D1 / Ed1
Control board does not have the appropriate data needed to properly perform its functions
This code typically points to
- Outdoor unit is wired as part of a communicating system
- Invalid shared data or network data is invalid for the integrated control module
Next checks to confirm
- Replace control board if necessary
Escalation
Communicating setup/data fault
Reset behavior
Clears after proper data/control condition is restored.
Urgent
Fix now