E12 - Address setting conflict or auto address failure

What does E12 mean?

This error occurs when one or more units (indoor or outdoor) have address settings at factory defaults (48 or 49) or when auto-addressing fails on a non-KX2 system.

• Indoor or outdoor units left at factory default addresses (48 or 49).
• Attempting auto-addressing on a system that does not support it (only KX2 systems).
• Conflict in address settings across units.

Click steps to track your progress.

1. 1

   Turn off the main power to all units in the system at the circuit breaker.

2. 2

   Consult the installation manual to manually set unique addresses for each indoor and outdoor unit, ensuring no unit is left at the factory default (48 or 49).

3. 3

   If using auto-addressing, verify that your system is a KX2 model, as it's the only one supported.

4. 4

   Restore power and re-attempt addressing if necessary. If issues persist, contact a professional.