Make ComfoAir error codes visible as sensors in Home Assistant

[catgiggle]

Context / Problem:

The ComfoAir integration defines error codes in [aiocomfoconnect/const.py](https://github.com/michaelarnauts/aiocomfoconnect/blob/master/aiocomfoconnect/const.py) such as EXT_PRESSURE_SUP. These errors are currently only logged in Home Assistant logs.

Example log entry:

Supply air pressure too high. Check air outlets, ducts and filters for pollution and obstructions. Check valve settings. (EXT_PRESSURE_SUP ERROR)

On the ComfoSwitch device, a red LED indicates that something is wrong, but in the integration I cannot detect or see these errors. My current sensor.comfoairq_airflow_constraint (state=NoiseGuard) does not reflect these error states.

I am not sure whether this should be considered a bug or a feature request, but (in my opinion) currently there is no way to react to these errors or display them on dashboards in Home Assistant.

Proposed solution / Request:

One possibility could be to expose these errors as a dedicated sensor, e.g.:

• sensor.comfoairq_status or sensor.comfoairq_error
• state could indicate the error code (EXT_PRESSURE_SUP, EXT_PRESSURE_EX, etc.)
• attributes could include the detailed description of the error, e.g., "Supply air pressure too high. Check air outlets, ducts and filters for pollution and obstructions. Check valve settings."

This would allow:

• Displaying errors on Home Assistant dashboards
• Triggering automations based on error states

Questions / Request for guidance:

• Is there currently any workaround to expose these errors in Home Assistant?
• Would it make sense to create a new sensor for this, or should the existing sensor.comfoairq_airflow_constraint be extended?
• Perhaps this is actually a bug and these errors should be part of the airflow_constraint sensor?