/components/daikin/coordinator.py	Catch DaikinException and convert to translated UpdateFailed.
homeassistant/components/daikin/strings.json	Add error_communicating exception message used by the coordinator.