Mitsubishi Electric · FR-D700 Inverter
One or more units (indoor or outdoor) are still addressed at 48 or 49 (factory setting). This prevents auto-addressing, which is only possible on a single KX2 system, if one or more units (either indoor or outdoor) are not set at 49.
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Verify the address settings of all indoor and outdoor units.
Ensure that for auto-addressing on a single KX2 system, all units are initially set to address 49.