B0 / Eb0
Estimated airflow from indoor subsystem is near 0 CFM
This code typically points to
- Failed indoor blower motor
- Indoor fan motor not properly connected
- Too much static pressure
Next checks to confirm
- Check indoor-fan motor wiring/connectors
- Replace indoor-fan motor if needed
- Check obstruction inside ductwork
Escalation
Indoor airflow failure affecting outdoor operation
Reset behavior
Clears after indoor airflow path is restored.
Urgent
Fix now