D2 / Ed2
Airflow requirement is greater than the airflow capability of the indoor subsystem
This code typically points to
- Outdoor unit requires greater airflow than indoor capability or type of indoor unit with EEV is connected
- Shared data incompatible with system or missing parameters
- Communication wiring with indoor unit has loose connection
Next checks to confirm
- Check combination against rating list and correct if needed
- Verify shared data for specific model and repopulate if required
- Check communication and power-supply wiring of indoor unit and repair as needed
Escalation
System match/airflow capability fault
Reset behavior
Clears after proper indoor/outdoor match/data/wiring is restored.
Urgent
Fix now