No Applied Unit

What does FFFF mean?

The 'FFFF' display indicates that the system does not detect any applied or connected units (either indoor or outdoor). This suggests a unit might not be properly connected or is not receiving power.

1. 1

   Verify that all indoor and outdoor units are correctly connected to the system's communication and power lines.

2. 2

   Ensure that all connected units are powered on and receiving adequate electrical supply.

3. 3

   Check the address settings of all connected units to confirm they are configured correctly within the system.